memory alignment issue that only occurs with specific buffer sizes (image dimensions) and results in leaks

[CetinSert]

In a project compiled with emscripten (em++) to WASM, calls to a function with some image dimensions keep triggering

  memalign memset free
  memalign memset free
  memalign memset

repeatedly on every function call. When the function eventually returns a memory reference, this works as expected when probed with image-related functions for height, width, etc. BUT it cannot be deallocated and leak completely.

Other image dimensions both work and deallocate just fine; calling the function with such good dimensions do NOT keep triggering the above memalign ⋯ repeatedly.

The behavior persists across

• multiple browsers: Chrome 91.0.4472.77, Firefox 89.0
• multiple versions of the compiled project: 4505, 4542, 4543
• multiple versions of emscripten: 2.0.20, 2.0.24
  paulocoutinhox/pdfium-lib@d4a08e8#diff-120a286a77ddf1bc450cb5703c08c05422275bc73616e5a359eb245ec9a923bdL68

---

Please

• see the attached screenshot first, under the Single-line Reproduction section right below
• and toggle open the collapsed sections marked with 👉🏻👈🏻 for details.

Investigation Details 🕵🏻‍♂️

paulocoutinhox/pdfium-lib#33 (comment)
paulo-coutinho/pdfium-lib/blob/master/modules/wasm.py (how the project uses emscripten)

Single-line Reproduction 🔬

1. Go to https://pdfviewer.github.io/
2. Open developer console F12
3. Evaluate the following in the console:

_PDFium_Init();

4. Evaluate the following line several times and watch the memory grow:

var w = 496, h = 496; for (let i = 0; i < 5; i++) _FPDFBitmap_Destroy(FPDF.Bitmap_CreateEx(w, h, 4)); [ wasmMemory, wasmMemory.buffer.byteLength ] // ❌

👉🏻 496 × 496 × 4 ❌ memalign ⋯ trigger on each iteration 👈🏻 (CLICK/TAP HERE TO REVIEW EXECUTION)

  CreateEx
    memalign memset free
    memalign memset free
    memalign memset
  Destroy

  CreateEx
    memalign memset free
    memalign memset free
    memalign memset
  Destroy

  CreateEx
    memalign memset free
    memalign memset free
    memalign memset
  Destroy

  CreateEx
    memalign memset free
    memalign memset free
    memalign memset
  Destroy

  CreateEx
    memalign memset free
    memalign memset free
    memalign memset
  Destroy

5. Note that this one is totally fine and does not leak:

var w = 495, h = 495; for (let i = 0; i < 5; i++) _FPDFBitmap_Destroy(FPDF.Bitmap_CreateEx(w, h, 4)); [ wasmMemory, wasmMemory.buffer.byteLength ] // ✔️

👉🏻 496 × 496 × 4 ✔️ memalign ⋯ trigger only once 👈🏻 (CLICK/TAP HERE TO REVIEW EXECUTION)

  CreateEx
    memalign memset free
    memalign memset free
    memalign memset
  Destroy

  CreateEx
  Destroy

  CreateEx
  Destroy

  CreateEx
  Destroy

  CreateEx
  Destroy

---

I kindly ask emscripten experts for their help in finding how to compile the said project in a way that resolves this issue.

Investigation Details 🕵🏻‍♂️

paulocoutinhox/pdfium-lib#33 (comment)
paulo-coutinho/pdfium-lib/blob/master/modules/wasm.py (how the project uses emscripten)

FPDFBitmap_CreateEx call tree

• FPDFBitmap_CreateEx – https://pdfium.googlesource.com/pdfium/+/refs/heads/chromium/4542/fpdfsdk/fpdf_view.cpp#799
  • pdfium::MakeRetain – https://pdfium.googlesource.com/pdfium/+/refs/heads/chromium/4542/core/fxcrt/retain_ptr.h#174
  • CFX_DIBitmap::Create – https://pdfium.googlesource.com/pdfium/+/refs/heads/chromium/4542/core/fxge/dib/cfx_dibitmap.cpp#27
    • FX_TryAlloc – https://pdfium.googlesource.com/pdfium/+/refs/heads/chromium/4542/core/fxcrt/fx_memory.h#48
      • Calloc – https://pdfium.googlesource.com/pdfium/+/refs/heads/chromium/4542/core/fxcrt/fx_memory.cpp#109
        • PartitionAllocGenericFlags – https://pdfium.googlesource.com/pdfium/+/refs/heads/chromium/4542/third_party/base/allocator/partition_allocator/partition_alloc.h#394
        • PartitionAllocatorGeneric – https://pdfium.googlesource.com/pdfium/+/refs/heads/chromium/4542/third_party/base/allocator/partition_allocator/partition_alloc.h#517

[kripken]

To investigate this, the first thing I'd do is find out if this is fragmentation or leaking. Fragmentation may be caused when doing many allocations and frees, after which it cannot find contiguous chunks and so ends up growing the total size of memory. dlmalloc mentions that aligned memory may be more vulnerable to that,

emscripten/system/lib/dlmalloc.c

Line 971 in 3205328

Overreliance on memalign is a sure way to fragment space.

To verify that, I'd instrument malloc, memalign, and free (and also realloc etc. if used). Just counting the bytes allocated and freed. One way to instrument it is to compile with WASM=0 and add some code in JS. Or, use mallinfo(), see https://emscripten.org/docs/porting/Debugging.html#memory (the memory profiler mentioned there can also help).

If you find that the codebase you are compiling allocates more than it frees, then it would be a leak in the code. If instead it frees everything it allocates, then I'd guess the problem is fragmentation.

If it is fragmentation in fact, then the codebase might benefit from reusing buffers, using an arena, etc.

[CetinSert]

@kripken – can increasing the wasmMemory page size from 64KB to something higher also help with fragmentation?

I will answer myself: this is not even possible as 64KB is a constant – https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Memory/Memory#parameters.

[CetinSert]

To verify that, I'd instrument malloc, memalign, and free (and also realloc etc. if used). Just counting the bytes allocated and freed. One way to instrument it is to compile with WASM=0 ...

Instrumentation seemed easy even without WASM=0.

(() => {
  const ins = (f, n) => (...a) => { const v = f(...a); console.warn(n, f, v, '<-', a); return v; };
  const { malloc, memalign, memset, free, realloc } = Module.asm;
  Module.asm = { ...Module.asm,
    malloc:   ins(malloc,   'malloc  '),
    memalign: ins(memalign, 'memalign'),
    memset:   ins(memset,   'memset  '),
    free:     ins(free,     'free    '),
    realloc:  ins(realloc,  'realloc ')
  };
})();

but the instrumented functions only get called when the now infamous memalign ⋯ trio triggers. So we get limited improved vision.

[CetinSert]

@kripken – updated the original issue with more data from the instrumentation (which does trigger repeatedly on every time as it is a new known bad case and bad cases trigger the memalign ⋯ pattern in a way (at a layer) that also triggers the instrumentation), please take a look at the new comment linked below to see if it reminds you of any pattern you or other developers of emscripten recognize.

paulocoutinhox/pdfium-lib#33 (comment)

[kripken]

Instrumenting Module.asm like that will just affect calls that go through JS. Direct calls inside the wasm would not be noticed.

If that is not a problem, then the logging does show a leak in the codebase, as there is no free for the third memalign. To investigate that you could get a stack trace for that allocation, then try to figure out where the free should be, etc.

[CetinSert]

If it is fragmentation in fact, then the codebase might benefit from reusing buffers, using an arena, etc.

I assume there is no way to compact / vacuum the memory.

To investigate that you could get a stack trace for that allocation, then try to figure out where the free should be, etc.

1. Is there a compile/run-time option to reduce/eliminate these memalign ⋯ calls to test if codebase still works?
2. What would do a memalign(65535, ⋯)? Should 65535 not be a small number that is more like 4 because WASM is 32-bit?
3. Get a stack trace in JS or C++ or via an emscripten compilation option?
   (I have not compiled this module myself, have been treating it as a blackbox so far.)

[CetinSert]

If that is not a problem, then the logging does show a leak in the codebase, as there is no free for the third memalign. To investigate that you could get a stack trace for that allocation, then try to figure out where the free should be, etc.

The original C++ codebase was checked and found to not suffer from memory leaks:

• https://bugs.chromium.org/p/pdfium/issues/detail?id=1692 (reported to Google)
• https://pdfium-review.googlesource.com/c/pdfium/+/82111/1/fpdfsdk/fpdf_view_embeddertest.cpp (Google tested)
• Bitmaps larger than 495 × 495 × 4 leak in WASM paulocoutinhox/pdfium-lib#33 (comment) (also, self-confirmed in C++)

---

Here is how em++ is being called: https://github.com/paulo-coutinho/pdfium-lib/blob/c95bc4a72502251bd3ee770d57907812945c6a2d/modules/wasm.py#L674.

Here is how the WASM builds are being made by the repository owner.

PDFium build steps 👈🏻 (dockerized short version)

Docker

You can use docker to build and test on local machine before deploy.

Build the image with command:

docker build -t pdfium-wasm -f docker/wasm/Dockerfile docker/wasm

Test with command:

docker run -v ${PWD}:/app -it pdfium-wasm echo "test"

Now you can execute any command with pattern:

docker run -v ${PWD}:/app -it pdfium-wasm [COMMAND]

Obs: This is the recommended way to build and is used on CD server.

Run on browser

You can test the sample using commands:

⋮

docker run -v ${PWD}:/app -it pdfium-wasm python3 make.py run test-wasm
python3 -m http.server --directory sample-wasm/build

Run on terminal

You can test the sample using commands:

⋮

docker run -v ${PWD}:/app -it pdfium-wasm python3 make.py run test-wasm
docker run -v ${PWD}:/app -it pdfium-wasm node sample-wasm/build/index.js

Web demo

You can test pdfium on web browser here:

https://pdfviewer.github.io/

---

References Quoted

1. https://github.com/paulo-coutinho/pdfium-lib/blob/master/README.md
2. https://github.com/paulo-coutinho/pdfium-lib/blob/master/docs/BUILD_WASM.md

[CetinSert]

Further improved the instrumentation in paulocoutinhox/pdfium-lib#33 (comment) to keep counts and added screenshots.

(() => {

  M = new Map();
  M.sum = () => [...M.values()].reduce((a, c) => a + c, 0);
  M.cnt = { malloc: 0, free: 0, sum: 0 };
  M.fn  = { malloc: 0, memalign: 1 };
  M.add = (n, a) => { M.   set(a, n); M.cnt.malloc++; M.cnt.sum += n; };
  M.sub =     a  => { M.delete(a   ); M.cnt.free++;                   };

  const ins = (f, n) => (...a) => {
    const v =  f(...a), d = a[M.fn[n]] ?? 0;
    if (d   >      0) M.add(d, v);
    if (n === 'free') M.sub(a[0]);
    console.warn(n.padEnd(8), f, `${v}`.padStart(20), '<-', (a.length == 1 ? [...a, '-'] : a).map(a => `${a}`.padStart(20)).join(' '), '|', `${wasmMemory.buffer.byteLength}`.padStart(20), '|', `${M.sum()}`.padStart(20), 'M', M.size); return v;
  };

  const { malloc, memalign, memset, free, realloc } = Module.asm;
  Module.asm = { ...Module.asm,
    malloc:   ins(malloc,   'malloc'),
    memalign: ins(memalign, 'memalign'/*.length == 8*/),
  //memset:   ins(memset,   'memset'),
    free:     ins(free,     'free'),
    realloc:  ins(realloc,  'realloc')
  };

})();

1. Why would/might only some arguments to Bitmap_CreateEx cause repeated memalign ⋯ calls?
   After testing again, it does indeed seem that going beyond 495 × 495 × 4 triggers memalign ⋯ reliably.
   So, size seems to play a role here but why?
2. The Bitmap_Destroy(Bitmap_CreateEx(⋯)) calls were tested in C++ by me and Google as linked above and were found to not leak in that environment at any size. (see memory alignment issue that only occurs with specific buffer sizes (image dimensions) and results in leaks #14459 (comment))
3. Is em++ generating/placing the memalign ⋯ calls into the compiled WASM binary?
4. How can we avoid these? Can we re-compile in a different way, with a different configuration / flags to avoid them?
   I have noticed we are building with -O3 on which the manual page of em++ reads

       -O3    As -O2, plus dangerous optimizations that may break the generated
              code! This adds

              -s FORCE_ALIGNED_MEMORY=1 -s DOUBLE_MODE=0 -s PRECISE_I64_MATH=0
              --closure 1 --llvm-lto 1

              This is not recommended at all. A better idea is to try each of
              these separately on top of -O2 to see what works. See the wiki and
              src/settings.js (for the -s options) for more information.

---

Testing with -O2 seems to not help. Re-confirming with an independent build soon ...

[kripken]

I assume there is no way to compact / vacuum the memory.

Correct. That is a general issue with languages using linear memory. On native platforms this is also a problem, mostly on 32-bit (as on 64-bit virtual memory can be used to work around it).

You can get a stack trace programmatically by console.log(new Error().stack) for example. Or you can get a trace running in the debugger.

em++ may call memalign in some cases for internal reasons (like if you call mmap). The stack trace should help figure that out.

[CetinSert]

You can get a stack trace programmatically by console.log(new Error().stack) for example. Or you can get a trace running in the debugger.

Here is the stack trace.

[kripken]

Thanks, ok, then the allocation happens here in mmap:

emscripten/src/library_syscall.js

Line 248 in 7192647

ptr = _memalign({{{ WASM_PAGE_SIZE }}}, len);

and the free should happen here in munmap:

emscripten/src/library_syscall.js

Line 302 in 7192647

_free(info.malloc);

I don't see anything obviously wrong there, and in our test suite the tests pass (and I verified we check that free is called on the right pointer).

Is it possible the codebase you are compiling does not call munmap on what it mmaps?

[CetinSert]

Is it possible the codebase you are compiling does not call munmap on what it mmaps?

checking now ... (as a note, other target / compiler pairs have no such issues as tested twice here: #14459 (comment))

---

I have also tried other mallocs emscripten ships with ... nothing helped there either. (TODO: add data)

Also tried all sanitizer, debug options and the only leaks that get detected is when we run out of 2GB WASM memory a mere 48 bytes (TODO: add data).

[CetinSert]

Is it possible the codebase you are compiling does not call munmap on what it mmaps?

Found the culprit I believe:

1. No, the codebase clearly calls munmap on what it mmaps ✔️ (see below)
2. munmap sometimes (with a regular pattern) fails to call free ❌ (see below)
   
   💡
   This turned out to be because munmap is getting called with a shorter length than how much was mmaped to that address.
   This was discovered further below in this separate comment: memory alignment issue that only occurs with specific buffer sizes (image dimensions) and results in leaks #14459 (comment) .

---

Immediate Reproduction Link

Please review this link where I have done a lot to get as much ready-to-see info out as possible!

https://pdf.ist/em/14459/ (ready to produce the below screenshot)

• instrumentation pre-applied
• compiled with debugging options

1. navigate to https://pdf.ist/em/14459/
2. open the developer console (F12)
3. evaluate the following one line at a time in the developer console
   
   (This will reproduce the exact Screenshot of the Issue below,
   which I have also annotated here with ✔️ ❌ marks for your convenience.)

1 time

_PDFium_Init(); clear();

3 times

_PDFium_Init(); var w = 496, h = 496; for (let i = 0; i < 1; i++) _FPDFBitmap_Destroy(_FPDFBitmap_CreateEx(w, h, 4)); [ wasmMemory, wasmMemory.buffer.byteLength ] // ❌

Screenshot of the Issue

✔️ munmap calls free
✔️ munmap calls free
❌ munmap does not call free

Is it possible the codebase you are compiling does not call munmap on what it mmaps?

No, at all 3 times, munmap is called with the output from mmap (visible in the screenshot).

👉🏻 instrumentation code 👈🏻

(() => {

  M = new Map();
  M.sum = () => [...M.values()].reduce((a, c) => a + c, 0);
  M.cnt = { malloc: 0, free: 0, sum: 0 };
  M.fn  = { malloc: 0, memalign: 1 };
  M.add = (n, a) => { M.   set(a, n); M.cnt.malloc++; M.cnt.sum += n; };
  M.sub =     a  => { M.delete(a   ); M.cnt.free++;                   };

  const ins = (f, n) => (...a) => {
    const v =  f(...a), d = a[M.fn[n]] ?? 0;
    if (d   >      0) M.add(d, v);
    if (n === 'free') M.sub(a[0]);
    console.warn(n.padEnd(8), f, `${v}`.padStart(20), '<-', (a.length == 1 ? [...a, '-'] : a).map(a => `${a}`.padStart(20)).join(' '), '|', `${wasmMemory.buffer.byteLength}`.padStart(20), '|', `${M.sum()}`.padStart(20), 'M', M.size); return v;
  };

  const { malloc, memalign, memset, free, realloc } = Module.asm;
  Module.asm = { ...Module.asm,
    malloc:   ins(malloc,   'malloc'),
    memalign: ins(memalign, 'memalign'/*.length == 8*/),
  //memset:   ins(memset,   'memset'),
    free:     ins(free,     'free'),
    realloc:  ins(realloc,  'realloc')
  };

})();

👉🏻 instrumentation output legend 👈🏻

function        ⋯    return    arguments                                        wasmMemory         tracked memory   L
=============== ⋯ =========    =========================================   ===============   ====================   =
malloc   ƒ 4497 ⋯  16584728 <-                   16                    - |        44040192 |                   16 M 1
free     ƒ 4498 ⋯ undefined <-             16584728                    - |        44040192 |                    0 M 0

👉🏻 console output copy / paste 👈🏻

pdfium.js?v=4543:4924 syscall! __sys_mmap2: [0,1007616,3,34,-1,0]
___sys_mmap2 @ pdfium.js?v=4543:4924
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.729 VM1972:14 memalign ƒ 8416() { [native code] }            339804160 <-                65536              1007616 |           1073741824 |              1007616 M 1
(anonymous) @ VM1972:14
(anonymous) @ pdfium.js?v=4543:1222
syscallMmap2 @ pdfium.js?v=4543:4900
(anonymous) @ pdfium.js?v=4543:4928
___sys_mmap2 @ pdfium.js?v=4543:4935
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.729 pdfium.js?v=4543:4939 syscall return: 339804160
___sys_mmap2 @ pdfium.js?v=4543:4939
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.729 pdfium.js?v=4543:4979 syscall! __sys_munmap: [339804160,1007616]
___sys_munmap @ pdfium.js?v=4543:4979
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.730 VM1972:14 free     ƒ 8409() { [native code] }            undefined <-            339804160                    - |           1073741824 |                    0 M 0
(anonymous) @ VM1972:14
(anonymous) @ pdfium.js?v=4543:1222
syscallMunmap @ pdfium.js?v=4543:4972
(anonymous) @ pdfium.js?v=4543:4983
___sys_munmap @ pdfium.js?v=4543:4990
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.730 pdfium.js?v=4543:4994 syscall return: 0
___sys_munmap @ pdfium.js?v=4543:4994
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.730 pdfium.js?v=4543:4924 syscall! __sys_mmap2: [341835776,1007616,3,34,-1,0]
___sys_mmap2 @ pdfium.js?v=4543:4924
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.731 VM1972:14 memalign ƒ 8416() { [native code] }            341114880 <-                65536              1007616 |           1073741824 |              1007616 M 1
(anonymous) @ VM1972:14
(anonymous) @ pdfium.js?v=4543:1222
syscallMmap2 @ pdfium.js?v=4543:4900
(anonymous) @ pdfium.js?v=4543:4928
___sys_mmap2 @ pdfium.js?v=4543:4935
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.731 pdfium.js?v=4543:4939 syscall return: 341114880
___sys_mmap2 @ pdfium.js?v=4543:4939
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.731 pdfium.js?v=4543:4979 syscall! __sys_munmap: [341114880,1007616]
___sys_munmap @ pdfium.js?v=4543:4979
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.731 VM1972:14 free     ƒ 8409() { [native code] }            undefined <-            341114880                    - |           1073741824 |                    0 M 0
(anonymous) @ VM1972:14
(anonymous) @ pdfium.js?v=4543:1222
syscallMunmap @ pdfium.js?v=4543:4972
(anonymous) @ pdfium.js?v=4543:4983
___sys_munmap @ pdfium.js?v=4543:4990
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.731 pdfium.js?v=4543:4994 syscall return: 0
___sys_munmap @ pdfium.js?v=4543:4994
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.731 pdfium.js?v=4543:4924 syscall! __sys_mmap2: [0,3100672,3,34,-1,0]
___sys_mmap2 @ pdfium.js?v=4543:4924
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.733 VM1972:14 memalign ƒ 8416() { [native code] }            342425600 <-                65536              3100672 |           1073741824 |              3100672 M 1
(anonymous) @ VM1972:14
(anonymous) @ pdfium.js?v=4543:1222
syscallMmap2 @ pdfium.js?v=4543:4900
(anonymous) @ pdfium.js?v=4543:4928
___sys_mmap2 @ pdfium.js?v=4543:4935
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.733 pdfium.js?v=4543:4939 syscall return: 342425600
___sys_mmap2 @ pdfium.js?v=4543:4939
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.733 pdfium.js?v=4543:4979 syscall! __sys_munmap: [342425600,1507328]
___sys_munmap @ pdfium.js?v=4543:4979
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.733 pdfium.js?v=4543:4994 syscall return: 0
___sys_munmap @ pdfium.js?v=4543:4994
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.733 pdfium.js?v=4543:4979 syscall! __sys_munmap: [344940544,585728]
___sys_munmap @ pdfium.js?v=4543:4979
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.733 pdfium.js?v=4543:4994 syscall return: 0
___sys_munmap @ pdfium.js?v=4543:4994
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.734 pdfium.js?v=4543:4944 syscall! __sys_mprotect: [343932928,65536,0]
___sys_mprotect @ pdfium.js?v=4543:4944
__mprotect @ mprotect.c:10
pdfium::base::SetSystemPagesAccess(void*, unsigned long, pdfium::base::PageAccessibilityConfiguration) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.734 pdfium.js?v=4543:4952 syscall return: 0
___sys_mprotect @ pdfium.js?v=4543:4952
__mprotect @ mprotect.c:10
pdfium::base::SetSystemPagesAccess(void*, unsigned long, pdfium::base::PageAccessibilityConfiguration) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.734 pdfium.js?v=4543:4944 syscall! __sys_mprotect: [343932928,65536,0]
___sys_mprotect @ pdfium.js?v=4543:4944
__mprotect @ mprotect.c:10
pdfium::base::SetSystemPagesAccess(void*, unsigned long, pdfium::base::PageAccessibilityConfiguration) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.734 pdfium.js?v=4543:4952 syscall return: 0
___sys_mprotect @ pdfium.js?v=4543:4952
__mprotect @ mprotect.c:10
pdfium::base::SetSystemPagesAccess(void*, unsigned long, pdfium::base::PageAccessibilityConfiguration) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.734 pdfium.js?v=4543:4944 syscall! __sys_mprotect: [344915968,65536,0]
___sys_mprotect @ pdfium.js?v=4543:4944
__mprotect @ mprotect.c:10
pdfium::base::SetSystemPagesAccess(void*, unsigned long, pdfium::base::PageAccessibilityConfiguration) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.734 pdfium.js?v=4543:4952 syscall return: 0
___sys_mprotect @ pdfium.js?v=4543:4952
__mprotect @ mprotect.c:10
pdfium::base::SetSystemPagesAccess(void*, unsigned long, pdfium::base::PageAccessibilityConfiguration) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.734 pdfium.js?v=4543:4979 syscall! __sys_munmap: [343932928,1007616]
___sys_munmap @ pdfium.js?v=4543:4979
__munmap @ munmap.c:11
pdfium::base::FreePages(void*, unsigned long) @ sstream:887
pdfium::base::internal::DeferredUnmap::Unmap() @ sstream:887
FX_Free(void*) @ custom.cpp:27
CFX_DIBitmap::~CFX_DIBitmap().1 @ locale:1425
FPDFBitmap_Destroy @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.734 pdfium.js?v=4543:4994 syscall return: 0
___sys_munmap @ pdfium.js?v=4543:4994
__munmap @ munmap.c:11
pdfium::base::FreePages(void*, unsigned long) @ sstream:887
pdfium::base::internal::DeferredUnmap::Unmap() @ sstream:887
FX_Free(void*) @ custom.cpp:27
CFX_DIBitmap::~CFX_DIBitmap().1 @ locale:1425
FPDFBitmap_Destroy @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1980:1
17:06:00.738 (2) [Memory(16384), 1073741824]
17:06:03.370 _PDFium_Init(); var w = 496, h = 496; for (let i = 0; i < 1; i++) _FPDFBitmap_Destroy(_FPDFBitmap_CreateEx(w, h, 4)); [ wasmMemory, wasmMemory.buffer.byteLength ] // ❌
17:06:03.370 pdfium.js?v=4543:4924 syscall! __sys_mmap2: [0,1007616,3,34,-1,0]
___sys_mmap2 @ pdfium.js?v=4543:4924
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.371 VM1972:14 memalign ƒ 8416() { [native code] }            345833472 <-                65536              1007616 |           1073741824 |              4108288 M 2
(anonymous) @ VM1972:14
(anonymous) @ pdfium.js?v=4543:1222
syscallMmap2 @ pdfium.js?v=4543:4900
(anonymous) @ pdfium.js?v=4543:4928
___sys_mmap2 @ pdfium.js?v=4543:4935
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.371 pdfium.js?v=4543:4939 syscall return: 345833472
___sys_mmap2 @ pdfium.js?v=4543:4939
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.371 pdfium.js?v=4543:4979 syscall! __sys_munmap: [345833472,1007616]
___sys_munmap @ pdfium.js?v=4543:4979
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.372 VM1972:14 free     ƒ 8409() { [native code] }            undefined <-            345833472                    - |           1073741824 |              3100672 M 1
(anonymous) @ VM1972:14
(anonymous) @ pdfium.js?v=4543:1222
syscallMunmap @ pdfium.js?v=4543:4972
(anonymous) @ pdfium.js?v=4543:4983
___sys_munmap @ pdfium.js?v=4543:4990
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.372 pdfium.js?v=4543:4994 syscall return: 0
___sys_munmap @ pdfium.js?v=4543:4994
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.372 pdfium.js?v=4543:4924 syscall! __sys_mmap2: [346030080,1007616,3,34,-1,0]
___sys_mmap2 @ pdfium.js?v=4543:4924
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.373 VM1972:14 memalign ƒ 8416() { [native code] }            347144192 <-                65536              1007616 |           1073741824 |              4108288 M 2
(anonymous) @ VM1972:14
(anonymous) @ pdfium.js?v=4543:1222
syscallMmap2 @ pdfium.js?v=4543:4900
(anonymous) @ pdfium.js?v=4543:4928
___sys_mmap2 @ pdfium.js?v=4543:4935
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.373 pdfium.js?v=4543:4939 syscall return: 347144192
___sys_mmap2 @ pdfium.js?v=4543:4939
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.373 pdfium.js?v=4543:4979 syscall! __sys_munmap: [347144192,1007616]
___sys_munmap @ pdfium.js?v=4543:4979
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.373 VM1972:14 free     ƒ 8409() { [native code] }            undefined <-            347144192                    - |           1073741824 |              3100672 M 1
(anonymous) @ VM1972:14
(anonymous) @ pdfium.js?v=4543:1222
syscallMunmap @ pdfium.js?v=4543:4972
(anonymous) @ pdfium.js?v=4543:4983
___sys_munmap @ pdfium.js?v=4543:4990
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.373 pdfium.js?v=4543:4994 syscall return: 0
___sys_munmap @ pdfium.js?v=4543:4994
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.373 pdfium.js?v=4543:4924 syscall! __sys_mmap2: [4096,3100672,3,34,-1,0]
___sys_mmap2 @ pdfium.js?v=4543:4924
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.375 VM1972:14 memalign ƒ 8416() { [native code] }            348454912 <-                65536              3100672 |           1073741824 |              6201344 M 2
(anonymous) @ VM1972:14
(anonymous) @ pdfium.js?v=4543:1222
syscallMmap2 @ pdfium.js?v=4543:4900
(anonymous) @ pdfium.js?v=4543:4928
___sys_mmap2 @ pdfium.js?v=4543:4935
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.375 pdfium.js?v=4543:4939 syscall return: 348454912
___sys_mmap2 @ pdfium.js?v=4543:4939
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.375 pdfium.js?v=4543:4979 syscall! __sys_munmap: [348454912,1769472]
___sys_munmap @ pdfium.js?v=4543:4979
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.375 pdfium.js?v=4543:4994 syscall return: 0
___sys_munmap @ pdfium.js?v=4543:4994
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.375 pdfium.js?v=4543:4979 syscall! __sys_munmap: [351232000,323584]
___sys_munmap @ pdfium.js?v=4543:4979
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.375 pdfium.js?v=4543:4994 syscall return: 0
___sys_munmap @ pdfium.js?v=4543:4994
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.375 pdfium.js?v=4543:4944 syscall! __sys_mprotect: [350224384,65536,0]
___sys_mprotect @ pdfium.js?v=4543:4944
__mprotect @ mprotect.c:10
pdfium::base::SetSystemPagesAccess(void*, unsigned long, pdfium::base::PageAccessibilityConfiguration) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.375 pdfium.js?v=4543:4952 syscall return: 0
___sys_mprotect @ pdfium.js?v=4543:4952
__mprotect @ mprotect.c:10
pdfium::base::SetSystemPagesAccess(void*, unsigned long, pdfium::base::PageAccessibilityConfiguration) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.375 pdfium.js?v=4543:4944 syscall! __sys_mprotect: [350224384,65536,0]
___sys_mprotect @ pdfium.js?v=4543:4944
__mprotect @ mprotect.c:10
pdfium::base::SetSystemPagesAccess(void*, unsigned long, pdfium::base::PageAccessibilityConfiguration) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.375 pdfium.js?v=4543:4952 syscall return: 0
___sys_mprotect @ pdfium.js?v=4543:4952
__mprotect @ mprotect.c:10
pdfium::base::SetSystemPagesAccess(void*, unsigned long, pdfium::base::PageAccessibilityConfiguration) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.375 pdfium.js?v=4543:4944 syscall! __sys_mprotect: [351207424,65536,0]
___sys_mprotect @ pdfium.js?v=4543:4944
__mprotect @ mprotect.c:10
pdfium::base::SetSystemPagesAccess(void*, unsigned long, pdfium::base::PageAccessibilityConfiguration) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.376 pdfium.js?v=4543:4952 syscall return: 0
___sys_mprotect @ pdfium.js?v=4543:4952
__mprotect @ mprotect.c:10
pdfium::base::SetSystemPagesAccess(void*, unsigned long, pdfium::base::PageAccessibilityConfiguration) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.376 pdfium.js?v=4543:4979 syscall! __sys_munmap: [350224384,1007616]
___sys_munmap @ pdfium.js?v=4543:4979
__munmap @ munmap.c:11
pdfium::base::FreePages(void*, unsigned long) @ sstream:887
pdfium::base::internal::DeferredUnmap::Unmap() @ sstream:887
FX_Free(void*) @ custom.cpp:27
CFX_DIBitmap::~CFX_DIBitmap().1 @ locale:1425
FPDFBitmap_Destroy @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.376 pdfium.js?v=4543:4994 syscall return: 0
___sys_munmap @ pdfium.js?v=4543:4994
__munmap @ munmap.c:11
pdfium::base::FreePages(void*, unsigned long) @ sstream:887
pdfium::base::internal::DeferredUnmap::Unmap() @ sstream:887
FX_Free(void*) @ custom.cpp:27
CFX_DIBitmap::~CFX_DIBitmap().1 @ locale:1425
FPDFBitmap_Destroy @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1985:1
17:06:03.391 (2) [Memory(16384), 1073741824]
17:06:05.043 _PDFium_Init(); var w = 496, h = 496; for (let i = 0; i < 1; i++) _FPDFBitmap_Destroy(_FPDFBitmap_CreateEx(w, h, 4)); [ wasmMemory, wasmMemory.buffer.byteLength ] // ❌
17:06:05.043 pdfium.js?v=4543:4924 syscall! __sys_mmap2: [0,1007616,3,34,-1,0]
___sys_mmap2 @ pdfium.js?v=4543:4924
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.044 VM1972:14 memalign ƒ 8416() { [native code] }            351862784 <-                65536              1007616 |           1073741824 |              7208960 M 3
(anonymous) @ VM1972:14
(anonymous) @ pdfium.js?v=4543:1222
syscallMmap2 @ pdfium.js?v=4543:4900
(anonymous) @ pdfium.js?v=4543:4928
___sys_mmap2 @ pdfium.js?v=4543:4935
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.044 pdfium.js?v=4543:4939 syscall return: 351862784
___sys_mmap2 @ pdfium.js?v=4543:4939
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.044 pdfium.js?v=4543:4979 syscall! __sys_munmap: [351862784,1007616]
___sys_munmap @ pdfium.js?v=4543:4979
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.044 VM1972:14 free     ƒ 8409() { [native code] }            undefined <-            351862784                    - |           1073741824 |              6201344 M 2
(anonymous) @ VM1972:14
(anonymous) @ pdfium.js?v=4543:1222
syscallMunmap @ pdfium.js?v=4543:4972
(anonymous) @ pdfium.js?v=4543:4983
___sys_munmap @ pdfium.js?v=4543:4990
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.044 pdfium.js?v=4543:4994 syscall return: 0
___sys_munmap @ pdfium.js?v=4543:4994
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.044 pdfium.js?v=4543:4924 syscall! __sys_mmap2: [352321536,1007616,3,34,-1,0]
___sys_mmap2 @ pdfium.js?v=4543:4924
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.046 VM1972:14 memalign ƒ 8416() { [native code] }            353173504 <-                65536              1007616 |           1073741824 |              7208960 M 3
(anonymous) @ VM1972:14
(anonymous) @ pdfium.js?v=4543:1222
syscallMmap2 @ pdfium.js?v=4543:4900
(anonymous) @ pdfium.js?v=4543:4928
___sys_mmap2 @ pdfium.js?v=4543:4935
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.046 pdfium.js?v=4543:4939 syscall return: 353173504
___sys_mmap2 @ pdfium.js?v=4543:4939
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.046 pdfium.js?v=4543:4979 syscall! __sys_munmap: [353173504,1007616]
___sys_munmap @ pdfium.js?v=4543:4979
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.046 VM1972:14 free     ƒ 8409() { [native code] }            undefined <-            353173504                    - |           1073741824 |              6201344 M 2
(anonymous) @ VM1972:14
(anonymous) @ pdfium.js?v=4543:1222
syscallMunmap @ pdfium.js?v=4543:4972
(anonymous) @ pdfium.js?v=4543:4983
___sys_munmap @ pdfium.js?v=4543:4990
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.046 pdfium.js?v=4543:4994 syscall return: 0
___sys_munmap @ pdfium.js?v=4543:4994
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.046 pdfium.js?v=4543:4924 syscall! __sys_mmap2: [4096,3100672,3,34,-1,0]
___sys_mmap2 @ pdfium.js?v=4543:4924
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.048 VM1972:14 memalign ƒ 8416() { [native code] }            354484224 <-                65536              3100672 |           1073741824 |              9302016 M 3
(anonymous) @ VM1972:14
(anonymous) @ pdfium.js?v=4543:1222
syscallMmap2 @ pdfium.js?v=4543:4900
(anonymous) @ pdfium.js?v=4543:4928
___sys_mmap2 @ pdfium.js?v=4543:4935
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.049 pdfium.js?v=4543:4939 syscall return: 354484224
___sys_mmap2 @ pdfium.js?v=4543:4939
__mmap @ mmap.c:29
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.049 pdfium.js?v=4543:4979 syscall! __sys_munmap: [354484224,2031616]
___sys_munmap @ pdfium.js?v=4543:4979
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.049 pdfium.js?v=4543:4994 syscall return: 0
___sys_munmap @ pdfium.js?v=4543:4994
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.049 pdfium.js?v=4543:4979 syscall! __sys_munmap: [357523456,61440]
___sys_munmap @ pdfium.js?v=4543:4979
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.049 pdfium.js?v=4543:4994 syscall return: 0
___sys_munmap @ pdfium.js?v=4543:4994
__munmap @ munmap.c:11
pdfium::base::AllocPages(void*, unsigned long, unsigned long, pdfium::base::PageAccessibilityConfiguration, pdfium::base::PageTag, bool) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.049 pdfium.js?v=4543:4944 syscall! __sys_mprotect: [356515840,65536,0]
___sys_mprotect @ pdfium.js?v=4543:4944
__mprotect @ mprotect.c:10
pdfium::base::SetSystemPagesAccess(void*, unsigned long, pdfium::base::PageAccessibilityConfiguration) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.049 pdfium.js?v=4543:4952 syscall return: 0
___sys_mprotect @ pdfium.js?v=4543:4952
__mprotect @ mprotect.c:10
pdfium::base::SetSystemPagesAccess(void*, unsigned long, pdfium::base::PageAccessibilityConfiguration) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.049 pdfium.js?v=4543:4944 syscall! __sys_mprotect: [356515840,65536,0]
___sys_mprotect @ pdfium.js?v=4543:4944
__mprotect @ mprotect.c:10
pdfium::base::SetSystemPagesAccess(void*, unsigned long, pdfium::base::PageAccessibilityConfiguration) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.049 pdfium.js?v=4543:4952 syscall return: 0
___sys_mprotect @ pdfium.js?v=4543:4952
__mprotect @ mprotect.c:10
pdfium::base::SetSystemPagesAccess(void*, unsigned long, pdfium::base::PageAccessibilityConfiguration) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.049 pdfium.js?v=4543:4944 syscall! __sys_mprotect: [357498880,65536,0]
___sys_mprotect @ pdfium.js?v=4543:4944
__mprotect @ mprotect.c:10
pdfium::base::SetSystemPagesAccess(void*, unsigned long, pdfium::base::PageAccessibilityConfiguration) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.049 pdfium.js?v=4543:4952 syscall return: 0
___sys_mprotect @ pdfium.js?v=4543:4952
__mprotect @ mprotect.c:10
pdfium::base::SetSystemPagesAccess(void*, unsigned long, pdfium::base::PageAccessibilityConfiguration) @ sstream:887
pdfium::base::internal::PartitionBucket::SlowPathAlloc(pdfium::base::internal::PartitionRootBase*, int, unsigned long, bool*) @ sstream:887
pdfium::internal::Calloc(unsigned long, unsigned long) @ custom.cpp:27
CFX_DIBitmap::Create(int, int, FXDIB_Format, unsigned char*, unsigned int) @ locale:1425
FPDFBitmap_CreateEx @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.049 pdfium.js?v=4543:4979 syscall! __sys_munmap: [356515840,1007616]
___sys_munmap @ pdfium.js?v=4543:4979
__munmap @ munmap.c:11
pdfium::base::FreePages(void*, unsigned long) @ sstream:887
pdfium::base::internal::DeferredUnmap::Unmap() @ sstream:887
FX_Free(void*) @ custom.cpp:27
CFX_DIBitmap::~CFX_DIBitmap().1 @ locale:1425
FPDFBitmap_Destroy @ sstream:887
(anonymous) @ pdfium.js?v=4543:1222
(anonymous) @ VM1990:1
17:06:05.049 pdfium.js?v=4543:4994 syscall return: 0

---

⋮
  if (len === info.len) { // ❌ this check fails on the 3rd call
⋮

---

https://pdf.ist/em/14459/ – further instrumented for your convenience.

function syscallMmap2(addr, len, prot, flags, fd, off) {
 ⋮
 console.warn('🕵🏻‍♂️📖', 'mmap2 ', { addr, len, prot, fd, off }, "→", ptr, "→", SYSCALLS.mappings[ptr]);
 return ptr;
}

function syscallMunmap(addr, len) {
 if ((addr | 0) === -1 || len === 0) {
  return -28;
 }
 var info = SYSCALLS.mappings[addr];
 console.warn('🕵🏻‍♂️📘', 'munmap', { addr, len }, "→", { ...info }, { 'len ===': len === info?.len ? '✔️' : '❌' });
 ⋮
}

[CetinSert]

Is it not safe to change this

if (len === info.len)

to this

if (len <=  info.len)

assuming emscripten bookkeeps the memory block from info.malloc to info.malloc + info.len as reserved anyway?

---

References

https://pubs.opengroup.org/onlinepubs/9699919799/ (🔍 munmap, mmap)
https://pubs.opengroup.org/onlinepubs/9699919799/functions/munmap.html