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kostya-sh opened this issue Jan 26, 2016 · 4 comments
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runtime: fatal error: missed stack barrier #14101

kostya-sh opened this issue Jan 26, 2016 · 4 comments
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Go1.6

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@kostya-sh
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A program with trace enabled (runtime/trace.Start) compiled with Go tip (e634765) panics with fatal error: missed stack barrier fairly consistently (1 run in 2).

OS: Debian 8.2
Hardware: 4 cores i7-4700MQ
Full source code: https://github.com/kostya-sh/sandbox/blob/master/tfb-go/app-files/src/hello/hello.go
To trigger a panic:

$ curl http://localhost:8080/profile/start?f=x
$ wrk -t4 -c4 -d60 http://localhost:8080/json

Full stack trace:

found next stack barrier at 0xc82045ff90; expected [@@@ *0xc82045ff90=0x464401 ==>]
fatal error: missed stack barrier

runtime stack:
runtime.throw(0x8d7130, 0x14)
    /home/ksh/work/os-code/go/src/runtime/panic.go:530 +0x90
runtime.gentraceback(0x654185, 0xc82045f8a8, 0x0, 0xc820001680, 0x0, 0x7f74a4400020, 0x80, 0x0, 0x0, 0x0, ...)
    /home/ksh/work/os-code/go/src/runtime/traceback.go:295 +0x1560
runtime.gcallers(0xc820001680, 0x1, 0x7f74a4400020, 0x80, 0x80, 0x944138)
    /home/ksh/work/os-code/go/src/runtime/traceback.go:609 +0x7f
runtime.traceEvent(0x4d821c, 0x1, 0x0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/runtime/trace.go:532 +0x599
runtime.traceGoSysCall()
    /home/ksh/work/os-code/go/src/runtime/trace.go:873 +0x36
runtime.systemstack(0xc82016a4c0)
    /home/ksh/work/os-code/go/src/runtime/asm_amd64.s:291 +0x79
runtime.mstart()
    /home/ksh/work/os-code/go/src/runtime/proc.go:1048

goroutine 8 [syscall]:
syscall.Syscall(0x1, 0xb, 0xc8201a4000, 0x94, 0x43110d, 0xc82045f8f8, 0x4d5448)
    /home/ksh/work/os-code/go/src/syscall/asm_linux_amd64.s:18 +0x5 fp=0xc82045f8b0 sp=0xc82045f8a8
syscall.write(0xb, 0xc8201a4000, 0x94, 0x1000, 0x77, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/syscall/zsyscall_linux_amd64.go:1064 +0x5f fp=0xc82045f8f0 sp=0xc82045f8b0
syscall.Write(0xb, 0xc8201a4000, 0x94, 0x1000, 0xc81ffe0a02, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/syscall/syscall_unix.go:180 +0x4d fp=0xc82045f930 sp=0xc82045f8f0
net.(*netFD).Write(0xc82001a1c0, 0xc8201a4000, 0x94, 0x1000, 0x0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/fd_unix.go:328 +0x1c7 fp=0xc82045fa00 sp=0xc82045f930
net.(*conn).Write(0xc82002c050, 0xc8201a4000, 0x94, 0x1000, 0x0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/net.go:184 +0xe4 fp=0xc82045fa68 sp=0xc82045fa00
net/http.checkConnErrorWriter.Write(0xc8200e2380, 0xc8201a4000, 0x94, 0x1000, 0x0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/http/server.go:2538 +0x71 fp=0xc82045fab8 sp=0xc82045fa68
bufio.(*Writer).flush(0xc820058580, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/bufio/bufio.go:562 +0xe0 fp=0xc82045fb80 sp=0xc82045fab8
bufio.(*Writer).Flush(0xc820058580, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/bufio/bufio.go:551 +0x2d fp=0xc82045fba0 sp=0xc82045fb80
net/http.(*response).finishRequest(0xc8204ad110)
    /home/ksh/work/os-code/go/src/net/http/server.go:1251 +0xab fp=0xc82045fbd0 sp=0xc82045fba0
net/http.(*conn).serve(0xc8200e2380)
    /home/ksh/work/os-code/go/src/net/http/server.go:1474 +0xf68 fp=0xc82045ff98 sp=0xc82045fbd0
runtime.goexit()
    /home/ksh/work/os-code/go/src/runtime/asm_amd64.s:1998 +0x1 fp=0xc82045ffa0 sp=0xc82045ff98
created by net/http.(*Server).Serve
    /home/ksh/work/os-code/go/src/net/http/server.go:2135 +0x44e

goroutine 1 [IO wait]:
net.runtime_pollWait(0x7f74a44f1138, 0x72, 0x0)
    /home/ksh/work/os-code/go/src/runtime/netpoll.go:160 +0x60
net.(*pollDesc).Wait(0xc82013a300, 0x72, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/fd_poll_runtime.go:73 +0x3a
net.(*pollDesc).WaitRead(0xc82013a300, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/fd_poll_runtime.go:78 +0x36
net.(*netFD).accept(0xc82013a2a0, 0x0, 0x7f74a44f13f8, 0xc82010c8a0)
    /home/ksh/work/os-code/go/src/net/fd_unix.go:426 +0x27c
net.(*TCPListener).AcceptTCP(0xc820128058, 0x459440, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/tcpsock_posix.go:254 +0x4d
net/http.tcpKeepAliveListener.Accept(0xc820128058, 0x0, 0x0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/http/server.go:2423 +0x41
net/http.(*Server).Serve(0xc82012a480, 0x7f74a44f15e0, 0xc820128058, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/http/server.go:2115 +0x129
net/http.(*Server).ListenAndServe(0xc82012a480, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/http/server.go:2096 +0x136
net/http.ListenAndServe(0x87ecd8, 0x5, 0x0, 0x0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/http/server.go:2193 +0x98
main.main()
    /home/ksh/work/go/src/github.com/kostya-sh/sandbox/tfb-go/app-files/src/hello/hello.go:147 +0x3aa

goroutine 17 [syscall, locked to thread]:
runtime.goexit()
    /home/ksh/work/os-code/go/src/runtime/asm_amd64.s:1998 +0x1

goroutine 34 [IO wait]:
net.runtime_pollWait(0x7f74a44f0ef8, 0x72, 0xc82013f000)
    /home/ksh/work/os-code/go/src/runtime/netpoll.go:160 +0x60
net.(*pollDesc).Wait(0xc82015e060, 0x72, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/fd_poll_runtime.go:73 +0x3a
net.(*pollDesc).WaitRead(0xc82015e060, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/fd_poll_runtime.go:78 +0x36
net.(*netFD).Read(0xc82015e000, 0xc82013f000, 0x1000, 0x1000, 0x0, 0x7f74a4530050, 0xc82000a1d0)
    /home/ksh/work/os-code/go/src/net/fd_unix.go:250 +0x23a
net.(*conn).Read(0xc820162000, 0xc82013f000, 0x1000, 0x1000, 0x0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/net.go:172 +0xe4
net/http.(*connReader).Read(0xc82010c840, 0xc82013f000, 0x1000, 0x1000, 0x0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/http/server.go:526 +0x196
bufio.(*Reader).fill(0xc82012e120)
    /home/ksh/work/os-code/go/src/bufio/bufio.go:97 +0x1e9
bufio.(*Reader).ReadSlice(0xc82012e120, 0xa, 0x0, 0x0, 0x0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/bufio/bufio.go:328 +0x21a
bufio.(*Reader).ReadLine(0xc82012e120, 0x0, 0x0, 0x0, 0x861800, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/bufio/bufio.go:357 +0x53
net/textproto.(*Reader).readLineSlice(0xc82048d800, 0x0, 0x0, 0x0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/textproto/reader.go:55 +0x81
net/textproto.(*Reader).ReadLine(0xc82048d800, 0x0, 0x0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/textproto/reader.go:36 +0x40
net/http.readRequest(0xc82012e120, 0x0, 0xc8203940e0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/http/request.go:707 +0xb6
net/http.(*conn).readRequest(0xc820166000, 0x0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/http/server.go:703 +0x359
net/http.(*conn).serve(0xc820166000)
    /home/ksh/work/os-code/go/src/net/http/server.go:1423 +0x947
created by net/http.(*Server).Serve
    /home/ksh/work/os-code/go/src/net/http/server.go:2135 +0x44e

goroutine 18 [chan receive]:
database/sql.(*DB).connectionOpener(0xc820130000)
    /home/ksh/work/os-code/go/src/database/sql/sql.go:728 +0x45
created by database/sql.Open
    /home/ksh/work/os-code/go/src/database/sql/sql.go:494 +0x33f

goroutine 21 [runnable]:
net/textproto.(*Reader).ReadLine(0xc820410000, 0xc82029b7a0, 0xc820062c00, 0x457490, 0xc820062c00)
    /home/ksh/work/os-code/go/src/net/textproto/reader.go:35
net/http.readRequest(0xc82012e1e0, 0x0, 0xc82029b7a0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/http/request.go:707 +0xb6
net/http.(*conn).readRequest(0xc82012a700, 0x0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/http/server.go:703 +0x359
net/http.(*conn).serve(0xc82012a700)
    /home/ksh/work/os-code/go/src/net/http/server.go:1423 +0x947
created by net/http.(*Server).Serve
    /home/ksh/work/os-code/go/src/net/http/server.go:2135 +0x44e

goroutine 20 [trace reader (blocked)]:
runtime.ReadTrace(0x0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/runtime/trace.go:356 +0x1cc
runtime/trace.Start.func1(0x7f74a4534218, 0xc820128070)
    /home/ksh/work/os-code/go/src/runtime/trace/trace.go:28 +0x18
created by runtime/trace.Start
    /home/ksh/work/os-code/go/src/runtime/trace/trace.go:34 +0x78

goroutine 22 [runnable]:
net.(*pollDesc).PrepareWrite(0xc82013a4c0, 0x944138, 0xc82013a460)
    /home/ksh/work/os-code/go/src/net/fd_poll_runtime.go:68
net.(*netFD).Write(0xc82013a460, 0xc82015a000, 0x94, 0x1000, 0x0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/fd_unix.go:323 +0x105
net.(*conn).Write(0xc8201280b0, 0xc82015a000, 0x94, 0x1000, 0x0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/net.go:184 +0xe4
net/http.checkConnErrorWriter.Write(0xc82012a880, 0xc82015a000, 0x94, 0x1000, 0x0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/net/http/server.go:2538 +0x71
bufio.(*Writer).flush(0xc82011e7c0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/bufio/bufio.go:562 +0xe0
bufio.(*Writer).Flush(0xc82011e7c0, 0x0, 0x0)
    /home/ksh/work/os-code/go/src/bufio/bufio.go:551 +0x2d
net/http.(*response).finishRequest(0xc8203961a0)
    /home/ksh/work/os-code/go/src/net/http/server.go:1251 +0xab
net/http.(*conn).serve(0xc82012a880)
    /home/ksh/work/os-code/go/src/net/http/server.go:1474 +0xf68
created by net/http.(*Server).Serve
    /home/ksh/work/os-code/go/src/net/http/server.go:2135 +0x44e
@bradfitz bradfitz added this to the Go1.6Maybe milestone Jan 26, 2016
@aclements
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It looks like traceEvent needs to take the stack lock, too. Sigh.

@aclements aclements modified the milestones: Go1.6, Go1.6Maybe Jan 26, 2016
@aclements
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@kostya-sh, https://go-review.googlesource.com/18973 should fix this. Can you give it a spin?

@gopherbot
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CL https://golang.org/cl/18973 mentions this issue.

@kostya-sh
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@aclements, thank you. Works like a charm! I haven't been able to reproduce the panic with this patch applied.

@golang golang locked and limited conversation to collaborators Feb 3, 2017
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