runtime: diagnose non-GOARM=5 binaries running on armv5

[gopherbot]

by rounin.urashima:

Before filing a bug, please check whether it has been fixed since the
latest release. Search the issue tracker and check that you're running the
latest version of Go:

Run "go version" and compare against
http://golang.org/doc/devel/release.html  If a newer version of Go exists,
install it and retry what you did to reproduce the problem.

Thanks.

What steps will reproduce the problem?

With regards to my Issue ticket 3645:

issue #3645:    ./hello displays Illegal instruction using hg update default on ARM CPU
based CISCO Linksys NSLU2

I started again to install go on this ARM based system and now get the following 
message:

rounin@LKG80B859:~/go/src$ time ./all.bash
# Building C bootstrap tool.
cmd/dist

# Building compilers and Go bootstrap tool for host, linux/arm.
lib9
libbio
libmach
misc/pprof
cmd/addr2line
cmd/cov
cmd/nm
cmd/objdump
cmd/pack
cmd/prof
cmd/cc
cmd/gc
cmd/5l
cmd/5a
cmd/5c
cmd/5g
pkg/runtime
pkg/errors
pkg/sync/atomic
pkg/sync
pkg/io
pkg/unicode
pkg/unicode/utf8
pkg/unicode/utf16
pkg/bytes
pkg/math
pkg/strings
pkg/strconv
pkg/bufio
pkg/sort
pkg/container/heap
pkg/encoding/base64
pkg/syscall
pkg/time
pkg/os
pkg/reflect
pkg/fmt
pkg/encoding/json
pkg/flag
pkg/path/filepath
pkg/path
pkg/io/ioutil
pkg/log
pkg/regexp/syntax
pkg/regexp
pkg/go/token
pkg/go/scanner
pkg/go/ast
pkg/go/parser
pkg/os/exec
pkg/net/url
pkg/text/template/parse
pkg/text/template
pkg/go/doc
pkg/go/build
cmd/go
./make.bash: line 119:  7061 Illegal instruction     "$GOTOOLDIR"/go_bootstrap
clean -i std

real    54m16.156s
user    31m21.340s
sys     2m49.460s
rounin@LKG80B859:~/go/src$ hg identify
9876d0195923 tip
rounin@LKG80B859:~/go/src$ uname -a
Linux LKG80B859 2.6.32-5-ixp4xx #1 Sun May 6 12:28:42 UTC 2012 armv5tel GNU/Linux

[rsc]

Comment 1:

Please try
export GOARM=5
./all.bash

[rsc]

Comment 2:

Can we do something to detect old ARM very early on, or perhaps catch illegal
instruction, and either way print a message suggesting the problem?
How do we detect old ARM chips at run time?

Status changed to Accepted.

[minux]

Comment 3:

either by catching sigill or inspect runtime·armArch and runtime·hwcap (these are
specific to Linux/ARM).

[minux]

Comment 4:

i'm also thinking if we can make GOARM!=5 binary runable on non-VFP systems by
catching sigill and do the floating point emulation in the sighandler?

[rsc]

Comment 5:

I would rather print an error an exit than try to do FP in the signal
handler. It will be ridiculously slow and no one will know why.
Russ

[gopherbot]

Comment 6 by rounin.urashima:

Hello Russ,
Thank you. Looking good so far. Still going:
rounin@LKG80B859:~$ cat -n build.go.txt|less
     1  Script started on Mon 06 Aug 2012 11:41:57 BST
     2  rounin@LKG80B859:~/go/src$ export GOARM=5
     3  rounin@LKG80B859:~/go/src$ time ./all.bash
     4  # Building C bootstrap tool.
     5  cmd/dist
     6
     7  # Building compilers and Go bootstrap tool for host, linux/arm.
     8  lib9
     9  libbio
    10  libmach
    11  misc/pprof
    12  cmd/addr2line
    13  cmd/cov
    14  cmd/nm
    15  cmd/objdump
    16  cmd/pack
    17  cmd/prof
    18  cmd/cc
    19  cmd/gc
    20  cmd/5l
    21  cmd/5a
    22  cmd/5c
    23  cmd/5g
    24  pkg/runtime
    25  pkg/errors
    26  pkg/sync/atomic
    27  pkg/sync
    28  pkg/io
    29  pkg/unicode
    30  pkg/unicode/utf8
    31  pkg/unicode/utf16
    32  pkg/bytes
    33  pkg/math
    34  pkg/strings
    35  pkg/strconv
    36  pkg/bufio
    37  pkg/sort
    38  pkg/container/heap
    39  pkg/encoding/base64
    40  pkg/syscall
    41  pkg/time
    42  pkg/os
    43  pkg/reflect
    44  pkg/fmt
    45  pkg/encoding/json
    46  pkg/flag
    47  pkg/path/filepath
    48  pkg/path
    49  pkg/io/ioutil
    50  pkg/log
    51  pkg/regexp/syntax
    52  pkg/regexp
    53  pkg/go/token
    54  pkg/go/scanner
    55  pkg/go/ast
    56  pkg/go/parser
    57  pkg/os/exec
    58  pkg/net/url
    59  pkg/text/template/parse
    60  pkg/text/template
    61  pkg/go/doc
    62  pkg/go/build
    63  cmd/go
    64
    65  # Building packages and commands for linux/arm.
    66  runtime
    67  errors
    68  sync/atomic
    69  sync
    70  io
    71  unicode
    72  unicode/utf8
    73  bytes
    74  bufio
    75  math
    76  syscall
    77  time
    78  os
    79  strconv
    80  reflect
    81  fmt
    82  sort
    83  flag
    84  go/token
    85  strings
    86  path/filepath
    87  go/scanner
    88  go/ast
    89  regexp/syntax
    90  regexp
    91  io/ioutil
    92  net/url
    93  text/template/parse
    94  text/template
    95  go/doc
    96  go/parser
    97  log
    98  path
    99  go/build
   100  text/tabwriter
   101  go/printer
   102  os/exec
   103  cmd/api
   104  hash
   105  crypto
   106  crypto/md5
   107  encoding/binary
   108  debug/dwarf
   109  debug/elf
   110  debug/macho
   111  debug/pe
   112  cmd/cgo
   113  cmd/fix
   114  container/heap
   115  encoding/base64
   116  unicode/utf16
   117  encoding/json
   118  encoding/xml
   119  compress/flate
   120  hash/crc32
   121  compress/gzip
   122  crypto/cipher
   123  crypto/aes
   124  crypto/des
   125  math/rand
   126  math/big
   127  crypto/elliptic
   128  crypto/hmac
   129  crypto/rand
   130  crypto/rc4
   131  crypto/subtle
   132  crypto/rsa
   133  crypto/sha1
   134  crypto/dsa
   135  crypto/ecdsa
   136  encoding/asn1
   137  crypto/x509/pkix
   138  encoding/pem
   139  crypto/x509
   140  runtime/cgo
   141  net
   142  crypto/tls
   143  mime
   144  net/textproto
   145  mime/multipart
   146  runtime/debug
   147  net/http
   148  cmd/go
   149  archive/zip
   150  encoding/gob
   151  expvar
   152  index/suffixarray
   153  html
   154  html/template
   155  runtime/pprof
   156  net/http/pprof
   157  text/scanner
   158  cmd/godoc
   159  cmd/gofmt
   160  cmd/vet
   161  cmd/yacc
   162  archive/tar
   163  compress/bzip2
   164  compress/lzw
   165  hash/adler32
   166  compress/zlib
   167  container/list
   168  container/ring
   169  crypto/sha256
   170  crypto/sha512
   171  database/sql/driver
   172  database/sql
   173  debug/gosym
   174  encoding/ascii85
   175  encoding/base32
   176  encoding/csv
   177  encoding/hex
   178  exp/ebnf
   179  exp/ebnflint
   180  exp/types
   181  exp/gotype
   182  exp/html/atom
   183  exp/html
   184  exp/inotify
   185  exp/norm
   186  exp/locale/collate
   187  hash/fnv
   188  exp/locale/collate/build
   189  exp/proxy
   190  exp/utf8string
   191  hash/crc64
   192  image/color
   193  image
   194  image/draw
   195  image/gif
   196  image/jpeg
   197  image/png
   198  log/syslog
   199  math/cmplx
   200  net/http/cgi
   201  net/http/fcgi
   202  net/http/httptest
   203  net/http/httputil
   204  net/mail
   205  net/rpc
   206  net/rpc/jsonrpc
   207  net/smtp
   208  old/netchan
   209  os/signal
   210  os/user
   211  testing
   212  testing/iotest
   213  testing/quick
   214
   215  # Testing packages.
   216  ok      cmd/api 1.609s
   217  ?       cmd/cgo [no test files]
   218  ok      cmd/fix 61.583s
   219  ok      cmd/go  1.597s
   220  ?       cmd/godoc       [no test files]
   221  ok      cmd/gofmt       3.026s
   222  ?       cmd/vet [no test files]
   223  ?       cmd/yacc        [no test files]
   224  ok      archive/tar     0.956s
   225  ok      archive/zip     3.231s
   226  ok      bufio   11.762s
   227  ok      bytes   6.291s
   228  ok      compress/bzip2  3.809s
   229  ok      compress/flate  37.460s
   230  ok      compress/gzip   1.680s
   231  ok      compress/lzw    5.801s
   232  ok      compress/zlib   66.413s
   233  ok      container/heap  0.944s
   234  ok      container/list  0.798s
   235  ok      container/ring  1.285s
   236  ?       crypto  [no test files]
   237  ok      crypto/aes      1.526s
   238  ok      crypto/cipher   0.841s
   239  ok      crypto/des      2.033s
   240  ok      crypto/dsa      1.711s
   241  ok      crypto/ecdsa    1.951s
   242  ok      crypto/elliptic 1.333s
   243  ok      crypto/hmac     0.942s
   244  ok      crypto/md5      1.013s
   245  ok      crypto/rand     1.679s
   246  ok      crypto/rc4      0.808s
   247  ok      crypto/rsa      15.313s
   248  ok      crypto/sha1     0.974s
   249  ok      crypto/sha256   0.891s
   250  ok      crypto/sha512   1.211s
   251  ok      crypto/subtle   0.964s
   252  ok      crypto/tls      14.152s
   253  ok      crypto/x509     72.952s
   254  ?       crypto/x509/pkix        [no test files]
   255  ok      database/sql    1.521s
   256  ok      database/sql/driver     0.865s
   257  ok      debug/dwarf     1.286s
   258  ok      debug/elf       1.494s
   259  ok      debug/gosym     0.835s
   260  ok      debug/macho     0.898s
   261  ok      debug/pe        0.724s
   262  ok      encoding/ascii85        1.024s
   263  ok      encoding/asn1   0.898s
   264  ok      encoding/base32 1.016s

[gopherbot]

Comment 7 by rounin.urashima:

Hello,
After setting GOARM=5 in .bashrc:
env |grep GO
GOBIN=/home/rounin/go/bin
GOARM=5
GOARCH=arm
GOROOT=/home/rounin/go
GOOS=linux
I can *run* and *build*:
rounin@LKG80B859:~$ cat -n hello.go
     1  package main
     2
     3  import "fmt"
     4
     5  func main() {
     6     fmt.Println("Hello, World")
     7  }
     8
rounin@LKG80B859:~$ time go run hello.go
Hello, World
real    0m59.841s
user    0m7.250s
sys     0m4.780s
rounin@LKG80B859:~$ time go build hello.go
real    0m49.543s
user    0m6.990s
sys     0m4.310s
Please note that this hardware is slow:
-=#=--=#=--=#=--=#=--=#=--=#=--=#=--=#=--=#=-
Script started on Mon 06 Aug 2012 11:41:57 BST
rounin@LKG80B859:~/go/src$ export GOARM=5
rounin@LKG80B859:~/go/src$ time ./all.bash
# Building C bootstrap tool.
cmd/dist
.
.
.
?       unsafe  [no test files]
real    1501m42.253s
user    91m55.010s
sys 103m0.120s
rounin@LKG80B859:~/go/src$ exit
Script done on Tue 07 Aug 2012 19:00:11 BST
-=#=--=#=--=#=--=#=--=#=--=#=--=#=--=#=--=#=-
But please see attached file for possible problems during compiling of the go tool set.
Script started on Mon 06 Aug 2012 11:41:57 BST
rounin@LKG80B859:~/go/src$ export GOARM=5
rounin@LKG80B859:~/go/src$ time ./all.bash
# Building C bootstrap tool.
cmd/dist
# Building compilers and Go bootstrap tool for host, linux/arm.
lib9
libbio
libmach
misc/pprof
cmd/addr2line
cmd/cov
cmd/nm
cmd/objdump
cmd/pack
cmd/prof
cmd/cc
cmd/gc
cmd/5l
cmd/5a
cmd/5c
cmd/5g
pkg/runtime
pkg/errors
pkg/sync/atomic
pkg/sync
pkg/io
pkg/unicode
pkg/unicode/utf8
pkg/unicode/utf16
pkg/bytes
pkg/math
pkg/strings
pkg/strconv
pkg/bufio
pkg/sort
pkg/container/heap
pkg/encoding/base64
pkg/syscall
pkg/time
.
.
.
cmd/go
# Building packages and commands for linux/arm.
runtime
.
.
.
path
go/build
text/tabwriter
go/printer
.
.
.
os/signal
os/user
testing
testing/iotest
testing/quick
# Testing packages.
ok      cmd/api 1.609s
?       cmd/cgo [no test files]
ok      cmd/fix 61.583s
ok      cmd/go  1.597s
?       cmd/godoc   [no test files]
ok      cmd/gofmt   3.026s
?       cmd/vet [no test files]
?       cmd/yacc    [no test files]
ok      archive/tar 0.956s
ok      archive/zip 3.231s
ok      bufio   11.762s
ok      bytes   6.291s
ok      compress/bzip2  3.809s
ok      compress/flate  37.460s
ok      compress/gzip   1.680s
ok      compress/lzw    5.801s
ok      compress/zlib   66.413s
ok      container/heap  0.944s
ok      container/list  0.798s
ok      container/ring  1.285s
?       crypto  [no test files]
ok      crypto/aes  1.526s
ok      crypto/cipher   0.841s
ok      crypto/des  2.033s
ok      crypto/dsa  1.711s
ok      crypto/ecdsa    1.951s
ok      crypto/elliptic 1.333s
ok      crypto/hmac 0.942s
ok      crypto/md5  1.013s
ok      crypto/rand 1.679s
ok      crypto/rc4  0.808s
ok      crypto/rsa  15.313s
ok      crypto/sha1 0.974s
ok      crypto/sha256   0.891s
ok      crypto/sha512   1.211s
ok      crypto/subtle   0.964s
ok      crypto/tls  14.152s
ok      crypto/x509 72.952s
?       crypto/x509/pkix    [no test files]
ok      database/sql    1.521s
ok      database/sql/driver 0.865s
ok      debug/dwarf 1.286s
ok      debug/elf   1.494s
ok      debug/gosym 0.835s
ok      debug/macho 0.898s
ok      debug/pe    0.724s
ok      encoding/ascii85    1.024s
ok      encoding/asn1   0.898s
ok      encoding/base32 1.016s
ok      encoding/base64 0.944s
ok      encoding/binary 1.070s
ok      encoding/csv    0.927s
ok      encoding/gob    2.938s
ok      encoding/hex    0.862s
ok      encoding/json   5.789s
ok      encoding/pem    1.167s
ok      encoding/xml    1.620s
ok      errors  0.732s
ok      exp/ebnf    0.971s
ok      exp/ebnflint    1.302s
ok      exp/gotype  27.003s
ok      exp/html    12.015s
ok      exp/html/atom   0.777s
ok      exp/inotify 2.123s
ok      exp/locale/collate  2.704s
ok      exp/locale/collate/build    1.133s
ok      exp/norm    63.184s
ok      exp/proxy   1.120s
ok      exp/types   7.785s
ok      exp/utf8string  0.943s
ok      expvar  1.316s
ok      flag    8.780s
ok      fmt 2.738s
ok      go/ast  5.840s
ok      go/build    16.679s
ok      go/doc  4.252s
ok      go/parser   2.981s
ok      go/printer  19.427s
ok      go/scanner  1.041s
ok      go/token    3.277s
?       hash    [no test files]
ok      hash/adler32    2.388s
ok      hash/crc32  0.711s
ok      hash/crc64  0.513s
ok      hash/fnv    0.747s
ok      html    0.973s
ok      html/template   3.506s
ok      image   4.652s
ok      image/color 1.152s
ok      image/draw  2.172s
?       image/gif   [no test files]
ok      image/jpeg  3.682s
ok      image/png   3.332s
ok      index/suffixarray   1.319s
ok      io  0.989s
ok      io/ioutil   0.880s
ok      log 1.038s
ok      log/syslog  1.704s
ok      math    2.765s
ok      math/big    30.742s
ok      math/cmplx  1.253s
ok      math/rand   33.438s
ok      mime    0.866s
ok      mime/multipart  6.396s
ok      net 4.740s
panic: test timed out
goroutine 591 [running]:
testing.alarm()
    /home/rounin/go/src/pkg/testing/testing.go:455 +0x5c
created by time.goFunc
    /home/rounin/go/src/pkg/time/sleep.go:94 +0x5c
goroutine 1 [chan receive]:
testing.RunTests(0x10c00, 0x3ff220, 0x77, 0x77, 0x10981501, ...)
    /home/rounin/go/src/pkg/testing/testing.go:369 +0x788
testing.Main(0x10c00, 0x3ff220, 0x77, 0x77, 0x3fa2b0, ...)
    /home/rounin/go/src/pkg/testing/testing.go:304 +0x70
main.main()
    /tmp/go-build232097131/net/http/_test/_testmain.go:287 +0x88
goroutine 2 [syscall]:
created by runtime.main
    /home/rounin/go/src/pkg/runtime/proc.c:220
goroutine 3 [timer goroutine (idle)]:
created by addtimer
    /home/rounin/go/src/pkg/runtime/ztime_linux_arm.c:72
goroutine 78 [semacquire]:
sync.runtime_Semacquire(0x11088cd0, 0x11088cd0)
    /home/rounin/go/src/pkg/runtime/zsema_linux_arm.c:146 +0x28
sync.(*Cond).Wait(0x109873c4, 0x10970100)
    /home/rounin/go/src/pkg/sync/cond.go:67 +0xdc
io.(*pipe).write(0x10987380, 0x109ba180, 0x13, 0x40, 0x0, ...)
    /home/rounin/go/src/pkg/io/pipe.go:90 +0x230
io.(*PipeWriter).Write(0x11088cb0, 0x109ba180, 0x13, 0x40, 0x1096b090, ...)
    /home/rounin/go/src/pkg/io/pipe.go:157 +0x60
net/http.(*populateResponse).Write(0x11096420, 0x109ba180, 0x13, 0x40, 0x50101, ...)
    /home/rounin/go/src/pkg/net/http/filetransport.go:122 +0xb4
fmt.Fprintln(0x1105ade0, 0x11096420, 0x401d1e58, 0x1, 0x1, ...)
    /home/rounin/go/src/pkg/fmt/print.go:280 +0xc4
net/http.Error(0x1105acc0, 0x11096420, 0x28aa40, 0x12, 0x194, ...)
    /home/rounin/go/src/pkg/net/http/server.go:730 +0x170
net/http.NotFound(0x1105acc0, 0x11096420)
    /home/rounin/go/src/pkg/net/http/server.go:734 +0x58
net/http.serveFile(0x1105acc0, 0x11096420, 0x10f39a10, 0x110c79a0, 0x10f4e270, ...)
    /home/rounin/go/src/pkg/net/http/fs.go:265 +0x208
net/http.(*fileHandler).ServeHTTP(0x11088c90, 0x1105acc0, 0x11096420, 0x10f39a10,
0x1105acc0, ...)
    /home/rounin/go/src/pkg/net/http/fs.go:359 +0x234
net/http.func·003(0x11088c90, 0x11088ca0, 0x11088c98, 0x3ff370)
    /home/rounin/go/src/pkg/net/http/filetransport.go:43 +0x74
created by net/http.fileTransport.RoundTrip
    /home/rounin/go/src/pkg/net/http/filetransport.go:45 +0xd4
goroutine 26 [syscall]:
syscall.Syscall6()
    /home/rounin/go/src/pkg/syscall/asm_linux_arm.s:42 +0x8
syscall.EpollWait(0x7, 0x10985ea8, 0xa, 0xa, 0xffffffff, ...)
    /home/rounin/go/src/pkg/syscall/zsyscall_linux_arm.go:262 +0x9c
net.(*pollster).WaitFD(0x10985ea0, 0x10901810, 0x0, 0x0, 0x0, ...)
    /home/rounin/go/src/pkg/net/fd_linux.go:146 +0x150
net.(*pollServer).Run(0x10901810, 0x0)
    /home/rounin/go/src/pkg/net/fd.go:236 +0x140
created by net.newPollServer
    /home/rounin/go/src/pkg/net/newpollserver.go:35 +0x440
goroutine 293 [chan receive]:
net/http.(*persistConn).writeLoop(0x10f91730, 0x109000e0)
    /home/rounin/go/src/pkg/net/http/transport.go:636 +0x3c
created by net/http.(*Transport).getConn
    /home/rounin/go/src/pkg/net/http/transport.go:391 +0x70c
.
.
.
    /home/rounin/go/src/pkg/runtime/crash_test.go:62 +0x48
testing.tRunner(0x10762900, 0x278d9c, 0x0)
    /home/rounin/go/src/pkg/testing/testing.go:292 +0xac
created by testing.RunTests
    /home/rounin/go/src/pkg/testing/testing.go:368 +0x768
goroutine 38 [syscall]:
syscall.Syscall()
    /home/rounin/go/src/pkg/syscall/asm_linux_arm.s:14 +0x8
syscall.Read(0x4, 0x10f9c200, 0x200, 0x200, 0x400013a0, ...)
    /home/rounin/go/src/pkg/syscall/zsyscall_linux_arm.go:618 +0x84
os.(*File).read(0x107524b8, 0x10f9c200, 0x200, 0x200, 0xadbb4, ...)
    /home/rounin/go/src/pkg/os/file_unix.go:174 +0x64
os.(*File).Read(0x107524b8, 0x10f9c200, 0x200, 0x200, 0x0, ...)
    /home/rounin/go/src/pkg/os/file.go:95 +0xa0
bytes.(*Buffer).ReadFrom(0x10762d80, 0x10f90400, 0x107524b8, 0x0, 0x0, ...)
    /home/rounin/go/src/pkg/bytes/buffer.go:166 +0x2a8
io.Copy(0x10740ea0, 0x10762d80, 0x10f90400, 0x107524b8, 0x0, ...)
    /home/rounin/go/src/pkg/io/io.go:340 +0xc0
os/exec.func·003(0x107524a0, 0x107524a8, 0x25c90, 0x0, 0x196c90, ...)
    /home/rounin/go/src/pkg/os/exec/exec.go:201 +0x78
os/exec.func·004(0x10752478, 0x10700c40, 0x0)
    /home/rounin/go/src/pkg/os/exec/exec.go:268 +0x28
created by os/exec.(*Cmd).Start
    /home/rounin/go/src/pkg/os/exec/exec.go:269 +0x81c
FAIL    runtime 126.285s
?       runtime/cgo [no test files]
ok      runtime/debug   1.099s
ok      runtime/pprof   13.271s
ok      sort    3.910s
ok      strconv 50.203s
ok      strings 1.500s
ok      sync    2.424s
ok      sync/atomic 2.799s
ok      syscall 1.310s
?       testing [no test files]
?       testing/iotest  [no test files]
ok      testing/quick   2.386s
ok      text/scanner    1.044s
ok      text/tabwriter  1.040s
ok      text/template   1.913s
ok      text/template/parse 1.177s
ok      time    41.847s
ok      unicode 0.646s
ok      unicode/utf16   0.684s
ok      unicode/utf8    0.942s
?       unsafe  [no test files]
real    1501m42.253s
user    91m55.010s
sys 103m0.120s
rounin@LKG80B859:~/go/src$ exit
Script done on Tue 07 Aug 2012 19:00:11 BST
attached file build.go.txt

Attachments:

1. build.go.txt (191658 bytes)

[minux]

Comment 8:

Status changed to Duplicate.

Merged into issue #3381.

[davecheney]

Comment 9:

This issue was closed by revision 212ce41.

Status changed to Fixed.