cmd/compile: panic on linux/mips64le during build with Go 1.6.2 in QEMU

[vanloswang]

Please answer these questions before submitting your issue. Thanks!

1. What version of Go are you using (go version)?
   go version go1.6.2 linux/mips64le

2. What operating system and processor architecture are you using (go env)?
   GOARCH="mips64le"
   GOBIN=""
   GOEXE=""
   GOHOSTARCH="mips64le"
   GOHOSTOS="linux"
   GOOS="linux"
   GOPATH=""
   GORACE=""
   GOROOT="/usr/lib/golang"
   GOTOOLDIR="/usr/lib/golang/pkg/tool/linux_mips64le"
   GO15VENDOREXPERIMENT="1"
   CC="gcc"
   GOGCCFLAGS="-fPIC -fmessage-length=0"
   CXX="g++"
   CGO_ENABLED="0"

3. What did you do?
   Just compile golang on fedora 23 mips64el, which is based on QEMU melta 5KEc.

4. What did you expect to see?
   Compile success.

5. What did you see instead?

   rpmbuild --define "golang_arches mips64el" -bb golang-1.6.2.spec

   Executing(%prep): /bin/sh -e /var/tmp/rpm-tmp.s5c1s4

6. umask 022

7. cd /root/rpmbuild/BUILD

8. cd /root/rpmbuild/BUILD

9. rm -rf go

10. /usr/bin/gzip -dc /root/rpmbuild/SOURCES/go1.6.2.tar.gz

11. /usr/bin/tar -xof -

12. STATUS=0

13. '[' 0 -ne 0 ']'

14. cd go

15. /usr/bin/chmod -Rf a+rX,u+w,g-w,o-w .

16. exit 0
    Executing(%build): /bin/sh -e /var/tmp/rpm-tmp.LjhtJ8

17. umask 022

18. cd /root/rpmbuild/BUILD

19. cd go

20. uname -a
    Linux fedora-mips64el 4.4.0-0.rc4.git0.1.mips.fc23.mips64el cmd/cgo: fails with gcc 4.4.1 #1 Fri Dec 18 08:53:44 GMT 2015 mips64 mips64 mips64 GNU/Linux

21. cat /proc/cpuinfo
    system type : MIPS Malta
    machine : mti,malta
    processor : 0
    cpu model : MIPS 5KE V0.0
    BogoMIPS : 2801.66
    wait instruction : yes
    microsecond timers : yes
    tlb_entries : 32
    extra interrupt vector : yes
    hardware watchpoint : yes, count: 1, address/irw mask: [0x0ff8]
    isa : mips1 mips2 mips3 mips4 mips5 mips32r1 mips32r2 mips64r1 mips64r2
    ASEs implemented :
    shadow register sets : 1
    kscratch registers : 0
    package : 0
    core : 0
    VCED exceptions : not available
    VCEI exceptions : not available

• cat /proc/meminfo
  MemTotal: 2015436 kB
  MemFree: 380420 kB
  MemAvailable: 1864000 kB
  Buffers: 91896 kB
  Cached: 1305964 kB
  SwapCached: 0 kB
  Active: 682032 kB
  Inactive: 781152 kB
  Active(anon): 65596 kB
  Inactive(anon): 136 kB
  Active(file): 616436 kB
  Inactive(file): 781016 kB
  Unevictable: 0 kB
  Mlocked: 0 kB
  SwapTotal: 0 kB
  SwapFree: 0 kB
  Dirty: 63112 kB
  Writeback: 0 kB
  AnonPages: 65336 kB
  Mapped: 49764 kB
  Shmem: 412 kB
  Slab: 160164 kB
  SReclaimable: 107032 kB
  SUnreclaim: 53132 kB
  KernelStack: 1248 kB
  PageTables: 1284 kB
  NFS_Unstable: 0 kB
  Bounce: 0 kB
  WritebackTmp: 0 kB
  CommitLimit: 1007716 kB
  Committed_AS: 213152 kB
  VmallocTotal: 1069547512 kB
  VmallocUsed: 0 kB
  VmallocChunk: 0 kB
  AnonHugePages: 18432 kB
  HugePages_Total: 0
  HugePages_Free: 0
  HugePages_Rsvd: 0
  HugePages_Surp: 0
  Hugepagesize: 2048 kB
• export GOROOT_BOOTSTRAP=/usr/lib/golang
• GOROOT_BOOTSTRAP=/usr/lib/golang
• export GOROOT_FINAL=/usr/lib/golang
• GOROOT_FINAL=/usr/lib/golang
• export GOHOSTOS=linux
• GOHOSTOS=linux
• export GOHOSTARCH=mips64le
• GOHOSTARCH=mips64le
• pushd src
  ~/rpmbuild/BUILD/go/src ~/rpmbuild/BUILD/go
• export 'CFLAGS=-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -march=mips64r2 -mabi=64'
• CFLAGS='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -march=mips64r2 -mabi=64'
• export 'LDFLAGS=-Wl,-z,relro -specs=/usr/lib/rpm/redhat/redhat-hardened-ld'
• LDFLAGS='-Wl,-z,relro -specs=/usr/lib/rpm/redhat/redhat-hardened-ld'
• export CC=gcc
• CC=gcc
• export CC_FOR_TARGET=gcc
• CC_FOR_TARGET=gcc
• export GOOS=linux
• GOOS=linux
• export GOARCH=mips64le
• GOARCH=mips64le
• export 'GO_LDFLAGS=-linkmode internal'
• GO_LDFLAGS='-linkmode internal'
• export CGO_ENABLED=0
• CGO_ENABLED=0
• ./make.bash --no-clean

  Building Go bootstrap tool.

  cmd/dist

Building Go toolchain using /usr/lib/golang.

bootstrap/internal/obj
bootstrap/internal/obj/arm
bootstrap/internal/obj/arm64
bootstrap/internal/obj/mips
bootstrap/internal/obj/ppc64
bootstrap/internal/obj/x86
bootstrap/asm/internal/arch
bootstrap/asm/internal/flags
bootstrap/asm/internal/lex
bootstrap/asm/internal/asm
bootstrap/asm
bootstrap/compile/internal/big
bootstrap/internal/gcprog
bootstrap/compile/internal/gc
bootstrap/compile/internal/amd64
bootstrap/compile/internal/arm
bootstrap/compile/internal/arm64
bootstrap/compile/internal/mips64
bootstrap/compile/internal/ppc64
bootstrap/compile/internal/x86
bootstrap/compile
bootstrap/link/internal/ld
bootstrap/link/internal/amd64
bootstrap/link/internal/arm
bootstrap/link/internal/arm64
bootstrap/link/internal/mips64
bootstrap/link/internal/ppc64
bootstrap/link/internal/x86
bootstrap/link

Building go_bootstrap for host, linux/mips64le.

runtime/internal/sys
runtime/internal/atomic
runtime
encoding
errors
internal/race
internal/syscall/windows/sysdll
math
sort
sync/atomic
unicode
unicode/utf16
unicode/utf8
sync
container/heap
internal/singleflight
io
syscall
hash
hash/adler32
strings
bytes
strconv
bufio
path
regexp/syntax
reflect
encoding/base64
crypto
crypto/sha1
internal/syscall/windows/registry
internal/syscall/windows
time
regexp
os
encoding/binary
path/filepath
fmt
os/signal
/ioutil
os/exec
debug/dwarf
go/token
flag
log
text/template/parse
net/url
compress/flate
encoding/json
go/scanner
go/ast
compress/zlib
text/template
debug/elf
debug/macho
go/parser
go/doc
go/build
cmd/go

Building packages and commands for linux/mips64le.

panic: regexp: Compile(((https?|ftp|file|gopher|mailto|news|nntp|telnet|wais|prospero)://[a-zA-Z0-9_@\-]+([.:][a-zA-Z0-9_@\-]+)*/?[a-zA-Z0-9_?%#~&/\-+=()]+([:.,][a-zA-Z0-9_?%#~&/\-+=()]+)*)|([\pL_][\pL_0-9]*)): error parsing regexp: invalid escape sequence: \-

goroutine 1 [running]:
panic(0x3434c0, 0xc82000e5a0)
/usr/lib/golang/src/runtime/panic.go:481 +0x4b8
regexp.MustCompile(0x4bb7e0, 0xb9, 0x4655e0)
/usr/lib/golang/src/regexp/regexp.go:232 +0x17c
go/doc.init()
/usr/lib/golang/src/go/doc/comment.go:59 +0x108
go/build.init()
/usr/lib/golang/src/go/build/syslist.go:8 +0xc4
main.init()
/usr/lib/golang/src/cmd/go/zdefaultcc.go:6 +0xdc
error: Bad exit status from /var/tmp/rpm-tmp.LjhtJ8 (%build)

RPM build errors:
Bad exit status from /var/tmp/rpm-tmp.LjhtJ8 (%build)

[vanloswang]

@minux @eswierk @cherrymui

[vanloswang]

@eswierk @cherrymui
I tried golang source code from skyportsystem, report the same error.

[cherrymui]

Can't reproduce it on my machine. Do you see it only on when building rpm?

It seems you have a working go1.6.2 from /usr/lib/golang. If you rebuild it, does it work?

[vanloswang]

@cherrymui test it again the original golang 1.6.2 can compile ok, but with your patch for externel cgo link support, it report such an error on qemu emulated mips64el machine. On my physical machine it nerver report the error and works well. So many thx to you. Could you debug it out?

[vanloswang]

@cherrymui maybe the new relocation does not adapt to the qemu emulated machine?

[rsc]

It sounds like this is a QEMU problem. Leaving for Go 1.8.

[rsc]

@vanloswang is this still a problem with newer versions of Go?

[vanloswang]

@rsc I will test it with fedora 24 mips64le and golang 1.7.3 during this weekend.