[Bug go/65349] New: [5 Regression] go tool crashes, can't compile go code on 32bit linux systems

[doko at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65349

            Bug ID: 65349
           Summary: [5 Regression] go tool crashes, can't compile go code
                    on 32bit linux systems
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: go
          Assignee: ian at airs dot com
          Reporter: doko at gcc dot gnu.org
                CC: cmang at google dot com

The go command didn't ship with earlier GCC versions, so you may argue that it
is not a regression, however a go command backported from 1.2.2 was able to
build code with 4.9 on at least arm-linux-gnueabihf, powerpc-linux-gnu and
i686-linux-gnu.  Double-checked that the backported go command built with 5.0
shows the same failure.  This seems to work on architectures like
aarch64-linux-gnu, powerpc64le-linux-gnu and x86_64-linux-gnu.

On these architectures I see for "go -v 

on powerpc-linux-gnu (not on armhf and i386) building go-md2man
https://launchpad.net/ubuntu/+source/go-md2man/1-2ubuntu2

fatal error: freeing too small block

goroutine 16 [running]:
runtime_dopanic
        ../../../src/libgo/runtime/panic.c:131
runtime_throw
        ../../../src/libgo/runtime/panic.c:193
__go_free
        ../../../src/libgo/runtime/malloc.goc:354
__go_map_rehash
        ../../../src/libgo/runtime/go-map-index.c:66
__go_map_index
        ../../../src/libgo/runtime/go-map-index.c:120
main.$nested26
        ../../src/gotools/../libgo/go/cmd/go/main.go:565
filepath.walk
        ../../../src/libgo/go/path/filepath/path.go:347
filepath.walk
        ../../../src/libgo/go/path/filepath/path.go:372
path_filepath.Walk
        ../../../src/libgo/go/path/filepath/path.go:394
main.matchPackages
        ../../src/gotools/../libgo/go/cmd/go/main.go:544
main.allPackages
        ../../src/gotools/../libgo/go/cmd/go/main.go:481
main.importPaths
        ../../src/gotools/../libgo/go/cmd/go/main.go:329
main.packagesAndErrors
        ../../src/gotools/../libgo/go/cmd/go/pkg.go:902
main.packages
        ../../src/gotools/../libgo/go/cmd/go/pkg.go:883
main.runList
        ../../src/gotools/../libgo/go/cmd/go/list.go:175
main.main
        ../../src/gotools/../libgo/go/cmd/go/main.go:163
runtime_main
        ../../../src/libgo/runtime/proc.c:550
panic during panic

goroutine 16 [running]:
runtime_dopanic
        ../../../src/libgo/runtime/panic.c:131
runtime_startpanic
        ../../../src/libgo/runtime/panic.c:100
runtime_throw
        ../../../src/libgo/runtime/panic.c:191
runtime_mallocgc
        ../../../src/libgo/runtime/malloc.goc:116
__go_alloc
        ../../../src/libgo/runtime/malloc.goc:321
callback
        ../../../src/libgo/runtime/go-caller.c:50
dwarf_lookup_pc
        ../../../src/libbacktrace/dwarf.c:2838
dwarf_fileline
        ../../../src/libbacktrace/dwarf.c:2877
backtrace_pcinfo
        ../../../src/libbacktrace/fileline.c:176
__go_file_line
        ../../../src/libgo/runtime/go-caller.c:137
runtime_printcreatedby
        ../../../src/libgo/runtime/proc.c:613
runtime_dopanic
        ../../../src/libgo/runtime/panic.c:132
runtime_throw
        ../../../src/libgo/runtime/panic.c:193
__go_free
        ../../../src/libgo/runtime/malloc.goc:354
__go_map_rehash
        ../../../src/libgo/runtime/go-map-index.c:66
__go_map_index
        ../../../src/libgo/runtime/go-map-index.c:120
main.$nested26
        ../../src/gotools/../libgo/go/cmd/go/main.go:565
filepath.walk
        ../../../src/libgo/go/path/filepath/path.go:347
filepath.walk
        ../../../src/libgo/go/path/filepath/path.go:372
path_filepath.Walk
        ../../../src/libgo/go/path/filepath/path.go:394
main.matchPackages
        ../../src/gotools/../libgo/go/cmd/go/main.go:544
main.allPackages
        ../../src/gotools/../libgo/go/cmd/go/main.go:481
main.importPaths
        ../../src/gotools/../libgo/go/cmd/go/main.go:329
main.packagesAndErrors
        ../../src/gotools/../libgo/go/cmd/go/pkg.go:902
main.packages
        ../../src/gotools/../libgo/go/cmd/go/pkg.go:883
main.runList
        ../../src/gotools/../libgo/go/cmd/go/list.go:175
main.main
        ../../src/gotools/../libgo/go/cmd/go/main.go:163
runtime_main
        ../../../src/libgo/runtime/proc.c:550
stack trace unavailable


on powerpc building nuntium:

fatal error: freeing too small block

goroutine 16 [running]:
runtime_dopanic
        ../../../src/libgo/runtime/panic.c:131
runtime_throw
        ../../../src/libgo/runtime/panic.c:193
__go_free
        ../../../src/libgo/runtime/malloc.goc:354
__go_map_rehash
        ../../../src/libgo/runtime/go-map-index.c:66
__go_map_index
        ../../../src/libgo/runtime/go-map-index.c:120
main.$nested26
        ../../src/gotools/../libgo/go/cmd/go/main.go:565
filepath.walk
        ../../../src/libgo/go/path/filepath/path.go:347
filepath.walk
        ../../../src/libgo/go/path/filepath/path.go:372
path_filepath.Walk
        ../../../src/libgo/go/path/filepath/path.go:394
main.matchPackages
        ../../src/gotools/../libgo/go/cmd/go/main.go:544
main.allPackages
        ../../src/gotools/../libgo/go/cmd/go/main.go:481
main.importPaths
        ../../src/gotools/../libgo/go/cmd/go/main.go:329
main.packagesAndErrors
        ../../src/gotools/../libgo/go/cmd/go/pkg.go:902
main.packages
        ../../src/gotools/../libgo/go/cmd/go/pkg.go:883
main.runList
        ../../src/gotools/../libgo/go/cmd/go/list.go:175
main.main
        ../../src/gotools/../libgo/go/cmd/go/main.go:163
runtime_main
        ../../../src/libgo/runtime/proc.c:550
panic during panic

goroutine 16 [running]:
runtime_dopanic
        ../../../src/libgo/runtime/panic.c:131
runtime_startpanic
        ../../../src/libgo/runtime/panic.c:100
runtime_throw
        ../../../src/libgo/runtime/panic.c:191
runtime_mallocgc
        ../../../src/libgo/runtime/malloc.goc:116
__go_alloc
        ../../../src/libgo/runtime/malloc.goc:321
callback
        ../../../src/libgo/runtime/go-caller.c:50
dwarf_lookup_pc
        ../../../src/libbacktrace/dwarf.c:2838
dwarf_fileline
        ../../../src/libbacktrace/dwarf.c:2877
backtrace_pcinfo
        ../../../src/libbacktrace/fileline.c:176
__go_file_line
        ../../../src/libgo/runtime/go-caller.c:137
runtime_printcreatedby
        ../../../src/libgo/runtime/proc.c:613
runtime_dopanic
        ../../../src/libgo/runtime/panic.c:132
runtime_throw
        ../../../src/libgo/runtime/panic.c:193
__go_free
        ../../../src/libgo/runtime/malloc.goc:354
__go_map_rehash
        ../../../src/libgo/runtime/go-map-index.c:66
__go_map_index
        ../../../src/libgo/runtime/go-map-index.c:120
main.$nested26
        ../../src/gotools/../libgo/go/cmd/go/main.go:565
filepath.walk
        ../../../src/libgo/go/path/filepath/path.go:347
filepath.walk
        ../../../src/libgo/go/path/filepath/path.go:372
path_filepath.Walk
        ../../../src/libgo/go/path/filepath/path.go:394
main.matchPackages
        ../../src/gotools/../libgo/go/cmd/go/main.go:544
main.allPackages
        ../../src/gotools/../libgo/go/cmd/go/main.go:481
main.importPaths
        ../../src/gotools/../libgo/go/cmd/go/main.go:329
main.packagesAndErrors
        ../../src/gotools/../libgo/go/cmd/go/pkg.go:902
main.packages
        ../../src/gotools/../libgo/go/cmd/go/pkg.go:883
main.runList
        ../../src/gotools/../libgo/go/cmd/go/list.go:175
main.main
        ../../src/gotools/../libgo/go/cmd/go/main.go:163
runtime_main
        ../../../src/libgo/runtime/proc.c:550
stack trace unavailable