runtime $ gdb gopack
GNU gdb 6.8
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
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This GDB was configured as "arm-none-linux-gnueabi"...
(gdb) run grc _obj/runtime.a _go_.5 asm.5 cgocall.5 chan.5 closure.5 float.5 hashmap.5 iface.5 malloc.5 mcache.5 mcentral.5 mem.5 mfixalloc.5 mgc0.5 mheap.5 mheapmap32.5 msize.5 print.5 proc.5 reflect.5 rune.5 runtime.5 rt0.5 sema.5 signal.5 slice.5 string.5 symtab.5 sys.5 thread.5 traceback.5 cas.5 memset.5 vlop.5 vlrt.5
Starting program: /mnt/ext/home/bzhou/bin/gopack grc _obj/runtime.a _go_.5 asm.5 cgocall.5 chan.5 closure.5 float.5 hashmap.5 iface.5 malloc.5 mcache.5 mcentral.5 mem.5 mfixalloc.5 mgc0.5 mheap.5 mheapmap32.5 msize.5 print.5 proc.5 reflect.5 rune.5 runtime.5 rt0.5 sema.5 signal.5 slice.5 string.5 symtab.5 sys.5 thread.5 traceback.5 cas.5 memset.5 vlop.5 vlrt.5

Program received signal SIGSEGV, Segmentation fault.
0x4009c538 in strcmp () from /lib/libc.so.6
(gdb) bt
#0  0x4009c538 in strcmp () from /lib/libc.so.6
#1  0x00009c68 in duplicate (name=0x5b188 "breakpoint", ofile=0xbedd3eec) at /mnt/ext/home/bzhou/go/src/cmd/gopack/ar.c:801
#2  0x00009d64 in objsym (s=0x28ad8, p=0x26008) at /mnt/ext/home/bzhou/go/src/cmd/gopack/ar.c:760
#3  0x0000c43c in objtraverse (fn=0x9cb8 <objsym>, pointer=0x26008) at /mnt/ext/home/bzhou/go/src/libmach/obj.c:317
#4  0x0000b560 in scanobj (b=0x26038, ap=0x26008, size=<value optimized out>) at /mnt/ext/home/bzhou/go/src/cmd/gopack/ar.c:625
#5  0x0000bf94 in rcmd (arname=0x26 <Address 0x26 out of bounds>, count=35, files=0xbedd4120)
    at /mnt/ext/home/bzhou/go/src/cmd/gopack/ar.c:361
#6  0x0000a18c in p9main (argc=35, argv=0xbedd4114) at /mnt/ext/home/bzhou/go/src/cmd/gopack/ar.c:246
#7  0x0000ea50 in main (argc=0, argv=0x5b188) at /mnt/ext/home/bzhou/go/src/lib9/main.c:35
(gdb)