What steps will reproduce the problem?

make -C $GOROOT/src/pkg/runtime test

What is the expected output?

Tests pass

What do you see instead?

make: Entering directory `/home/dfc/go/src/pkg/runtime'
gotest
rm -f _test/runtime.a
rm -f _test/runtime.a
gopack grc _test/runtime.a _gotest_.5 asm.5 atomic.5 cgocall.5 chan.5 closure.5
cpuprof.5 float.5 complex.5 hashmap.5 iface.5 malloc.5 mcache.5 mcentral.5 mem.5
memmove.5 mfinal.5 mfixalloc.5 mgc0.5 mheap.5 mprof.5 msize.5 print.5 proc.5 rune.5
runtime.5 runtime1.5 rt0.5 sema.5 signal.5 sigqueue.5 slice.5 string.5 symtab.5 sys.5
thread.5 traceback.5 memset.5 softfloat.5 vlop.5 vlrt.5
unexpected fault address 0xd7801088
throw: fault
[signal 0xb code=0x1 addr=0xd7801088 pc=0x15aec]

goroutine 3 [running]:
/home/dfc/go/src/pkg/runtime/_xtest_.TestChanSendInterface()
        /home/dfc/go/src/pkg/runtime/chan_test.go:23 +0x1e0
testing.tRunner(0x106171a0, 0x16749c, 0x0)
        /home/dfc/go/src/pkg/testing/testing.go:156 +0x34
created by testing.RunTests
        /home/dfc/go/src/pkg/testing/testing.go:200 +0x554

goroutine 1 [chan receive]:
testing.RunTests(0x10c00, 0x167490, 0x7)
        /home/dfc/go/src/pkg/testing/testing.go:201 +0x570
testing.Main(0x10c00, 0x167490, 0x7, 0x7, 0x16dd90, ...)
        /home/dfc/go/src/pkg/testing/testing.go:168 +0x58
main.main()
        /home/dfc/go/src/pkg/runtime/_testmain.go:63 +0x68
gotest: "./5.out" failed: exit status 2
make: *** [test] Error 2
make: Leaving directory `/home/dfc/go/src/pkg/runtime'

Which compiler are you using (5g, 6g, 8g, gccgo)?

5g

Which operating system are you using?

stora(~/go/src) % uname -a
Linux stora.local 2.6.34-rc2-g85354d2 #1 PREEMPT Fri Mar 26 07:21:32 PDT 2010 armv5tel
GNU/Linux

Which revision are you using?  (hg identify)

stora(~/go/src) % hg identify
978acc122f2e+ tip

Please provide any additional information below.

root@stora:~# dmesg | tail -n1
Alignment trap: 5.out (25893) PC=0x000176d0 Instr=0xe5812000 Address=0x1061a072 FSR 0x801

stora(~/go/src/pkg/runtime) % gdb 5.out 
GNU gdb (GDB) 7.3-debian
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>;
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "arm-linux-gnueabi".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>;...
Reading symbols from /home/dfc/go/src/pkg/runtime/5.out...(no debugging symbols
found)...done.
(gdb) r
Starting program: /home/dfc/go/src/pkg/runtime/5.out 

Program received signal SIGSEGV, Segmentation fault.
0x00015aec in runtime.xchg ()