[Bug go/68496] [libgo] reflect test fails on Linux x86-64

["ismail at i10z dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68496

--- Comment #2 from Äsmail DÃnmez <ismail at i10z dot com> ---
(In reply to Ian Lance Taylor from comment #1)
> I can not recreate this problem.  It works fine for me.
> 
> The stack trace is incomplete for some reason so I don't know what is going
> wrong.
> 
> If you cd into x86_64-pc-linux-gnu/libgo, you can run
>     make GOTESTFLAGS="--keep" reflect/check
> Presumably that will fail.  It will leave behind a gotestNNNN directory.  In
> that directory you will find an a.out executable.  Running that executable
> runs the test (you may have to set LD_LIBRARY_PATH so that it finds
> libgo.so).  Try running that executable under gdb and see if you can get a
> better backtrace.

Try export MALLOC_CHECK_=2 before testing. Backtrace shows an invalid free:

(gdb) bt
#0  0x00007f8d36c51d38 in __GI_raise (sig=sig@entry=6) at
../sysdeps/unix/sysv/linux/raise.c:55
#1  0x00007f8d36c5318a in __GI_abort () at abort.c:78
#2  0x00007f8d36c960b0 in malloc_printerr (action=<optimized out>,
str=0x7f8d36d840fa "free(): invalid pointer", ptr=<optimize
d out>, ar_ptr=<optimized out>) at malloc.c:5004
#3  0x0000000000433298 in reflect.call.N13_reflect.Value
(pointer=pointer@entry=0xc2080c56a0, op=..., param=...) at value.go:4
50
#4  0x00000000004328d4 in reflect.Call.N13_reflect.Value
(pointer=pointer@entry=0x7f8d33da0c40, in=...) at value.go:300
#5  0x000000000044ec3a in reflect_test.TestCallWithStruct (t=<optimized out>)
at all_test.go:1492
#6  0x00007f8d37e6f71c in testing.tRunner (test=0xc20807a318, param=<optimized
out>) at ../../../libgo/go/testing/testing.go:4
55
#7  testing.$thunk15 (__go_thunk_parameter=<optimized out>) at
../../../libgo/go/testing/testing.go:560
#8  0x00007f8d37d8fa9c in kickoff () at ../../../libgo/runtime/proc.c:235
#9  0x00007f8d3812a135 in __morestack () at
../../../libgcc/config/i386/morestack.S:544
#10 0x00007f8d36c62900 in ?? () from /lib64/libc.so.6
#11 0x0000000000000000 in ?? ()