libSegFault.so crashing on Daisy

libSegFault.so crashing on Daisy

[Daniel.]

Hi everybody,

I was trying to use libSegFault.so to capture stacktraces but the
libSegFault it self is crashing? Can someone try to reproduce this?

1) Install libc6-dbg. This will give you access to libSegFault.so at
/lib/.debug/libSegFault.so
2) Set LD_PRELOAD: export LD_PRELOAD=/lib/.debug/libSegFault.so
3) Running any executable results in a crash for me :/

root@localhost:/media/card2# export LD_PRELOAD=/lib/.debug/libSegFault.so
root@localhost:/media/card2# ls
Segmentation fault (core dumped)
root@localhost:/media/card2#

The core dump gives-me this backtrace:
#0  _dl_relocate_object (scope=0x76fc2898, reloc_mode=1,
consider_profiling=consider_profiling@entry=0) at dl-reloc.c:238
#1  0x76fa1428 in dl_main (phdr=<optimized out>, phnum=<optimized
out>, user_entry=<optimized out>, auxv=<optimized out>) at rtld.c:2204
#2  0x76fb4418 in _dl_sysdep_start
(start_argptr=start_argptr@entry=0x7eb39cf0, dl_main=0x0) at
../elf/dl-sysdep.c:249
#3  0x76fa2cc0 in _dl_start_final (arg=0x7eb39cf0, arg@entry=0x0,
info=0x7eb39a70, info@entry=0x7eb39a68) at rtld.c:332
#4  0x76fa2f50 in _dl_start (arg=0x0) at rtld.c:560
#5  0x76f9ed50 in _start () from /lib/ld-linux-armhf.so.3
#6  0x76f9ed50 in _start () from /lib/ld-linux-armhf.so.3

I'm on ARMv7, i.MX6q


Regards,

-- 
"Do or do not. There is no try"
  Yoda Master

Re: libSegFault.so crashing on Daisy

[Richard Purdie]

On Fri, 2016-09-02 at 16:36 -0300, Daniel. wrote:
> Hi everybody,
> 
> I was trying to use libSegFault.so to capture stacktraces but the
> libSegFault it self is crashing? Can someone try to reproduce this?
> 
> 1) Install libc6-dbg. This will give you access to libSegFault.so at
> /lib/.debug/libSegFault.so
> 2) Set LD_PRELOAD: export LD_PRELOAD=/lib/.debug/libSegFault.so
> 3) Running any executable results in a crash for me :/

I suspect you want a /lib/libSegFault.so rather than the file in a
.debug directory since the .debug version is just the debug symbols.
Try the libsegfault package itself?

Cheers,

Richard

Re: libSegFault.so crashing on Daisy

[Daniel.]

Ohhh you may be right, I'll try it

Thanks Richard!

2016-09-04 19:18 GMT-03:00 Richard Purdie <richard.purdie@linuxfoundation.org>:
> On Fri, 2016-09-02 at 16:36 -0300, Daniel. wrote:
>> Hi everybody,
>>
>> I was trying to use libSegFault.so to capture stacktraces but the
>> libSegFault it self is crashing? Can someone try to reproduce this?
>>
>> 1) Install libc6-dbg. This will give you access to libSegFault.so at
>> /lib/.debug/libSegFault.so
>> 2) Set LD_PRELOAD: export LD_PRELOAD=/lib/.debug/libSegFault.so
>> 3) Running any executable results in a crash for me :/
>
> I suspect you want a /lib/libSegFault.so rather than the file in a
> .debug directory since the .debug version is just the debug symbols.
> Try the libsegfault package itself?
>
> Cheers,
>
> Richard



-- 
"Do or do not. There is no try"
  Yoda Master