Re: [gentoo-user] How to get a backtrace from a core dump?

Nikos Chantziaras <realnc@×××××.de> [10-01-27 17:09]:
> I need to get a backtrace from a core dump file.  I followed the
> instructions here:
>
>   http://www.gentoo.org/proj/en/qa/backtraces.xml
>
> I added -g to CFLAGS and splitdebug to FEATURES and built the
> application with those new setting (that would be media-sound/lmms in
> this case.)  I then did "ulimit -c unlimited" and started the
> application from that shell.  I reproduced the crash and a core file
> was successfully produced.  But, when trying to get a backtrace, I get:
>
> --------
> gdb --core core --batch --quiet -ex "thread apply all bt full" -ex
> "quit"
> [New Thread 3575]
> [New Thread 3573]
> [New Thread 3577]
> Core was generated by `./lmms'.
> Program terminated with signal 11, Segmentation fault.
> #0  0x0000003007b79985 in ?? ()
>
> Thread 4 (Thread 3577):
> #0  0x0000003000c0e07d in ?? ()
> No symbol table info available.
>
> Thread 3 (Thread 3573):
> #0  0x0000003000c0b1fc in ?? ()
> No symbol table info available.
>
> Thread 2 (Thread 3575):
> #0  0x000000306d44feac in ?? ()
> No symbol table info available.
>
> Thread 1 (Thread 3571):
> #0  0x0000003007b79985 in ?? ()
> No symbol table info available.
> --------
>
> Then I re-emerged the application, canceled the emerge and did a manual
> "make" in /var/tmp/portage so I get the unstripped lmms executable.
> However, same thing as above happens.  What am I missing?
>

Hi,

you need to build all librarys, which are linked to that application
as with debug option, too.

Best regards,
mcc

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