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segmentation fault with mocp. How to find out why?
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Banana
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PostPosted: Fri Mar 29, 2024 11:09 am    Post subject: segmentation fault with mocp. How to find out why? Reply with quote

I'm using https://packages.gentoo.org/packages/media-sound/moc for a long time now and after the re-emerge of world from the profile update it gets a segmentation fault right after the start.

Code:
❯ mocp
Segmentation fault


Code:
[   71.267631] mocp[3682]: segfault at 55cb3e9f0000 ip 000055cb3e8fe400 sp 00007fff3b2161b0 error 4 in mocp[55cb3e8f5000+3f000] likely on CPU 4 (core 4, socket 0)


Code:
media-sound/moc-2.6_alpha3-r6::gentoo  USE="aac alsa cache debug flac mad magic musepack unicode vorbis wavpack -curl -ffmpeg -jack -libsamplerate -modplug -oss -sid -sndfile -sndio -speex -timidity -tremor" 0 KiB


how and where to look to get this solved?


emerge info: https://delta-labs.org/sp/HaY
complete dmesg: https://delta-labs.org/sp/CSc
installed info about mocp: https://delta-labs.org/sp/Cy4
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Hu
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PostPosted: Fri Mar 29, 2024 2:55 pm    Post subject: Reply with quote

I suggest that you try debugging it, and obtaining a backtrace of where it crashes. Once we know that, we can examine the code to understand why it is wrong.
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Banana
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PostPosted: Sat Mar 30, 2024 9:31 am    Post subject: Reply with quote

Thx hu.

Code:
❯ gdb -q mocp
Reading symbols from mocp...
Reading symbols from /usr/lib/debug//usr/bin/mocp.debug...
(gdb) run
Starting program: /usr/bin/mocp
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib64/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
clone_popt_options (opts=opts@entry=0x5555555bb120 <mocp_opts>) at main.c:699
warning: 699   main.c: No such file or directory
(gdb) set logging file backtrace.log
(gdb) set logging on
Warning: 'set logging on', an alias for the command 'set logging enabled', is deprecated.
Use 'set logging enabled on'.

Copying output to backtrace.log.
Copying debug output to backtrace.log.
(gdb) bt
#0  clone_popt_options (opts=opts@entry=0x5555555bb120 <mocp_opts>) at main.c:699
#1  0x00005555555698aa in render_popt_command_line () at main.c:825
#2  0x0000555555562746 in log_popt_command_line () at main.c:1168
#3  main (argc=<optimized out>, argv=<optimized out>) at main.c:1224
(gdb) set logging off
Warning: 'set logging off', an alias for the command 'set logging enabled', is deprecated.
Use 'set logging enabled off'.

Done logging to backtrace.log.
(gdb) quit
A debugging session is active.

   Inferior 1 [process 13613] will be killed.

Quit anyway? (y or n) y

~ took 1m58s
❯ ls


backtrace log: https://delta-labs.org/sp/HBE
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