| Summary: | PulseAudio 10 crashes immediately when needed (dummy output): Assertion 'pthread_mutex_unlock(&m->mutex) == 0 | ||
|---|---|---|---|
| Product: | PulseAudio | Reporter: | erhard_f |
| Component: | core | Assignee: | pulseaudio-bugs |
| Status: | RESOLVED NOTOURBUG | QA Contact: | pulseaudio-bugs |
| Severity: | normal | ||
| Priority: | medium | CC: | lennart |
| Version: | unspecified | ||
| Hardware: | PowerPC | ||
| OS: | Linux (All) | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Attachments: |
PulseAudio logfile
coredump of mpv concerning pulseaudio 0001-mutex-posix-log-unlock-failure-reason.patch PulseAudio logfile after applying 0001 patch PulseAudio logfile after applying 0001 patch (dummy output) 132211: PulseAudio logfile after applying 0001 patch (dummy output) mpv verbose output |
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Created attachment 132060 [details]
coredump of mpv concerning pulseaudio
(In reply to erhard_f from comment #0) > Anytime when I start an application which relies on PulseAudio it crashes > immediately. Is this specific to mpv, or are multiple applications crashing in the same way? The crash could be due to mpv calling pa_threaded_mainloop_unlock() when the thread doesn't hold the mainloop lock. Another reason could be that mpv is linked to libpthread-stubs instead of the normal libpthread implementation. libpthread-stubs has been the reason for mutex failures in several occasions. What does this command print: ldd `which mpv` | grep pthread I'll attach a patch that should make the crash log a bit more informative. Can you try it out? Created attachment 132086 [details] [review] 0001-mutex-posix-log-unlock-failure-reason.patch This is not specific to mpv, multiple applications are crashing this way, e.g. Extreme Tux Racer. When etr is compiled without alsa/pulse it just starts normally. $ ldd `which mpv` | grep pthread libpthread.so.0 => /lib/libpthread.so.0 (0x0e45b000) I will try to apply your patch an report back in the next few days. Thanks! Created attachment 132210 [details]
PulseAudio logfile after applying 0001 patch
Ok, back on track. Sorry it took me that long. Oops, just realized the logfile I uploaded was generated while the nonworking "snd-aoa-codec-onyx" driver was in use. I'll upload a new logfile with PulseAudion dummy output/no card again. Created attachment 132211 [details]
PulseAudio logfile after applying 0001 patch (dummy output)
Created attachment 132212 [details]
132211: PulseAudio logfile after applying 0001 patch (dummy output)
Can you attach the output from mpv? The log message that my patch adds won't be visible in the server log, it will be shown just before the assertion error in the client output. Also, use "LANG=C mpv /media/somevideo.mkv" when starting mpv so that the error message will be in English. Created attachment 132733 [details]
mpv verbose output
Sorry for the delay. Attatched please find mpv's verbose output. Sorry for the delay on my part also. So the error was "Operation not permitted". That means that a thread tried to unlock a mutex that it hadn't locked previously. Are you familiar with getting backtraces with gdb? mpv's pulse output is working fine for me, and finding the exact code that fails requires a backtrace. There are some instructions here (but instead of running pulseaudio inside gdb, you need to run mpv inside gdb): https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/Community/ In the meantime I rebuilt the whole system based on gcc 6.3, binutils 2.28, glibc 2.24. Interestingly enough I can't reproduce the bug any longer, pulseaudio happily works as expected on my G5! Sorry for the noise! |
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Created attachment 132059 [details] PulseAudio logfile Don't know if this is platform specific, but maybe not. System is a PowerMac G5, I am running MATE 1.18. There is no sound card configured as there is no working device driver. Pulseaudio is configured for 'dummy output'. Anytime when I start an application which relies on PulseAudio it crashes immediately. No sound output is of course ok, if I configured dummy output, but if I can't use an application at all due to a crashing PulseAudion this is not so good... Goes like that: mpv /media/somevideo.mkv Playing: /media/somevideo.mkv (+) Video --vid=1 (*) (h264) (+) Audio --aid=1 --alang=eng (*) 'Stereo' (ac3) Audio --aid=2 --alang=ger 'Stereo' (ac3) Subs --sid=1 --slang=ger (dvd_subtitle) Subs --sid=2 --slang=eng (dvd_subtitle) File tags: Title: DVD_VIDEO Assertion 'pthread_mutex_unlock(&m->mutex) == 0' failed at /var/tmp/portage/media-sound/pulseaudio-10.0/work/pulseaudio-10.0/src/pulsecore/mutex-posix.c:108, function pa_mutex_unlock(). Aborting. Abgebrochen (Speicherabzug geschrieben) Sound modules loaded: $ lsmod | grep -i snd snd_aoa_i2sbus 23044 0 snd_pcm 98700 1 snd_aoa_i2sbus snd_aoa_soundbus 4612 1 snd_aoa_i2sbus snd_timer 28360 1 snd_pcm snd_aoa 16888 0 snd 63656 4 snd_aoa_i2sbus,snd_timer,snd_pcm,snd_aoa soundcore 1544 1 snd No ALSA-card configured, PulseAudeo set to dummy output, rest is default config.