Playing songs suddenly hangs, cannot restart it without restarting software

[Cysioland]

Description of problem:
When you play songs with Mixxx and stream to Icecast 2, it plays for a while,
and then hangs. Decks stop spinning, cannot play anything, must restart Mixxx
to return.

Version-Release number of selected component (if applicable):
1.11.0

How reproducible:
I don't know, maybe it's only my machine issue.

Steps to Reproduce:
1. Connect to Icecast 2 server.
2. Play some music, fiddle with controls, load up samplers, etc.
3. Wait few seconds – few minutes.
4. Order the music list by Title or other.
5. BUG!

Actual results:
Playing songs hang. Decks stop spinning, cannot play anything, must restart
Mixxx to return.

Expected results:
Songs are playing flawlessy, without hangs.

Additional info:
Installed on Fedora 19 via RPMFusion, guys from its Bugzilla asked me to report this also here, original bug: https://bugzilla.rpmfusion.org/show_bug.cgi?id=3074

[Owen Williams (ywwg)]

What audio hardware are you using? Also, can you attach the contents of a log from a run where it hung? The log is in ~/.mixxx/mixxx.log

[Cysioland (cysioland)]

I'm using Sweex 7.1 USB sound card via Pulseaudio. This appeared in console when it crashed:

ALSA lib pcm.c:7843:(snd_pcm_recover) underrun occurred
Expression 'err' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 3315
Expression 'ContinuePoll( self, StreamDirection_In, &pollTimeout, &pollCapture
)' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 3847
Expression 'PaAlsaStream_WaitForFrames( stream, &framesAvail, &xrun )' failed
in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4219

[Owen Williams (ywwg)]

That's helpful, but we also really need the mixxx.log

[RJ Skerry-Ryan (rryan)]

My suspicion is that we deadlocked our master thread on the sidechain thread by locking the double-buffer for communicating with the sidechain. That matches all the observations (ALSA throwing a hissy fit, all decks stopping, use of icecast, etc.)

[RJ Skerry-Ryan (rryan)]

(And if that is true then this is fixed since the sidechain is no longer a double-buffered mutex approach due to Bug #1179027 )

[RJ Skerry-Ryan (rryan)]

Cysioland -- I think the mystery might be solved if you could follow the instructions here to get a backtrace:

http://mixxx.org/wiki/doku.php/creating_backtraces

Thanks!

[RJ Skerry-Ryan (rryan)]

Critical importance, marked incomplete since we are waiting on info from Cysioland.

[Daniel Schürmann (daschuer)]

Maybe I see the same issue here:

Maybe this is the same issue like this:
https://bugs.launchpad.net/mixxx/+bug/1310553

[Daniel Schürmann (daschuer)]

@ricktonycr: Which version of Mixxx did you use? We have recently made some changes in broadcast engine. Does the problem still exist in the latest 2.1 alpha:
https://launchpad.net/~nschloe/+archive/ubuntu/mixxx-nightly

[Daniel Schürmann (daschuer)]

Closing it now because of no responds.

[Swiftb0y (swiftb0y)]

Mixxx now uses GitHub for bug tracking. This bug has been migrated to:
https://github.com/mixxxdj/mixxx/issues/7231