pulseaudio crash using module-combine and usb sound

I have a similar setup; I've also seen Pulse crash under similar conditions with malloc()-trashing-related explosions, although I can't seem to reproduce it reliably enough to paste one.

This should be fixed in jaunty; please reproduce.

I experienced this problem, too, using the same setup.

Installing Pulseaudio 0.9.13 fixed it for me (there is a Jaunty-Backport for Intrepid here: https://launchpad.net/~racb/+archive ).
Before installing it, please understand that installing from an external package-source is on your own risk.

Confirm on Kubuntu Intrepid AMD64 with playing audio on A2DP Bluetooth device:

I: sink-input.c: Created input 4 "Simultaneous output on ALSA PCM on bluetooth (bluetooth) via DMA" on alsa_output.bluetooth with sample spec s16le 6ch48000Hz and channel map front-left,side-left,front-center,front-right,side-right,lfe
I: module-alsa-sink.c: Starting playback.
E: module-combine.c: Assertion '!op->outq_rtpoll_item' failed at modules/module-combine.c:584, function sink_process_msg(). Aborting.

Upgrading to 0.9.13 (from https://launchpad.net/~racb/+archive ) didn't help me, the error is:

I: sink-input.c: Created input 3 "Simultaneous output on bluetooth" on alsa_output.bluetooth with sample spec s16le 2ch 44100Hz and channel map front-left,front-right
I: module-alsa-sink.c: Starting playback.
D: module-alsa-sink.c: Wakeup from ALSA! OUTPUT
D: module-alsa-sink.c: Wakeup from ALSA! OUTPUT
D: module-alsa-sink.c: Wakeup from ALSA! OUTPUT
D: module-alsa-sink.c: latency set to 139.32ms
D: module-alsa-sink.c: hwbuf_unused_frames=1
D: module-alsa-sink.c: setting avail_min=10462
D: module-alsa-sink.c: Requesting rewind due to latency change.
D: module-alsa-sink.c: Wakeup from ALSA! OUTPUT
D: module-alsa-sink.c: Requested to rewind 24576 bytes.
D: module-alsa-sink.c: Limited to 10464 bytes.
D: module-alsa-sink.c: before: 2616
D: module-alsa-sink.c: after: 2616
D: module-alsa-sink.c: Rewound 10464 bytes.
D: sink.c: Processing rewind...
D: sink-input.c: Have to rewind 10464 bytes on render memblockq.
E: module-combine.c: Assertion '!op->outq_rtpoll_item_read && !op->inq_rtpoll_item_write' failed at modules/module-combine.c:691, function sink_process_msg(). Aborting.
Aborted

i'm having this issue with Jaunty 64Bits and even Karmic (but i must retest with Karmic to be sure)

Pulseaudio also crashes for me when I plug in my USB soundcard.

Interestingly if audio is playing at the time you plug it in then there is no problem and the audio output on my usb soundcard quickly starts. Otherwise pulseaudio crashes but I haven't managed to get a debug output yet.

This bug was fixed in the package pulseaudio - 1:0.9.22~0.9.21+341-g62bf-0ubuntu1

---------------
pulseaudio (1:0.9.22~0.9.21+341-g62bf-0ubuntu1) lucid; urgency=low

  * New snapshot based on stable-queue git branch (testing requested
    specifically by upstream)
    - LP: #164745, #173212, #201391, #204536, #207796, #210016, #221038,
    - LP: #226342, #230408, #236423, #237443, #250059, #269585, #274304,
    - LP: #274577, #275474, #277532, #277566, #277932, #278025, #280534,
    - LP: #283049, #286816, #287036, #292732, #298011, #298301, #300290,
    - LP: #302038, #311497, #311853, #324062, #339448, #344057, #348979,
    - LP: #350829, #356206, #367379, #367544, #369822, #371897, #374846,
    - LP: #375570, #381801, #399515, #402950, #403786, #408169, #409322,
    - LP: #409723, #410326, #410446, #417695, #417976, #419271, #421072,
    - LP: #422774, #423979, #424655, #425028, #427016, #431072, #432660,
    - LP: #437640, #437996, #442191, #443306, #443389, #446719, #449762,
    - LP: #455417, #461532, #464652, #483191, #497537, #503780
  * debian/patches/:
    + add: 0099-change-configure-git-version-tag.patch: Match released
           upstream 0.9.21 for shlibs and LIBPULSE_VERSION_INFO
    - drop: 0004-set-tsched0.patch (no longer relevant)
            0050-revert-pacmd-poll-argv.patch (no longer relevant)
            0056-dont-bail-on-sound-class-modem.patch (merged)
            0056-ignore-sound-class-modem.patch (merged)
            0058-Backport-4c793.patch (merged)
            0059-Backport-978d3.patch (merged)
            0060-fix-implicit-func-decl-cpu-arm.patch (merged)
            0061-Backport-c5fdb.patch (merged)
            0070-dont-bail-on-sound-class-modem-devs.patch (merged)
    + refresh: 0001-change-resample-and-buffering.patch
               0090-disable-flat-volumes.patch
               0091-dont-load-cork-music-on-phone.patch
               0057-load-module-x11-bell.patch
 -- Daniel T Chen <email address hidden> Thu, 14 Jan 2010 20:33:05 -0500