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f33e652
(Get the code!)
Would like to say I'm also having this problem. It happens rather regularly too. This time Pidgin is affected, it's uninterruptible and is hovering around the 70% CPU range, sometimes climbing to 100%. All the files it seems to have open are *.wav files, so that may point to it being PulseAudio?
Seems to happen to a random program (usually the one opened last) which is trying to play sound - Firefox 3 and Pidgin have been affected so far. Weirdly, however, I have killed PulseAudio, restarted RhythmBox and it's still playing! Even though it hasn't restarted PulseAudio, so maybe I'm not killing the right thing (or maybe RhythmBox doesn't use PulseAudio, which might therefore point to another culprit not releasing the sound device? Stabs in the dark..)
It presents itself by making my system sluggish, but not unusable, so I'll leave it on with the program in the background for a little while, see if it relents.
If you need more details or for me to test anything, please let me know. It happens rather regularly to me so I'm sure I can get a result of an experiment quite quickly ^_~