(That last comment was for the hang when changing latency.)
With more testing, the random hang seems to be fixed in r1411 of PA as well. 
With latency at 5ms, I let Mixxx run for 5 hours (looping both decks) and the 
audio thread didn't hang. Testing with the version of PA that ships with Ubuntu 
and leaving Mixxx to run overnight (with latency at 36ms) resulted in the audio 
thread hanging such that when you close Mixxx, it hangs on "closing 
Soundmanager." Testing with PA r1413 with the same settings resulted in audio 
thread hangs within a minute after starting Mixxx (though with gdb running it 
took considerably longer, about 3 hours.)

** Attachment added: "Back trace with audio thread hung"
   http://launchpadlibrarian.net/29147690/backtrace.txt

-- 
Sound engine-related hang on Ubuntu (Studio) 9.04 with ALSA back end
https://bugs.launchpad.net/bugs/383431
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