I appear to be experiencing the bug described above. I believe I may
have found a workaround - I dont know if im missing something obvious.
Previously I was running jack using qjackctrl, which does not appear to
offer this option, but it seems that running jackd directly allows one
to use the "nozombies" option which prevents jack kicking off clients
which are too slow. this allows me to run at 11ms pretty happily (i have
not tried lower yet).

I haven't seen this mentioned yet - this either means I am stating
something useful and unnoticed, or something obvious and irrelevant!
hope it helps if the former, apologies if its the latter.

Running jackd as:
pasuspender -- jackd --nozombies --timeout 500 --realtime -P 89 -d alsa -p 256 
--rate 44100 --softmode

details:
ubuntu studio 9.04,  2.6.28-3-rt, mixxx 1.7, portaudio library: 
libportaudio2_19+svn20071207-0ubuntu3_i386.deb

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