I have this problem constantly. I agree this seems to be triggered most
often by pulseaudio. I'm using an epa kernel mod for Oneiric which sets
a nice value of -12 for pulse (I've used it since. The most common way
to trigger the crash is when an internet ad on a website like yahoo
tries to push audio through firefox while I'm listening to music with
any music player. Firefox works fine but pa sometimes stutters in
threadbuffering and the desktop crashes behind firefox (memlock?) and
icons and sometimes even characters become corrupted. It seems there is
a ruthless thread in buffer overrun. Also happens frequently when a
second user logs in to the same Ubuntu box. Perhaps there's a bug in
thread cloning between pa and gvfs? Bad header info in the
XXXThread.clone of one or both? I'm not a thread expert but these are
issues worthy of someone more familiar with the specific projects I
suppose.

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https://bugs.launchpad.net/bugs/320581

Title:
  gvfs-fuse-daemon halted with futex_wait signal

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