I'm experiencing the same thing sporadically with two machines running a
handful of KVM VMs. It usually starts with one VM blocking, then spreads to
the rest, and eventually the host itself stops responding.

I cherry-picked the three patches in LP 276476 and applied them to the
2.6.28 kernel currently in sid. So far so good, but I don't have a solid
test case to reproduce and it usually takes a couple days for this to show
itself.

john
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John Morrissey _o / ---- __o
jwm@horde.net _-< \_ / ---- < ,
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