> When I run tcpdump on a *guest*, the entire guest completely freezes > up; no response even to hitting enter on the console. "virsh list" > also locks up whenever it tries to print state about that VM (but > the others work fine), as does any other operation that touches the > state of that VM. The VM takes up 100% of CPU on one core while > this is happening. Eventually it gets better. > exactly the same I was describing here some time ago, with the difference I get a lot of ugly backtraces and sometimes the guest doesn't get to usable state at all (filesystems switches to read only due to errors or the whole guest locks up) n.
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