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Re: [libvirt] [PATCHv3] qemu: fix crash when mixing sync and async monitor jobs



At 07/30/2011 05:37 AM, Eric Blake write:
On 07/29/2011 03:32 PM, Eric Blake wrote:
Currently, we attempt to run sync job and async job at the same time. It
means that the monitor commands for two jobs can be run in any order.



v3: incorporate Wen's feedback - in particular, virProcessStartCPUs
now checks for return type, restarting libvirt does not use an
async job, and I didn't hit the deadlock in the same scenarios as
I tested under v2.
I still need to do migration testing before I'm convinced that this
is right, but it's doing a lot better.

Nope, just got a deadlock, by sending SIGINT (^C) during the middle of
virsh managedsave. I'll have to keep looking for that culprit...

I think it's not a deadlock. Some threads of libvirtd quited, but the thread
to do managedsave does not quit, and it is blocked in qemuMonitorSend(),
and there is no thread to do monitor IO.




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