[libvirt] the POLLHUP envet for a pipe descriptor is the cause that the libvirt_lxc costs 100% cpu usage.

[Daniel P. Berrange]

On Fri, Nov 01, 2013 at 09:04:09AM +0800, jj zhong wrote:
> I found the poll in virEventPollRunOnce (vireventpoll.c),  a POLLHUP event
> occurred for a pipe descriptor,  thus the poll always returned because of
> it.( the pipe broken). this may be the best I could track temporarily，I
> don't know what to do netx , to mask the hangup event or to do something to
> handle the hangup event , what to do ?   Is it a bug or something ?

Obviously there is a bug, since we should never go 100% CPU burn. We are
already handling POLLHUP though - it gets mapped to VIR_EVENT_HANDLE_HANGUP

Not sure why we continue to burn cycles though.

Daniel
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