[libvirt] [PATCH] events: Fix domain event race on client disconnect

[Christophe Fergeau]

Hey,

On Fri, Sep 07, 2012 at 02:55:51PM +0200, Michal Privoznik wrote:
> On 07.09.2012 14:47, Daniel P. Berrange wrote:
> > On Fri, Sep 07, 2012 at 02:44:03PM +0200, Christophe Fergeau wrote:
> >> On Fri, Sep 07, 2012 at 01:24:35PM +0100, Daniel P. Berrange wrote:
> >>> A nice long detailed explanation. I agree that this scenario you
> >>> outline is plausible as an explanation for why Boxes sometimes
> >>> stops getting events from libvirtd.
> >>
> >> I've ran more tests in the mean time without this patch applied, but
> >> with the one below to add some debugging:
> >>
> >> diff --git a/src/conf/domain_event.c b/src/conf/domain_event.c
> >> index 43ecdcf..33d90fb 100644
> >> --- a/src/conf/domain_event.c
> >> +++ b/src/conf/domain_event.c
> >> @@ -1501,7 +1501,13 @@ virDomainEventStateRegisterID(virConnectPtr conn,
> >>      int ret = -1;
> >>
> >>      virDomainEventStateLock(state);
> >> +    VIR_WARN("RegisterID");
> 
> [1]
> 
> >>
> >> +    if ((state->callbacks->count == 0) && (state->timer == -1)) {
> >> +        if (state->queue->count != 0) {
> >> +            VIR_WARN("REG: queue's not empty: %d", state->queue->count);
> 
> I understand the WARN level here but not in [1]. Isn't DEBUG just enough
> there?

Oh this was just a debug patch, I'm not proposing it for inclusion, hence
the WARN so that the logs I'm interested in jump to my face during the
debugging ;)

Christophe
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