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qemu: avoid deadlock in qemuDomainObjStopWorker

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We are dropping the only reference here so that the event loop thread
is going to be exited synchronously. In order to avoid deadlocks we
need to unlock the VM so that any handler being called can finish
execution and thus even loop thread be finished too.

Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@virtuozzo.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Nikolay Shirokovskiy 2020-07-23 11:02:59 +03:00
parent f4fc3db920
commit 860a999802
1 changed files with 14 additions and 4 deletions
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18
src/qemu/qemu_domain.c
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@ -1722,11 +1722,21 @@ void
qemuDomainObjStopWorker(virDomainObjPtr dom)
{
qemuDomainObjPrivatePtr priv = dom->privateData;
virEventThread *eventThread;
if (priv->eventThread) {
g_object_unref(priv->eventThread);
priv->eventThread = NULL;
}
if (!priv->eventThread)
return;
/*
* We are dropping the only reference here so that the event loop thread
* is going to be exited synchronously. In order to avoid deadlocks we
* need to unlock the VM so that any handler being called can finish
* execution and thus even loop thread be finished too.
*/
eventThread = g_steal_pointer(&priv->eventThread);
virObjectUnlock(dom);
g_object_unref(eventThread);
virObjectLock(dom);
}