forked from pool/libvirt
6765bcc4b6
0dda594d-libvirtd-shutdown-deadlock.patch bnc#767797 OBS-URL: https://build.opensuse.org/package/show/Virtualization/libvirt?expand=0&rev=215
46 lines
1.7 KiB
Diff
46 lines
1.7 KiB
Diff
commit 0dda594da99aede7621018a3705e7cf4c13b1606
|
|
Author: Jim Fehlig <jfehlig@suse.com>
|
|
Date: Thu Jun 21 09:21:44 2012 -0600
|
|
|
|
Fix deadlock on libvirtd shutdown
|
|
|
|
When shutting down libvirtd, the virNetServer shutdown can deadlock
|
|
if there are in-flight jobs being handled by virNetServerHandleJob().
|
|
virNetServerFree() will acquire the virNetServer lock and call
|
|
virThreadPoolFree() to terminate the workers, waiting for the workers
|
|
to finish. But in-flight workers will attempt to acquire the
|
|
virNetServer lock, resulting in deadlock.
|
|
|
|
Fix the deadlock by unlocking the virNetServer lock before calling
|
|
virThreadPoolFree(). This is safe since the virNetServerPtr object
|
|
is ref-counted and only decrementing the ref count needs to be
|
|
protected. Additionally, there is no need to re-acquire the lock
|
|
after virThreadPoolFree() completes as all the workers have
|
|
terminated.
|
|
|
|
Index: libvirt-0.9.11.4/src/rpc/virnetserver.c
|
|
===================================================================
|
|
--- libvirt-0.9.11.4.orig/src/rpc/virnetserver.c
|
|
+++ libvirt-0.9.11.4/src/rpc/virnetserver.c
|
|
@@ -801,10 +801,9 @@ void virNetServerFree(virNetServerPtr sr
|
|
virNetServerLock(srv);
|
|
VIR_DEBUG("srv=%p refs=%d", srv, srv->refs);
|
|
srv->refs--;
|
|
- if (srv->refs > 0) {
|
|
- virNetServerUnlock(srv);
|
|
+ virNetServerUnlock(srv);
|
|
+ if (srv->refs > 0)
|
|
return;
|
|
- }
|
|
|
|
for (i = 0 ; i < srv->nservices ; i++)
|
|
virNetServerServiceToggle(srv->services[i], false);
|
|
@@ -845,7 +844,6 @@ void virNetServerFree(virNetServerPtr sr
|
|
dbus_connection_unref(srv->sysbus);
|
|
#endif
|
|
|
|
- virNetServerUnlock(srv);
|
|
virMutexDestroy(&srv->lock);
|
|
VIR_FREE(srv);
|
|
}
|