Re: [libvirt] [PATCH] unlock the monitor when unwatching the monitor

Steps to reproduce this bug: # virsh qemu-monitor-command domain 'cpu_set 2 online' --hmp The domain has 2 cpus, and we try to set the third cpu online. The qemu crashes, and this command will hang. The reason is that the refs is not 1 when we unwatch the monitor. We lock the monitor, but we do not unlock it. So virCondWait() will be blocked. Signed-off-by: Wen Congyang <wency(a)cn.fujitsu.com&gt; --- src/qemu/qemu_monitor.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c index da38096..dc08594 100644 --- a/src/qemu/qemu_monitor.c +++ b/src/qemu/qemu_monitor.c @@ -239,7 +239,8 @@ qemuMonitorUnwatch(void *monitor) qemuMonitorPtr mon = monitor; qemuMonitorLock(mon); - qemuMonitorUnref(mon); + if (qemuMonitorUnref(mon) > 0) + qemuMonitorUnlock(mon); }