On 04/14/2011 09:11 PM, Wen Congyang wrote:
This patch do the following two things:
s/do/does/
1. hold an extra reference while handling watchdog event If the domain is not persistent, and qemu quits unexpectedly before calling processWatchdogEvent(), vm will be freed and the function processWatchdogEvent() will be dangerous.
2. unlock qemu driver and vm before returning from processWatchdogEvent() When the function processWatchdogEvent() failed, we only free wdEvent, but forget to unlock qemu driver and vm, free dumpfile.
--- src/qemu/qemu_driver.c | 34 ++++++++++++++++++++++------------ src/qemu/qemu_process.c | 4 ++++ 2 files changed, 26 insertions(+), 12 deletions(-)
Looks like your v2 caught my review comments correctly. But I found one more issue:
+++ b/src/qemu/qemu_process.c @@ -428,6 +428,10 @@ qemuProcessHandleWatchdog(qemuMonitorPtr mon ATTRIBUTE_UNUSED, if (VIR_ALLOC(wdEvent) == 0) { wdEvent->action = VIR_DOMAIN_WATCHDOG_ACTION_DUMP; wdEvent->vm = vm; + /* Hold an extra reference because we can't allow 'vm' to be + * deleted before handling watchdog event is finished. + */ + virDomainObjRef(vm); ignore_value(virThreadPoolSendJob(driver->workerPool, wdEvent));
Now that we have increased the ref count, we should decrease it if we are unable to send a job to the thread pool. That is, replace the ignore_value() with: if (virThreadPoolSendJob(...) < 0) { virDomainObjUnref(vm); VIR_FREE(wdEvent); } ACK with that change squashed in. -- Eric Blake eblake@redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org