Wen previously posted a report of a crash with migration. I could not reproduce it at the time, but since then someone else did and pointed out that it only occurs when TLS is in use https://www.redhat.com/archives/libvir-list/2011-July/msg00547.html This series of patches make the event handler reference counting more robust to avoid this problem -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list