On Tue 12 Sep 2017 03:37:09 PM CEST, WangJie (Captain) wrote: > the patch which fixed the bug is： > https://github.com/qemu/qemu/commit/1606e4cf8a976513ecac70ad6642a7ec45744cf5#diff-7cb66df56045598b75a219eebc27efb6
Oh, now I remember. Here's the bug report: https://bugzilla.redhat.com/show_bug.cgi?id=1428810 > But the condition which I made to causes crash is differ in the > condition you described in patch info, is it the same reason? How is it different? Doesn't the script that you posted do exactly that? (hot-unplug) >> *3、run below script for a while，the qemu process of VM will crash* >> ret=1 >> while [ $ret -ne 0 ]; do >> virsh attach-device i-clone203_rhel_7.3_64_guestosdev add-1.xml >> sleep 2 >> virsh detach-device i-clone203_rhel_7.3_64_guestosdev add-1.xml >> done It makes total sense that that patch fixes the problem. Without it, a deleted BlockBackend remains in a throttling group, which explains your backtrace. Berto
