> Can see only shutting down, reason=crashed in libvirt/qemu logs .Nothing else . > Couldn't find anything else in neutron logs as well Just to be sure, this isn't due to a NUMA scheduling issue by chance? I had this topic up a little bit ago, where it is possible to have Nova over-schedule a NUMA node when the flavor's parameters are not set correctly: http://lists.openstack.org/pipermail/openstack-discuss/2020-October/018045.html Eric