Hi all, I encountered a tricky problem. I am using ovs+DPDK on the host side to build the virtual network, so on the VM side , the virtio_net.ko module is used to drive the nic. But VM always freezes while insmod virtio_net.ko (I found virtio_net.ko is located in initrams.img by defualt, so I had to delete all virtio modules from initramfs.img and insmod then one by one after system is loaded to confirm that). After such freeze, virsh reset can not recover it due to cannot acquire state change lock (held by remoteDispatchDomainReset) so I have to use virsh destroy instead. On the ovs-vswitchd side, the last log I can see is: VHOST_CONFIG: read message VHOST_USER_SET_VRING_NUM VHOST_CONFIG: read message VHOST_USER_SET_VRING_BASE VHOST_CONFIG: read message VHOST_USER_SET_VRING_ADDR VHOST_CONFIG: read message VHOST_USER_SET_VRING_KICK VHOST_CONFIG: vring kick idx:0 file:59 VHOST_CONFIG: virtio is not ready for processing. VHOST_CONFIG: read message VHOST_USER_SET_VRING_CALL VHOST_CONFIG: vring call idx:0 file:60 VHOST_CONFIG: read message VHOST_USER_SET_VRING_NUM VHOST_CONFIG: read message VHOST_USER_SET_VRING_BASE VHOST_CONFIG: read message VHOST_USER_SET_VRING_ADDR VHOST_CONFIG: read message VHOST_USER_SET_VRING_KICK VHOST_CONFIG: vring kick idx:1 file:46 VHOST_CONFIG: virtio is not ready for processing. VHOST_CONFIG: read message VHOST_USER_SET_VRING_CALL VHOST_CONFIG: vring call idx:1 file:61 VHOST_CONFIG: read message VHOST_USER_SET_VRING_ENABLE VHOST_CONFIG: set queue enable: 1 to qp idx: 0 VHOST_CONFIG: read message VHOST_USER_SET_VRING_ENABLE VHOST_CONFIG: set queue enable: 1 to qp idx: 1 VHOST_CONFIG: read message VHOST_USER_SET_FEATURES Software version I used are: guest kernel: 3.10.0-514.26.2.el7.x86_64 host kernel: 3.10.0-514.26.2.el7.x86_64 host libvirt: 2.0.0-10.el7_3.9.x86_64 host qemu: 2.6.0-28.el7.10.1 host openvswitch: git 2.7.0 host DPDK: git 17.02.0 Please help to have a look at this issue. -- B.R., Jason