Hi Yang/Senthil, I have several questions for the below bug: https://bugs.launchpad.net/starlingx/+bug/1839181 1. Before lock/unlock compute-0, is there any VM running on compute-0? Is there any network configured on compute-0? 2. Could you please help check the file (filename starts with "tap" or "qr") status in the below directory: /sys/devices/virtual/net/ /sys/class/net/ The following log in ovs-vswitchd in compute-1 shows those file are in wrong status which may cause ovs-vswitchd wrong: 2019-08-05T08:40:03.921Z|00881|dpif_netdev|ERR|error receiving data from tap588a7711-e2: File descriptor in bad state 2019-08-05T08:40:04.006Z|00882|dpif_netdev|ERR|error receiving data from tap588a7711-e2: File descriptor in bad state 2019-08-05T08:40:04.020Z|00888|dpif_netdev|ERR|error receiving data from tap588a7711-e2: File descriptor in bad state 2019-08-05T08:40:04.167Z|00889|dpif_netdev|ERR|error receiving data from tap6c26786b-f7: File descriptor in bad state 2019-08-05T08:40:04.167Z|00890|dpif_netdev|ERR|error receiving data from tap588a7711-e2: File descriptor in bad state Best Regards, Xu, Chenjie