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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Hi, </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">We upgrade the OVS recently from one version 2.10 to another version 2.10. on some HV upgrade, the HV is down when running force reload kernel.
</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">In the ovs-ctl log, kill ovs-vswitch is failed, but the script is still going to reload the modules.
</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt">```</span><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">ovsdb-server is running with pid 2431</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">ovs-vswitchd is running with pid 2507</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">Thu Aug 22 23:13:49 UTC 2019:stop</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">2019-08-22T23:13:50Z|00001|fatal_signal|WARN|terminating with signal 14 (Alarm clock)</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">Alarm clock</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">2019-08-22T23:13:51Z|00001|fatal_signal|WARN|terminating with signal 14 (Alarm clock)</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">Alarm clock</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Exiting ovs-vswitchd (2507)</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Killing ovs-vswitchd (2507)</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Killing ovs-vswitchd (2507) with SIGKILL</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Killing ovs-vswitchd (2507) failed</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Exiting ovsdb-server (2431)</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">Thu Aug 22 23:14:58 UTC 2019:load-kmod</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">Thu Aug 22 23:14:58 UTC 2019:start --system-id=random --no-full-hostname</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">/usr/share/openvswitch/scripts/ovs-ctl: unknown option "--no-full-hostname" (use --help for help)</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Starting ovsdb-server</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Configuring Open vSwitch system IDs</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* ovs-vswitchd is already running</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Enabling remote OVSDB managers</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">ovsdb-server is running with pid 3860447</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">ovs-vswitchd is running with pid 2507</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">ovsdb-server is running with pid 3860447</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">ovs-vswitchd is running with pid 2507</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">Thu Aug 22 23:15:09 UTC 2019:load-kmod</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">Thu Aug 22 23:15:09 UTC 2019:force-reload-kmod --system-id=random --no-full-hostname</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">/usr/share/openvswitch/scripts/ovs-ctl: unknown option "--no-full-hostname" (use --help for help)</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Detected internal interfaces: br-int</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">Thu Aug 22 23:37:08 UTC 2019:stop</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">2019-08-22T23:37:09Z|00001|fatal_signal|WARN|terminating with signal 14 (Alarm clock)</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">Alarm clock</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">2019-08-22T23:37:10Z|00001|fatal_signal|WARN|terminating with signal 14 (Alarm clock)</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">Alarm clock</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Exiting ovs-vswitchd (2507)</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Killing ovs-vswitchd (2507)</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Killing ovs-vswitchd (2507) with SIGKILL</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Killing ovs-vswitchd (2507) failed</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Exiting ovsdb-server (3860447)</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">Thu Aug 22 23:40:42 UTC 2019:load-kmod</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Inserting openvswitch module</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">Thu Aug 22 23:40:42 UTC 2019:start --system-id=random --no-full-hostname</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">/usr/share/openvswitch/scripts/ovs-ctl: unknown option "--no-full-hostname" (use --help for help)</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Starting ovsdb-server</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Configuring Open vSwitch system IDs</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Starting ovs-vswitchd</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Enabling remote OVSDB managers</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">ovsdb-server is running with pid 2399</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">ovs-vswitchd is running with pid 2440</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">ovsdb-server is running with pid 2399</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">ovs-vswitchd is running with pid 2440</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">Thu Aug 22 23:46:18 UTC 2019:load-kmod</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">Thu Aug 22 23:46:18 UTC 2019:force-reload-kmod --system-id=random --no-full-hostname</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">/usr/share/openvswitch/scripts/ovs-ctl: unknown option "--no-full-hostname" (use --help for help)</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Detected internal interfaces: br-int br0</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Saving flows</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Exiting ovsdb-server (2399)</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Starting ovsdb-server</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Configuring Open vSwitch system IDs</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Flush old conntrack entries</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Exiting ovs-vswitchd (2440)</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Saving interface configuration</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Removing datapath: system@ovs-system</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Removing openvswitch module</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">rmmod: ERROR: Module vxlan is in use by: i40e</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Forcing removal of vxlan module</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Inserting openvswitch module</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Starting ovs-vswitchd</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Restoring saved flows</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Enabling remote OVSDB managers</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt">* Restoring interface configuration</span></i><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt">```</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">But in kern.log, we see the log as below, the process could not exit because waiting br0 release, and then, the ovs-ctl try to `kill term` and `kill -9` the process, it does not work, because kernel is in
infinity loop. Then, ovs-ctl try to save the flows, when save flow, core dump happened in kernel. Then HV is down until restart it.</span><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">```</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:13:45 slx11c-9gjm kernel: [21177057.998961] device br0 left promiscuous mode</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:13:55 slx11c-9gjm kernel: [21177068.044859] unregister_netdevice: waiting for br0 to become free. Usage count = 1</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:14:05 slx11c-9gjm kernel: [21177078.068429] unregister_netdevice: waiting for br0 to become free. Usage count = 1</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:14:15 slx11c-9gjm kernel: [21177088.312001] unregister_netdevice: waiting for br0 to become free. Usage count = 1</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:14:25 slx11c-9gjm kernel: [21177098.359556] unregister_netdevice: waiting for br0 to become free. Usage count = 1</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:14:35 slx11c-9gjm kernel: [21177108.603058] unregister_netdevice: waiting for br0 to become free. Usage count = 1</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:14:45 slx11c-9gjm kernel: [21177118.658643] unregister_netdevice: waiting for br0 to become free. Usage count = 1</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:14:55 slx11c-9gjm kernel: [21177128.678211] unregister_netdevice: waiting for br0 to become free. Usage count = 1</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:15:05 slx11c-9gjm kernel: [21177138.721732] unregister_netdevice: waiting for br0 to become free. Usage count = 1</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:15:15 slx11c-9gjm kernel: [21177148.817317] unregister_netdevice: waiting for br0 to become free. Usage count = 1</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:15:25 slx11c-9gjm kernel: [21177158.828853] unregister_netdevice: waiting for br0 to become free. Usage count = 1</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:15:35 slx11c-9gjm kernel: [21177168.860459] unregister_netdevice: waiting for br0 to become free. Usage count = 1</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:15:46 slx11c-9gjm kernel: [21177179.104006] unregister_netdevice: waiting for br0 to become free. Usage count = 1</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:15:56 slx11c-9gjm kernel: [21177189.143518] unregister_netdevice: waiting for br0 to become free. Usage count = 1</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:16:06 slx11c-9gjm kernel: [21177199.183075] unregister_netdevice: waiting for br0 to become free. Usage count = 1</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:16:16 slx11c-9gjm kernel: [21177209.262617] unregister_netdevice: waiting for br0 to become free. Usage count = 1</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:16:26 slx11c-9gjm kernel: [21177219.510207] unregister_netdevice: waiting for br0 to become free. Usage count = 1</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:16:36 slx11c-9gjm kernel: [21177229.521757] unregister_netdevice: waiting for br0 to become free. Usage count = 1</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:16:46 slx11c-9gjm kernel: [21177239.765278] unregister_netdevice: waiting for br0 to become free. Usage count = 1</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:16:57 slx11c-9gjm kernel: [21177250.008826] unregister_netdevice: waiting for br0 to become free. Usage count = 1</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.016400] unregister_netdevice: waiting for br0 to become free. Usage count = 1</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.256456] INFO: task revalidator221:3859855 blocked for more than 120 seconds.</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.264121] Tainted: G OE 4.4.0-104-generic #127-Ubuntu</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271176] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271179] revalidator221 D ffff8826844eba48 0 3859855 2506 0x00000084</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271180] ffff8826844eba48 0000000000000000 ffff884fc2e69540 ffff882758688000</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271181] ffff8826844ec000 ffffffffc0463564 ffff882758688000 00000000ffffffff</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271182] ffffffffc0463568 ffff8826844eba60 ffffffff81840765 ffffffffc0463560</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271182] Call Trace:</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271191] [<ffffffff81840765>] schedule+0x35/0x80</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271192] [<ffffffff81840a0e>] schedule_preempt_disabled+0xe/0x10</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271193] [<ffffffff81842649>] __mutex_lock_slowpath+0xb9/0x130</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271195] [<ffffffff818426df>] mutex_lock+0x1f/0x30</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271207] [<ffffffffc042ef56>] ovs_dp_cmd_get+0x46/0xf0 [openvswitch]</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271211] [<ffffffff8176d287>] genl_family_rcv_msg+0x1e7/0x3c0</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271213] [<ffffffff8176d460>] ? genl_family_rcv_msg+0x3c0/0x3c0</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271214] [<ffffffff8176d4d6>] genl_rcv_msg+0x76/0xb0</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271215] [<ffffffff8176a97c>] ? netlink_lookup+0xdc/0x140</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271217] [<ffffffff8176c9a4>] netlink_rcv_skb+0xa4/0xc0</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271218] [<ffffffff8176d088>] genl_rcv+0x28/0x40</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271219] [<ffffffff8176c37a>] netlink_unicast+0x18a/0x240</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271221] [<ffffffff8176c72b>] netlink_sendmsg+0x2fb/0x3a0</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271225] [<ffffffff813a1c11>] ? aa_sock_msg_perm+0x61/0x150</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271227] [<ffffffff8171bad8>] sock_sendmsg+0x38/0x50</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271228] [<ffffffff8171c581>] ___sys_sendmsg+0x281/0x290</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271231] [<ffffffff810badf7>] ? should_numa_migrate_memory+0x57/0x130</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271233] [<ffffffff811c2713>] ? handle_mm_fault+0xbc3/0x1820</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271235] [<ffffffff812101b4>] ? new_sync_read+0x94/0xd0</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271237] [<ffffffff8122e9e5>] ? __fget_light+0x25/0x60</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271238] [<ffffffff8171ced1>] __sys_sendmsg+0x51/0x90</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271239] [<ffffffff8171cf22>] SyS_sendmsg+0x12/0x20</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">Aug 22 16:17:07 slx11c-9gjm kernel: [21177260.271240] [<ffffffff81844872>] entry_SYSCALL_64_fastpath+0x16/0x71</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:6.5pt">```</span></i><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">My question is:</span><o:p></o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo3"><span style="font-size:11.0pt">Why we need to stop the openvswitch service before back up flows.</span><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo3"><span style="font-size:11.0pt">If the openvswitch is exiting status, why it still can receive request.</span><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo3"><span style="font-size:11.0pt">Why the br0 took so long time to exit.</span><o:p></o:p></li></ol>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I think this is a bug need to improve during upgrading.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thanks</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">L.J.</span><o:p></o:p></p>
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