[ovs-discuss] ovs-vswitchd 100% CPU usage after hard reboot

Jamon Camisso jamon.camisso at canonical.com
Fri May 3 03:12:48 UTC 2019


I'm seeing an identical issue to the one posted here a few months ago:

https://mail.openvswitch.org/pipermail/ovs-discuss/2018-October/047558.html
- I'll include the bug report template at the end.

The issue is an ovs-vswitchd thread consuming 100% CPU in a very lightly
used Openstack Rocky cloud running on Bionic. Logs are filled with
entries like this, about ~14000 per day:

2019-05-01T18:34:30.110Z|237220|poll_loop(handler89)|INFO|Dropped
1092844 log messages in last 6 seconds (most recently, 0 seconds ago)
due to excessive rate

2019-05-01T18:34:30.110Z|237221|poll_loop(handler89)|INFO|wakeup due to
[POLLIN] on fd 42 (unknown anon_inode:[eventpoll]) at
../lib/dpif-netlink.c:2786 (99% CPU usage)

ovs-vswitchd is running alongside various neutron processes
(lbaasv2-agent, metadata-agent, l3-agent, dhcp-agent, openvswitch-agent)
inside an LXC container on a physical host. There is a single neutron
router, and the entire environment including br-tun, br-ex, and br-int
traffic barely goes over 200KiB/s TX/RX combined.

If it is an issue with the Ubuntu packaged version (the other report is
the same 2.10.0 package on Bionic which is suspicious), I've also filed
a bug to track things here:
https://bugs.launchpad.net/ubuntu/+source/openvswitch/+bug/1827264

Thanks for any feedback or troubleshooting steps anyone can provide.

Cheers, Jamon





Bug template:

What you did that make the problem appear.
  - host server was hard rebooted. lxc containers came back up fine, but
    ovs-vswitchd thread is spinning CPU and has remained that way for 10
    days

What you expected to happen.
  - negligible CPU usage since the cloud isn't in production

What actually happened.
  - a single ovs-vswitchd thread is spinning at 100% CPU and logs are
    populated with thousands of messages claiming a million+ messages
    are dropped every 6 seconds

The Open vSwitch version number (as output by ovs-vswitchd --version).
  - ovs-vswitchd (Open vSwitch) 2.10.0 (the Ubuntu packaged version)

The Git commit number (as output by git rev-parse HEAD)
  - N/A

Any local patches or changes you have applied (if any).
  - N/A

The kernel version on which Open vSwitch is running (from /proc/version)
  - Linux version 4.15.0-47-generic (buildd at lgw01-amd64-001) (gcc
    version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #50-Ubuntu SMP Wed Mar 13
    10:44:52 UTC 2019

The distribution and version number of your OS (e.g. “Centos 5.0”).
  - Ubuntu 18.04.2 LTS

The contents of the vswitchd configuration database (usually
/etc/openvswitch/conf.db).
  - See attached conf.db.txt

The output of ovs-dpctl show.
  - See below:

root at juju-df624b-4-lxd-10:~# ovs-dpctl show
system at ovs-system:
  lookups: hit:223561120 missed:5768546 lost:798
  flows: 131
  masks: hit:2284286371 total:15 hit/pkt:9.96
  port 0: ovs-system (internal)
  port 1: br-ex (internal)
  port 2: eth1
  port 3: gre_sys (gre: packet_type=ptap)
  port 4: br-tun (internal)
  port 5: br-int (internal)
  port 6: tapa062d6f1-40
  port 7: tapf90e3ab6-13
  port 8: tap45ba891c-4c

root at juju-df624b-4-lxd-10:~# ovs-ofctl show br-int
OFPT_FEATURES_REPLY (xid=0x2): dpid:00003643edb09542
n_tables:254, n_buffers:0
capabilities: FLOW_STATS TABLE_STATS PORT_STATS QUEUE_STATS ARP_MATCH_IP
actions: output enqueue set_vlan_vid set_vlan_pcp strip_vlan mod_dl_src
mod_dl_dst mod_nw_src mod_nw_dst mod_nw_tos mod_tp_src mod_tp_dst
 1(int-br-ex): addr:4a:b4:cc:dd:aa:ac
     config: 0
     state: 0
     speed: 0 Mbps now, 0 Mbps max
 2(patch-tun): addr:7a:36:76:1f:47:6e
     config: 0
     state: 0
     speed: 0 Mbps now, 0 Mbps max
 3(tapa062d6f1-40): addr:92:d4:6c:26:55:0a
     config: 0
     state: 0
     current: 10GB-FD COPPER
     speed: 10000 Mbps now, 0 Mbps max
 4(tapf90e3ab6-13): addr:9e:8b:4f:ae:8f:ba
     config: 0
     state: 0
     current: 10GB-FD COPPER
     speed: 10000 Mbps now, 0 Mbps max
 5(tap45ba891c-4c): addr:76:45:39:c8:d7:e0
     config: 0
     state: 0
     current: 10GB-FD COPPER
     speed: 10000 Mbps now, 0 Mbps max
 LOCAL(br-int): addr:36:43:ed:b0:95:42
     config: PORT_DOWN
     state: LINK_DOWN
     speed: 0 Mbps now, 0 Mbps max
OFPT_GET_CONFIG_REPLY (xid=0x4): frags=normal miss_send_len=0

root at juju-df624b-4-lxd-10:~# ovs-ofctl show br-tun
OFPT_FEATURES_REPLY (xid=0x2): dpid:000092c6c8f4a545
n_tables:254, n_buffers:0
capabilities: FLOW_STATS TABLE_STATS PORT_STATS QUEUE_STATS ARP_MATCH_IP
actions: output enqueue set_vlan_vid set_vlan_pcp strip_vlan mod_dl_src
mod_dl_dst mod_nw_src mod_nw_dst mod_nw_tos mod_tp_src mod_tp_dst
 1(patch-int): addr:02:1d:bc:ec:0c:3b
     config: 0
     state: 0
     speed: 0 Mbps now, 0 Mbps max
 2(gre-0a30029b): addr:fe:09:61:11:92:8b
     config: 0
     state: 0
     speed: 0 Mbps now, 0 Mbps max
 3(gre-0a3002a2): addr:a2:64:93:48:e2:82
     config: 0
     state: 0
     speed: 0 Mbps now, 0 Mbps max
 4(gre-0a30029d): addr:12:b1:73:32:19:d4
     config: 0
     state: 0
     speed: 0 Mbps now, 0 Mbps max
 5(gre-0a3002ce): addr:ca:10:51:f2:0f:05
     config: 0
     state: 0
     speed: 0 Mbps now, 0 Mbps max
 6(gre-0a3002a1): addr:de:fe:95:33:d9:67
     config: 0
     state: 0
     speed: 0 Mbps now, 0 Mbps max
 7(gre-0a30029e): addr:5a:fa:ce:15:7b:5c
     config: 0
     state: 0
     speed: 0 Mbps now, 0 Mbps max
 8(gre-0a3002c3): addr:b6:87:66:09:fc:04
     config: 0
     state: 0
     speed: 0 Mbps now, 0 Mbps max
 10(gre-0a3002a0): addr:ce:79:f2:bf:a8:94
     config: 0
     state: 0
     speed: 0 Mbps now, 0 Mbps max
 14(gre-0a30029f): addr:b6:b0:84:7d:9f:aa
     config: 0
     state: 0
     speed: 0 Mbps now, 0 Mbps max
 18(gre-0a30029c): addr:da:14:12:54:1c:ec
     config: 0
     state: 0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-tun): addr:92:c6:c8:f4:a5:45
     config: PORT_DOWN
     state: LINK_DOWN
     speed: 0 Mbps now, 0 Mbps max
OFPT_GET_CONFIG_REPLY (xid=0x4): frags=normal miss_send_len=0

root at juju-df624b-4-lxd-10:~# ovs-ofctl show br-ex
OFPT_FEATURES_REPLY (xid=0x2): dpid:000000163e9a47a2
n_tables:254, n_buffers:0
capabilities: FLOW_STATS TABLE_STATS PORT_STATS QUEUE_STATS ARP_MATCH_IP
actions: output enqueue set_vlan_vid set_vlan_pcp strip_vlan mod_dl_src
mod_dl_dst mod_nw_src mod_nw_dst mod_nw_tos mod_tp_src mod_tp_dst
 1(eth1): addr:00:16:3e:9a:47:a2
     config: 0
     state: 0
     current: 10GB-FD COPPER
     speed: 10000 Mbps now, 0 Mbps max
 2(phy-br-ex): addr:ce:a8:6a:25:55:0e
     config: 0
     state: 0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-ex): addr:00:16:3e:9a:47:a2
     config: 0
     state: 0
     speed: 0 Mbps now, 0 Mbps max
OFPT_GET_CONFIG_REPLY (xid=0x4): frags=normal miss_send_len=0
-------------- next part --------------
OVSDB JSON 13210 f15cb2cc48f300ff798551cf23327fc3f9166611
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OVSDB JSON 10397 06da376b46a78bab90b34d46d513d7dd837a8002
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