The problem first reported (as far as I can tell) at http://openvswitch.org/pipermail/discuss/2014-May/013856.html still occurs.
I'm uncertain whether the problem is in creating the checksums or validating them. Scenario: 9 hosts in a cluster (running Proxmox VE on top of Debian 7.8 using PVE's backported RHEL7 kernel) that use multicast to talk to each other and stay in sync. Management IP address bound to an OVSIntPort (VLAN tagged) through an OVS bridge, then over a two-way LACP-bonded pair to the switch and the rest of the cluster. IGMP is disabled completely in this environment. Various other tap interfaces exist for KVM, some tagged, some untagged. Symptom: A non-deterministic set of cluster members will at some point (fairly soon after boot, usually within 15 minutes) begin complaining about UDP checksum errors on received packets from peer nodes. This causes the cluster to lose quorum in interesting ways (including overlapping but divergent views of cluster membership causing quasi-split-brain situations). The UDP checksum error is *only* reported on nodes where VMs are currently running, and have created tap interfaces, and (something) was put into promiscuous mode (according to dmesg). Workaround: reboot one or more nodes in the cluster; the first ~10 minutes of operation are usually error-free. Other notes: Dietmar noted in his original report last year that sending untagged multicast frames from the OVS Bridge interface itself does not trigger this behaviour - I haven't tested this yet. I'm not sure precisely which component is generating the UDP Checksum error; I assume the kernel's IP stack (since it shows up in dmesg without any annotation) but am not familiar enough with the code to be certain. Guesses: since it *only* occurs when there are tap interfaces active, I would assume that something to do with that code is accidentally mangling the incoming packet before the it gets delivered to the logical internal interface for handoff to the Linux network stack. Since only *some* of the nodes (given 100% identical hardware, versions, drivers, etc.) report the error and *only* when tap interfaces are active, I assume the checksum is correct on the wire and that the packet gets mangled on input at the receiving node, not on output from the sending node. Other data, as requested by https://github.com/openvswitch/ovs/blob/master/REPORTING-BUGS.md: root@pve1:~# ovs-vswitchd --version ovs-vswitchd (Open vSwitch) 2.3.1 Compiled Dec 27 2014 11:00:44 OpenFlow versions 0x1:0x1 root@pve1:/var/log# ovs-vsctl show 0e3b4265-911c-4e8f-9fae-5a19ab628828 Bridge "vmbr0" Port "tap102i0" tag: 158 Interface "tap102i0" Port "tap104i0" Interface "tap104i0" Port "vmbr0" Interface "vmbr0" type: internal Port "tap117i0" Interface "tap117i0" Port "mgmt158" tag: 158 Interface "mgmt158" type: internal Port "tap101i0" tag: 158 Interface "tap101i0" Port "ceph157" tag: 157 Interface "ceph157" type: internal Port "tap100i0" Interface "tap100i0" Port "bond0" Interface "eth0" Interface "eth1" ovs_version: "2.3.1" root@pve1:~# ovs-vswitchd --version ovs-vswitchd (Open vSwitch) 2.3.1 Compiled Dec 27 2014 11:00:44 OpenFlow versions 0x1:0x1 root@pve1:~# cat /proc/version Linux version 3.10.0-10-pve (root@lola) (gcc version 4.7.2 (Debian 4.7.2-5) ) #1 SMP Fri May 8 10:33:04 CEST 2015 root@pve1:~# cat /etc/debian_version 7.8 root@pve1:~# cat /proc/version Linux version 3.10.0-10-pve (root@lola) (gcc version 4.7.2 (Debian 4.7.2-5) ) #1 SMP Fri May 8 10:33:04 CEST 2015 root@pve1:~# cat /etc/openvswitch/conf.db OVSDB JSON 11702 23281c151b8d8785fc2f3f3a6620829bd3d9bcf3 {"tables":{"Port":{"columns":{"name":{"mutable":false,"type":"string"},"qos":{"type":{"key":{"type":"uuid","refTable":"QoS"},"min":0}},"vlan_mode":{"type":{"key":{"type":"string","enum":["set",["access","native-tagged","native-untagged","trunk"]]},"min":0}},"statistics":{"ephemeral":true,"type":{"key":"string","min":0,"value":"integer","max":"unlimited"}},"status":{"ephemeral":true,"type":{"key":"string","min":0,"value":"string","max":"unlimited"}},"mac":{"type":{"key":"string","min":0}},"trunks":{"type":{"key":{"maxInteger":4095,"minInteger":0,"type":"integer"},"min":0,"max":4096}},"interfaces":{"type":{"key":{"type":"uuid","refTable":"Interface"},"max":"unlimited"}},"bond_active_slave":{"type":{"key":"string","min":0}},"bond_downdelay":{"type":"integer"},"bond_mode":{"type":{"key":{"type":"string","enum":["set",["active-backup","balance-slb","balance-tcp"]]},"min":0}},"bond_updelay":{"type":"integer"},"external_ids":{"type":{"key":"string","min":0,"value":"string","max":"unlimited"}},"other_config":{"type":{"key":"string","min":0,"value":"string","max":"unlimited"}},"bond_fake_iface":{"type":"boolean"},"tag":{"type":{"key":{"maxInteger":4095,"minInteger":0,"type":"integer"},"min":0}},"fake_bridge":{"type":"boolean"},"lacp":{"type":{"key":{"type":"string","enum":["set",["active","off","passive"]]},"min":0}}},"indexes":[["name"]]},"Manager":{"columns":{"is_connected":{"ephemeral":true,"type":"boolean"},"target":{"type":"string"},"other_config":{"type":{"key":"string","min":0,"value":"string","max":"unlimited"}},"external_ids":{"type":{"key":"string","min":0,"value":"string","max":"unlimited"}},"max_backoff":{"type":{"key":{"minInteger":1000,"type":"integer"},"min":0}},"status":{"ephemeral":true,"type":{"key":"string","min":0,"value":"string","max":"unlimited"}},"connection_mode":{"type":{"key":{"type":"string","enum":["set",["in-band","out-of-band"]]},"min":0}},"inactivity_probe":{"type":{"key":"integer","min":0}}},"indexes":[["target"]]},"Bridge":{"columns":{"name":{"mutable":false,"type":"string"},"netflow":{"type":{"key":{"type":"uuid","refTable":"NetFlow"},"min":0}},"flood_vlans":{"type":{"key":{"maxInteger":4095,"minInteger":0,"type":"integer"},"min":0,"max":4096}},"mirrors":{"type":{"key":{"type":"uuid","refTable":"Mirror"},"min":0,"max":"unlimited"}},"datapath_id":{"ephemeral":true,"type":{"key":"string","min":0}},"status":{"ephemeral":true,"type":{"key":"string","min":0,"value":"string","max":"unlimited"}},"controller":{"type":{"key":{"type":"uuid","refTable":"Controller"},"min":0,"max":"unlimited"}},"ipfix":{"type":{"key":{"type":"uuid","refTable":"IPFIX"},"min":0}},"protocols":{"type":{"key":{"type":"string","enum":["set",["OpenFlow10","OpenFlow11","OpenFlow12","OpenFlow13","OpenFlow14","OpenFlow15"]]},"min":0,"max":"unlimited"}},"fail_mode":{"type":{"key":{"type":"string","enum":["set",["secure","standalone"]]},"min":0}},"ports":{"type":{"key":{"type":"uuid","refTable":"Port"},"min":0,"max":"unlimited"}},"external_ids":{"type":{"key":"string","min":0,"value":"string","max":"unlimited"}},"other_config":{"type":{"key":"string","min":0,"value":"string","max":"unlimited"}},"flow_tables":{"type":{"key":{"maxInteger":254,"minInteger":0,"type":"integer"},"min":0,"value":{"type":"uuid","refTable":"Flow_Table"},"max":"unlimited"}},"sflow":{"type":{"key":{"type":"uuid","refTable":"sFlow"},"min":0}},"datapath_type":{"type":"string"},"stp_enable":{"type":"boolean"}},"indexes":[["name"]]},"Interface":{"columns":{"name":{"mutable":false,"type":"string"},"options":{"type":{"key":"string","min":0,"value":"string","max":"unlimited"}},"statistics":{"ephemeral":true,"type":{"key":"string","min":0,"value":"integer","max":"unlimited"}},"link_speed":{"ephemeral":true,"type":{"key":"integer","min":0}},"mtu":{"ephemeral":true,"type":{"key":"integer","min":0}},"mac_in_use":{"ephemeral":true,"type":{"key":"string","min":0}},"type":{"type":"string"},"cfm_remote_opstate":{"ephemeral":true,"type":{"key":{"type":"string","enum":["set",["down","up"]]},"min":0}},"ingress_policing_rate":{"type":{"key":{"minInteger":0,"type":"integer"}}},"status":{"ephemeral":true,"type":{"key":"string","min":0,"value":"string","max":"unlimited"}},"mac":{"type":{"key":"string","min":0}},"ofport":{"type":{"key":"integer","min":0}},"ifindex":{"ephemeral":true,"type":{"key":{"maxInteger":4294967295,"minInteger":0,"type":"integer"},"min":0}},"cfm_fault_status":{"ephemeral":true,"type":{"key":"string","min":0,"max":"unlimited"}},"duplex":{"ephemeral":true,"type":{"key":{"type":"string","enum":["set",["full","half"]]},"min":0}},"lacp_current":{"ephemeral":true,"type":{"key":"boolean","min":0}},"cfm_fault":{"ephemeral":true,"type":{"key":"boolean","min":0}},"other_config":{"type":{"key":"string","min":0,"value":"string","max":"unlimited"}},"admin_state":{"ephemeral":true,"type":{"key":{"type":"string","enum":["set",["down","up"]]},"min":0}},"link_state":{"ephemeral":true,"type":{"key":{"type":"string","enum":["set",["down","up"]]},"min":0}},"external_id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20717","name":"Open_vSwitch","version":"7.6.2"} OVSDB JSON 194 e3568d4c5a38ddbc71f84232f63a364bedcc8650 {"_date":1436987680725,"Open_vSwitch":{"796212bb-db53-4578-9d72-d06d723e5583":{"db_version":"7.6.2"}},"_comment":"ovs-vsctl: ovs-vsctl --no-wait -- init -- set Open_vSwitch . db-version=7.6.2"} OVSDB JSON 453 ac40dd1f3b81a9dbdbc0667e66b3b64cbddededf {"_date":1436987680792,"Open_vSwitch":{"796212bb-db53-4578-9d72-d06d723e5583":{"system_version":"unknown","ovs_version":"2.3.1","system_type":"unknown","external_ids":["map",[["system-id","93e4c489-b78c-4a4a-a7ec-ca98916a3e83"]]]}},"_comment":"ovs-vsctl: ovs-vsctl --no-wait set Open_vSwitch . ovs-version=2.3.1 \"external-ids:system-id=\\\"93e4c489-b78c-4a4a-a7ec-ca98916a3e83\\\"\" \"system-type=\\\"unknown\\\"\" \"system-version=\\\"unknown\\\"\""} OVSDB JSON 567 d156b984f16309e9618a16905da65f3580295198 {"_date":1436987681022,"Port":{"c0c8331e-354b-436f-be1f-04c785bdb10a":{"name":"vmbr0","interfaces":["uuid","de9d193d-efc0-42de-8f04-81b3d05fd45e"]}},"Interface":{"de9d193d-efc0-42de-8f04-81b3d05fd45e":{"name":"vmbr0","type":"internal"}},"Bridge":{"6602557a-7e30-4dc7-a5f4-0eca29bfb2f3":{"name":"vmbr0","ports":["uuid","c0c8331e-354b-436f-be1f-04c785bdb10a"]}},"_comment":"ovs-vsctl: ovs-vsctl --timeout=5 -- --may-exist add-br vmbr0 --","Open_vSwitch":{"796212bb-db53-4578-9d72-d06d723e5583":{"bridges":["uuid","6602557a-7e30-4dc7-a5f4-0eca29bfb2f3"],"next_cfg":1}}} OVSDB JSON 164 d5f5306c90919a761cb0b31eb6d3d50fbd4c166c {"_date":1436987681149,"Interface":{"de9d193d-efc0-42de-8f04-81b3d05fd45e":{"ofport":65534}},"Open_vSwitch":{"796212bb-db53-4578-9d72-d06d723e5583":{"cur_cfg":1}}} OVSDB JSON 764 39f789756c054e4b0a027a67fce078b2746de1c2 {"_date":1436987681200,"Port":{"4346c2cb-2f68-4a72-9c54-b1c561438eec":{"name":"bond0","bond_mode":"balance-tcp","lacp":"active","interfaces":["set",[["uuid","35537fd4-f5f7-4fba-acf9-0c88748b8990"],["uuid","8f6b0722-7235-4925-994e-0b82b9f8109d"]]],"bond_fake_iface":true}},"Bridge":{"6602557a-7e30-4dc7-a5f4-0eca29bfb2f3":{"ports":["set",[["uuid","4346c2cb-2f68-4a72-9c54-b1c561438eec"],["uuid","c0c8331e-354b-436f-be1f-04c785bdb10a"]]]}},"Interface":{"35537fd4-f5f7-4fba-acf9-0c88748b8990":{"name":"eth0"},"8f6b0722-7235-4925-994e-0b82b9f8109d":{"name":"eth1"}},"_comment":"ovs-vsctl: ovs-vsctl --timeout=5 -- --fake-iface add-bond vmbr0 bond0 eth0 eth1 lacp=active bond_mode=balance-tcp --","Open_vSwitch":{"796212bb-db53-4578-9d72-d06d723e5583":{"next_cfg":2}}} OVSDB JSON 212 df73e852a500b8f5f374e047d1685267a8281d12 {"_date":1436987681328,"Interface":{"35537fd4-f5f7-4fba-acf9-0c88748b8990":{"ofport":1},"8f6b0722-7235-4925-994e-0b82b9f8109d":{"ofport":2}},"Open_vSwitch":{"796212bb-db53-4578-9d72-d06d723e5583":{"cur_cfg":2}}} OVSDB JSON 671 9c43be618258aaeae473e23ba71a71b865e5e958 {"_date":1436987681856,"Port":{"b1ea8a16-a3ed-4c65-bbaf-d961db7eca32":{"name":"ceph157","interfaces":["uuid","44b1a528-02a4-4371-9290-c6c356b538d5"],"tag":157}},"Bridge":{"6602557a-7e30-4dc7-a5f4-0eca29bfb2f3":{"ports":["set",[["uuid","4346c2cb-2f68-4a72-9c54-b1c561438eec"],["uuid","b1ea8a16-a3ed-4c65-bbaf-d961db7eca32"],["uuid","c0c8331e-354b-436f-be1f-04c785bdb10a"]]]}},"Interface":{"44b1a528-02a4-4371-9290-c6c356b538d5":{"name":"ceph157","type":"internal"}},"_comment":"ovs-vsctl: ovs-vsctl --timeout=5 -- --may-exist add-port vmbr0 ceph157 tag=157 -- set Interface ceph157 type=internal --","Open_vSwitch":{"796212bb-db53-4578-9d72-d06d723e5583":{"next_cfg":3}}} OVSDB JSON 160 947ab8f46acb663a4aeeaff0d09e99e2127791ef {"_date":1436987681859,"Interface":{"44b1a528-02a4-4371-9290-c6c356b538d5":{"ofport":4}},"Open_vSwitch":{"796212bb-db53-4578-9d72-d06d723e5583":{"cur_cfg":3}}} OVSDB JSON 719 19d9cfc5b32420c363708790222751665bebb32a {"_date":1436987682027,"Port":{"c15ac310-c6f9-427d-a3d3-035296c325a5":{"name":"mgmt158","interfaces":["uuid","a267cf7b-c9cb-44ab-b4cd-1a2903b8f2ca"],"tag":158}},"Interface":{"a267cf7b-c9cb-44ab-b4cd-1a2903b8f2ca":{"name":"mgmt158","type":"internal"}},"Bridge":{"6602557a-7e30-4dc7-a5f4-0eca29bfb2f3":{"ports":["set",[["uuid","4346c2cb-2f68-4a72-9c54-b1c561438eec"],["uuid","b1ea8a16-a3ed-4c65-bbaf-d961db7eca32"],["uuid","c0c8331e-354b-436f-be1f-04c785bdb10a"],["uuid","c15ac310-c6f9-427d-a3d3-035296c325a5"]]]}},"_comment":"ovs-vsctl: ovs-vsctl --timeout=5 -- --may-exist add-port vmbr0 mgmt158 tag=158 -- set Interface mgmt158 type=internal --","Open_vSwitch":{"796212bb-db53-4578-9d72-d06d723e5583":{"next_cfg":4}}} OVSDB JSON 160 e6b463920954ae8b1d63ba60c288f2ee82b2e862 {"_date":1436987682030,"Interface":{"a267cf7b-c9cb-44ab-b4cd-1a2903b8f2ca":{"ofport":5}},"Open_vSwitch":{"796212bb-db53-4578-9d72-d06d723e5583":{"cur_cfg":4}}} OVSDB JSON 114 4cc9441f8bae008c72cce1e42c2eb842cec66e03 {"Port":{"4346c2cb-2f68-4a72-9c54-b1c561438eec":{"bond_active_slave":"00:a0:d1:ea:a2:85"}},"_date":1436987686331} OVSDB JSON 674 2bf2bf53a25e10c1144490609a960855758b158c {"_date":1436988249724,"Port":{"55abe05a-e508-4e3d-9971-9cf42b31d552":{"name":"tap100i0","interfaces":["uuid","87b44c4b-8123-4e30-880d-7865fa9cb056"]}},"Interface":{"87b44c4b-8123-4e30-880d-7865fa9cb056":{"name":"tap100i0"}},"Bridge":{"6602557a-7e30-4dc7-a5f4-0eca29bfb2f3":{"ports":["set",[["uuid","4346c2cb-2f68-4a72-9c54-b1c561438eec"],["uuid","55abe05a-e508-4e3d-9971-9cf42b31d552"],["uuid","b1ea8a16-a3ed-4c65-bbaf-d961db7eca32"],["uuid","c0c8331e-354b-436f-be1f-04c785bdb10a"],["uuid","c15ac310-c6f9-427d-a3d3-035296c325a5"]]]}},"_comment":"ovs-vsctl: /usr/bin/ovs-vsctl add-port vmbr0 tap100i0","Open_vSwitch":{"796212bb-db53-4578-9d72-d06d723e5583":{"next_cfg":5}}} OVSDB JSON 160 fe52c4d6b136e32802a3d410319025b46649ed50 {"_date":1436988249725,"Interface":{"87b44c4b-8123-4e30-880d-7865fa9cb056":{"ofport":6}},"Open_vSwitch":{"796212bb-db53-4578-9d72-d06d723e5583":{"cur_cfg":5}}} root@pve1:~# ovs-dpctl show system@ovs-system: lookups: hit:97368456 missed:4177248 lost:0 flows: 138 masks: hit:551673431 total:6 hit/pkt:5.43 port 0: ovs-system (internal) port 1: vmbr0 (internal) port 2: eth0 port 3: eth1 port 4: bond0 (internal) port 5: ceph157 (internal) port 6: mgmt158 (internal) port 7: tap100i0 root@pve1:~# dmesg|tail [70679.622950] UDP: bad checksum. From 192.168.158.38:5404 to 239.192.72.34:5405 ulen 83 [70680.834679] UDP: bad checksum. From 192.168.158.37:5404 to 239.192.72.34:5405 ulen 1482 [70680.836025] UDP: bad checksum. From 192.168.158.34:5404 to 239.192.72.34:5405 ulen 821 [70680.838299] UDP: bad checksum. From 192.168.158.34:5404 to 239.192.72.34:5405 ulen 821 [70680.853189] UDP: bad checksum. From 192.168.158.34:5404 to 239.192.72.34:5405 ulen 821 [70680.854095] UDP: bad checksum. From 192.168.158.34:5404 to 239.192.72.34:5405 ulen 821 [70680.855628] UDP: bad checksum. From 192.168.158.34:5404 to 239.192.72.34:5405 ulen 821 [70680.856488] UDP: bad checksum. From 192.168.158.34:5404 to 239.192.72.34:5405 ulen 821 [70680.857216] UDP: bad checksum. From 192.168.158.34:5404 to 239.192.72.34:5405 ulen 821 [70683.642617] UDP: bad checksum. From 192.168.158.37:5404 to 239.192.72.34:5405 ulen 1481 [image: Avant logo] *Adam Thompson* Senior Systems Administrator *voice:* 204.789.9596 x24 | *email:* [email protected] | *web:* avant.ca
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