Corosync Communication Failure

This document (000020407) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server for SAP Applications
SUSE Linux Enterprise High Availability Extension

Situation

In an event of a corosync message exchange failure, the receiving node will complain that the expected message was not received, while the sending node would retry to send the message multiple times.

In the corosync logs, the following messages are indicative of a retransmission of messages:

2021-07-29 05:08:03 [node name] corosync: message repeated 156 times: [   [TOTEM ] Retransmit List: 1be7]
2021-07-29 05:09:07  [node name] corosync: [TOTEM ] Retransmit List: 1bef
2021-07-29 05:12:20  [node name] corosync: [TOTEM ] Retransmit List: 1c01
2021-07-29 05:12:20  [node name] corosync: [TOTEM ] Retransmit List: 1c01

If the number of rotations of the token without receiving the messages reaches fail_recv_const (default 2500), a FAILED TO RECEIVE error is logged and new membership is formed indicating the other member left. There is no wait time between the token rotations with message retransmission; 2500 retransmissions can be reached in 1-2 seconds. This condition will be shown in the corosync logs:

2021-07-29 06:31:44 [node name] corosync: [TOTEM ] FAILED TO RECEIVE
2021-07-29 06:31:44 [node name] corosync: [TOTEM ] A new membership (10.52.34.138:1416) was formed. Members left: 1
2021-07-29 06:31:44 [node name] corosync: [TOTEM ] Failed to receive the leave message. failed: 1

Resolution

A new corosync parameter cancel_token_hold_on_retransmit (default value 0) is introduced to enable the default behavior that the token is held when the number of retransmissions is too high. This introduces wait time for message retransmission and significantly reduces the situation from occurring.

A maintenance update has been released with a fix. Update corosync to the latest version or ensure the corosync version is at the following version or higher:

SUSE version	Corosync version
SLE 12 all SPs	corosync-2.3.6-9.19.1
SLE 15	corosync-2.4.5-5.13.1
SLE 15 SP1	corosync-2.4.5-9.16.1
SLE 15 SP2	corosync-2.4.5-10.14.6.1
SLE 15 SP3	corosync-2.4.5-12.3.1
SLE 15 SP4	corosync-2.4.5-12.7.1

Cause

The situation may occur during a short network glitch or AntiVirus scan which delays the corosync message packet transmission.

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

Document ID:000020407
Creation Date: 22-Mar-2023
Modified Date:22-Mar-2023
- SUSE Linux Enterprise High Availability Extension
- SUSE Linux Enterprise Server for SAP Applications

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