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Maniphest T389914

Crash after disabling semi sync + start a master switchover process
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Description

During some of the stand by DC we've seen 3 crashes with the same pattern.
Disabling semi sync + moving the last replica made the DC master crash, so I've created a bug to MariaDB which has been confirmed: https://jira.mariadb.org/browse/MDEV-36359

The work around provided by MariaDB:

A work-around is to set rpl_semi_sync_master_wait_no_slave=1 temporarily before setting rpl_semi_sync_master_enabled=0 and keep it like that until all slaves have disconnected. This should prevent the master server from crashing.

This task is to track the resolution of the bug.

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Event Timeline

Marostegui created this task.Mar 25 2025, 6:21 AM
Restricted Application added a subscriber: Aklapper. · View Herald TranscriptMar 25 2025, 6:21 AM
Marostegui triaged this task as Medium priority.Mar 25 2025, 6:22 AM
Marostegui moved this task from Triage to Meta/Epic on the DBA board.
Marostegui added a comment.Mar 26 2025, 7:39 AM

It affects all releases starting from 10.6.18, 10.11.8, 11.0.6, 11.1.5, 11.2.4, 11.4.2, 11.5.1, 11.6.0, 11.7.0, 11.8.0 (https://jira.mariadb.org/browse/MDEV-36359?focusedCommentId=302193&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-302193)

Marostegui added a comment.Apr 23 2025, 11:40 AM

The fix has been merged: https://github.com/MariaDB/server/pull/3931
I am going to leave this open until this is released on the next version.

Marostegui closed this task as Resolved.May 22 2025, 7:49 AM

The new version with the fix has been released: T394623 https://mariadb.com/kb/en/mariadb-10-6-22-release-notes/

Replication
A primary server could crash when a semi-sync connection is stopped, if the primary previously disabled semi-sync replication while the connection was already up (and `rpl_semi_sync_master_wait_no_slave=0`). (MDEV-36359)
jcrespo mentioned this in T403966: MariaDB Pre-DC switchover tasks.Sep 8 2025, 2:31 PM
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