[MDEV-24171] index_online_log is incorrectly instrumented as rw-lock, not mutex Created: 2020-11-09  Updated: 2020-11-10  Resolved: 2020-11-10

Status: Closed
Project: MariaDB Server
Component/s: Performance Schema, Storage Engine - InnoDB
Affects Version/s: 10.2, 10.3, 10.4, 10.5
Fix Version/s: 10.2.37, 10.3.28, 10.4.18, 10.5.9

Type: Bug Priority: Major
Reporter: Marko Mäkelä Assignee: Marko Mäkelä
Resolution: Fixed Votes: 0
Labels: None

Issue Links:
Blocks
blocks MDEV-24167 InnoDB unnecessarily uses complex rw-... Closed

 Description   

While working on MDEV-24167, I noticed that index_online_log is being instrumented as rw-lock, instead of being instrumented as a mutex. The exact consequences of this are unknown. The row_lock_t::mutex is only used during ALTER ONLINE TABLE when concurrent DML is being buffered or applied.
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