[MDEV-30459] XID_cache_element can be modified after deletion Created: 2023-01-24  Updated: 2023-09-15

Status: Open
Project: MariaDB Server
Component/s: Replication
Affects Version/s: 10.3, 10.4, 10.5, 10.6, 10.7, 10.8, 10.9, 10.10, 10.11
Fix Version/s: 11.1

Type: Bug Priority: Major
Reporter: Brandon Nesterenko Assignee: Brandon Nesterenko
Resolution: Unresolved Votes: 0
Labels: None

Issue Links:
Issue split
split from MDEV-30423 Deadlock on Replica during BACKUP STA... Closed

 Description   

523f9ae7442 from MDEV-30423 reveals the possibility for leaks in XID_cache_element which allows for modification after deletion.

Suggested fix from Andrei is:

 xid_cache_delete may do extra marking at least for DBUG builds, that is in XID_cache_element::m_state and all its access  methods would assert that not_deleted status.

Though we only want to apply this to the newest version release, "unofficial" testing with the patch should be done in previous versions just in case.
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