[MDEV-38212] MDEV-37686 Breaks Parallel Replication - Jira

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Details

Type: Bug
Status: Closed (View Workflow)
Priority: Blocker
Resolution: Fixed
Affects Version/s: 10.11.15, 11.4.9, 11.8.4, 12.1.2
Fix Version/s: 10.11.16, 11.4.10, 11.8.6, 12.2.2, 12.3.1
Component/s: Replication
Labels:

Bug Category:
Can result in hang or crash
Release Note Summary:

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~~MDEV-37686~~ fixes are reverted which should restore parallel slave functionality back to normal.

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MDEV-37686 fixes are reverted which should restore parallel slave functionality back to normal.
Sprint:
Q4/2025 Server Development

Description

To paraphrase knielsen:

The fix in ~~MDEV-37686~~ clears thd->rgi_slave without any locking or synchronization. This leads to segfaults in parallel replication if another worker thread is doing a deadlock kill on the THD, and getting the rgi_slave pulled out from under its feet.

Attachments

Issue Links

is caused by

MDEV-37686 rpl.create_or_replace_mix2 fails in MDEV-35915 branch

Closed

relates to

MDEV-37928 Assertion !thd->rgi_slave failed on ANALYZE TABLE on replica

Closed

MDEV-37941 Assertion `!thd->rgi_slave' failed on INSERT w/ parallel slave

In Testing

MDEV-38254 replicated temporary tables must not be accessed by start_new_trans

Closed

Activity

People

Assignee:: Brandon Nesterenko

Reporter:: Brandon Nesterenko

Votes:: 0 Vote for this issue

Watchers:: 4 Start watching this issue

Dates

Created:: 2025-11-26 17:10

Updated:: 5 days ago 19:59

Resolved:: 2025-12-04 18:34

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