Good day.
Commit "Fix corruption when relation truncation fails." [0] makes
smgrtruncate be called in a critical section. Unfortunately in version
13 it leads to occasional call to palloc0 inside of critical section,
which triggers Assert in debug builds:
- smgrtruncate calls mdtruncate
- mdtruncate may call register_dirty_segment
- register_dirty_segment calls RegisterSyncRequest
- RegisterSyncRequest calls ForwardSyncRequest
- ForwardSyncRequest may call CompactCheckpointerRequestQueue
- CompactCheckpointerRequestQueue may call palloc0 ...
In versions 14 and above CompactCheckpointerRequestQueue does check for
critical section due to commit "Fix bugs in MultiXact truncation" [1],
which were backported down to 14 version, but not 13.
We caught it in our private tests, so it is real.
Cherry-pick of [1] from 14 version to 13 solves the issue.
[0] https://git.postgresql.org/gitweb/?p=postgresql.git;h=2280912165d
[1] https://git.postgresql.org/gitweb/?p=postgresql.git;h=4c8e00ae9ae
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regards,
Yura Sokolov aka funny-falcon
