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Amit Kapila e411371558 Fix self-deadlock during DROP SUBSCRIPTION. ... The DROP SUBSCRIPTION command performs several operations: it stops the subscription workers, removes subscription-related entries from system catalogs, and deletes the replication slot on the publisher server. Previously, this command acquired an AccessExclusiveLock on pg_subscription before initiating these steps. However, while holding this lock, the command attempts to connect to the publisher to remove the replication slot. In cases where the connection is made to a newly created database on the same server as subscriber, the cache-building process during connection tries to acquire an AccessShareLock on pg_subscription, resulting in a self-deadlock. To resolve this issue, we reduce the lock level on pg_subscription during DROP SUBSCRIPTION from AccessExclusiveLock to RowExclusiveLock. Earlier, the higher lock level was used to prevent the launcher from starting a new worker during the drop operation, as a restarted worker could become orphaned. Now, instead of relying on a strict lock, we acquire an AccessShareLock on the specific subscription being dropped and re-validate its existence after acquiring the lock. If the subscription is no longer valid, the worker exits gracefully. This approach avoids the deadlock while still ensuring that orphan workers are not created. Reported-by: Alexander Lakhin <exclusion@gmail.com> Author: Dilip Kumar <dilipbalaut@gmail.com> Reviewed-by: vignesh C <vignesh21@gmail.com> Reviewed-by: Hayato Kuroda <kuroda.hayato@fujitsu.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Backpatch-through: 13 Discussion: https://postgr.es/m/18988-7312c868be2d467f@postgresql.org		3 weeks ago
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backend	Fix self-deadlock during DROP SUBSCRIPTION.	3 weeks ago
bin	Restrict psql meta-commands in plain-text dumps.	1 month ago
common	With GB18030, prevent SIGSEGV from reading past end of allocation.	4 months ago
fe_utils	In fmtIdEnc(), handle failure of enlargePQExpBuffer().	7 months ago
include	Update obsolete comments in ResultRelInfo struct.	4 weeks ago
interfaces	Translation updates	1 month ago
makefiles	Refactor DLSUFFIX handling	4 years ago
pl	Translation updates	1 month ago
port	Make our usage of memset_s() conform strictly to the C11 standard.	4 months ago
template	On NetBSD, force dynamic symbol resolution at postmaster start.	3 years ago
test	Fix self-deadlock during DROP SUBSCRIPTION.	3 weeks ago
timezone	Update time zone data files to tzdata release 2025b.	4 months ago
tools	ci: Per-repo configuration for manually trigger tasks	4 weeks ago
tutorial	Doc: sync src/tutorial/basics.source with SGML documentation.	3 years ago
.gitignore	…
DEVELOPERS	…
Makefile	…
Makefile.global.in	Don't put library-supplied -L/-I switches before user-supplied ones.	1 month ago
Makefile.shlib	Stop using "-multiply_defined suppress" on macOS.	2 years ago
nls-global.mk	Improve frontend error logging style.	3 years ago