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Amit Kapila 006dd4b2e5 Prevent invalidation of newly created replication slots. ... A race condition could cause a newly created replication slot to become invalidated between WAL reservation and a checkpoint. Previously, if the required WAL was removed, we retried the reservation process. However, the slot could still be invalidated before the retry if the WAL was not yet removed but the checkpoint advanced the redo pointer beyond the slot's intended restart LSN and computed the minimum LSN that needs to be preserved for the slots. The fix is to acquire an exclusive lock on ReplicationSlotAllocationLock during WAL reservation to serialize WAL reservation and checkpoint's minimum restart_lsn computation. This ensures that, if WAL reservation occurs first, the checkpoint waits until restart_lsn is updated before removing WAL. If the checkpoint runs first, subsequent WAL reservations pick a position at or after the latest checkpoint's redo pointer. We can't use the same fix for branch 17 and prior because commit 2090edc6f3 changed to compute to the minimum restart_LSN among slot's at the beginning of checkpoint (or restart point). The fix for 17 and prior branches is under discussion and will be committed separately. Reported-by: suyu.cmj <mengjuan.cmj@alibaba-inc.com> Author: Hou Zhijie <houzj.fnst@fujitsu.com> Reviewed-by: Vitaly Davydov <v.davydov@postgrespro.ru> Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Backpatch-through: 18 Discussion: https://postgr.es/m/5e045179-236f-4f8f-84f1-0f2566ba784c.mengjuan.cmj@alibaba-inc.com		1 week ago
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backend	Prevent invalidation of newly created replication slots.	1 week ago
bin	Fix some cases of indirectly casting away const.	2 weeks ago
common	Fix some cases of indirectly casting away const.	2 weeks ago
fe_utils	Add \pset options for boolean value display	2 months ago
include	Revise APIs for pushJsonbValue() and associated routines.	2 weeks ago
interfaces	ecpg: refactor to eliminate cast-away-const in find_variable().	2 weeks ago
makefiles	Remove traces of support for Sun Studio compiler	3 months ago
pl	Avoid memory leak in validation of a PL/Python trigger function.	2 months ago
port	Fix some cases of indirectly casting away const.	2 weeks ago
template	Remove traces of support for Sun Studio compiler	3 months ago
test	injection_points: Remove portions related to custom pgstats	2 weeks ago
timezone	Fix some cases of indirectly casting away const.	2 weeks ago
tools	injection_points: Remove portions related to custom pgstats	2 weeks ago
tutorial	Fix compile of src/tutorial/funcs.c	2 months ago
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Makefile	…
Makefile.global.in	Remove traces of support for Sun Studio compiler	3 months ago
Makefile.shlib	Use exported symbols list on macOS for loadable modules as well	6 months ago
meson.build	Update copyright for 2025	12 months ago
nls-global.mk	Fix update-po for the PGXS case	2 months ago