Michael Paquier f7dfccf960 Fix assertion failure with latch wait in single-user mode ...

LatchWaitSetPostmasterDeathPos, the latch event position for the
postmaster death event, is initialized under IsUnderPostmaster.
WaitLatch() considered it as a valid wait target in single-user mode
(!IsUnderPostmaster), which was incorrect.

One code path found to fail with an assertion failure is a database drop
in single-user mode while waiting in WaitForProcSignalBarrier() after
the drop.

Oversight in commit 84e5b2f07a.

Author: Patrick Stählin <me@packi.ch>
Co-authored-by: Ronan Dunklau <ronan.dunklau@aiven.io>
Discussion: https://postgr.es/m/18996-3a2744c8140488de@postgresql.org
Backpatch-through: 18

2025-07-25 16:17:31 +09:00

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