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Commitf7dfccf

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michaelpqrdunklau
andcommitted
Fix assertion failure with latch wait in single-user mode
LatchWaitSetPostmasterDeathPos, the latch event position for thepostmaster 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 dropin single-user mode while waiting in WaitForProcSignalBarrier() afterthe drop.Oversight in commit84e5b2f.Author: Patrick Stählin <me@packi.ch>Co-authored-by: Ronan Dunklau <ronan.dunklau@aiven.io>Discussion:https://postgr.es/m/18996-3a2744c8140488de@postgresql.orgBackpatch-through: 18
1 parent2973b1c commitf7dfccf

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‎src/backend/storage/ipc/latch.c‎

Lines changed: 5 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -187,9 +187,11 @@ WaitLatch(Latch *latch, int wakeEvents, long timeout,
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if (!(wakeEvents&WL_LATCH_SET))
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latch=NULL;
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ModifyWaitEvent(LatchWaitSet,LatchWaitSetLatchPos,WL_LATCH_SET,latch);
190-
ModifyWaitEvent(LatchWaitSet,LatchWaitSetPostmasterDeathPos,
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(wakeEvents& (WL_EXIT_ON_PM_DEATH |WL_POSTMASTER_DEATH)),
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NULL);
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if (IsUnderPostmaster)
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ModifyWaitEvent(LatchWaitSet,LatchWaitSetPostmasterDeathPos,
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(wakeEvents& (WL_EXIT_ON_PM_DEATH |WL_POSTMASTER_DEATH)),
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NULL);
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if (WaitEventSetWait(LatchWaitSet,
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(wakeEvents&WL_TIMEOUT) ?timeout :-1,

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