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Assert that strong-lock count is >0 everywhere it's decremented.

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The one existing assertion of this type has tripped a few times in the
buildfarm lately, but it's not clear whether the problem is really
originating there or whether it's leftovers from a trip through one
of the other two paths that lack a matching assertion.  So add one.

Since the same bug(s) most likely exist(s) in the back-branches also,
back-patch to 9.2, where the fast-path lock mechanism was added.
This commit is contained in:
Robert Haas 2014-04-07 10:59:42 -04:00
parent b8a721149b
commit 315772e4ec
1 changed files with 2 additions and 0 deletions
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2
src/backend/storage/lmgr/lock.c
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@ -1541,6 +1541,7 @@ AbortStrongLockAcquire(void)
fasthashcode = FastPathStrongLockHashPartition(locallock->hashcode);
Assert(locallock->holdsStrongLockCount == TRUE);
SpinLockAcquire(&FastPathStrongRelationLocks->mutex);
Assert(FastPathStrongRelationLocks->count[fasthashcode] > 0);
FastPathStrongRelationLocks->count[fasthashcode]--;
locallock->holdsStrongLockCount = FALSE;
StrongLockInProgress = NULL;
@ -2953,6 +2954,7 @@ LockRefindAndRelease(LockMethod lockMethodTable, PGPROC *proc,
uint32 fasthashcode = FastPathStrongLockHashPartition(hashcode);
SpinLockAcquire(&FastPathStrongRelationLocks->mutex);
Assert(FastPathStrongRelationLocks->count[fasthashcode] > 0);
FastPathStrongRelationLocks->count[fasthashcode]--;
SpinLockRelease(&FastPathStrongRelationLocks->mutex);
}