Avoid access to already-released lock in LockRefindAndRelease.

Spotted by Tom Lane.

diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index cd468bcc99c0eb4185bccdd877ff333c9dde32fe..723051efb50d7f764b10f4e0a4a9406e3de00bc2 100644 (file)
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -2949,7 +2949,7 @@ LockRefindAndRelease(LockMethod lockMethodTable, PGPROC *proc,
         * Decrement strong lock count.  This logic is needed only for 2PC.
         */
        if (decrement_strong_lock_count
-               && ConflictsWithRelationFastPath(&lock->tag, lockmode))
+               && ConflictsWithRelationFastPath(locktag, lockmode))
        {
                uint32          fasthashcode = FastPathStrongLockHashPartition(hashcode);