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 4327986a20c3b012bc1b6bef26a9fd4d64ebad7a..e9bf7f4303c2253e3a1356f2c04bfeaa46bdda12 100644 (file)
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -2948,7 +2948,7 @@ 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);