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Commit6bfa88a

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Fix WAL replay of locking an updated tuple
We were resetting the tuple's HEAP_HOT_UPDATED flag as well as t_ctid onWAL replay of a tuple-lock operation, which is incorrect when the tupleis already updated.Back-patch to 9.3. The clearing of both header elements was therepreviously, but since no update could be present on a tuple that wasbeing locked, it was harmless.Bug reported by Peter Geoghegan and Greg Stark inCAM3SWZTMQiCi5PV5OWHb+bYkUcnCk=O67w0cSswPvV7XfUcU5g@mail.gmail.com andCAM-w4HPTOeMT4KP0OJK+mGgzgcTOtLRTvFZyvD0O4aH-7dxo3Q@mail.gmail.comrespectively; diagnosis by Andres Freund.
1 parent00976f2 commit6bfa88a

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‎src/backend/access/heap/heapam.c‎

Lines changed: 11 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -8016,11 +8016,19 @@ heap_xlog_lock(XLogRecPtr lsn, XLogRecord *record)
80168016

80178017
fix_infomask_from_infobits(xlrec->infobits_set,&htup->t_infomask,
80188018
&htup->t_infomask2);
8019-
HeapTupleHeaderClearHotUpdated(htup);
8019+
8020+
/*
8021+
* Clear relevant update flags, but only if the modified infomask says
8022+
* there's no update.
8023+
*/
8024+
if (HEAP_XMAX_IS_LOCKED_ONLY(htup->t_infomask))
8025+
{
8026+
HeapTupleHeaderClearHotUpdated(htup);
8027+
/* Make sure there is no forward chain link in t_ctid */
8028+
htup->t_ctid=xlrec->target.tid;
8029+
}
80208030
HeapTupleHeaderSetXmax(htup,xlrec->locking_xid);
80218031
HeapTupleHeaderSetCmax(htup,FirstCommandId, false);
8022-
/* Make sure there is no forward chain link in t_ctid */
8023-
htup->t_ctid=xlrec->target.tid;
80248032
PageSetLSN(page,lsn);
80258033
MarkBufferDirty(buffer);
80268034
UnlockReleaseBuffer(buffer);

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