Re: BUG #5989: Assertion failure on UPDATE of big value

On 20.04.2011 18:08, Kevin Grittner wrote:
> "Marko Tiikkaja"<marko.tiikkaja@2ndquadrant.com>  wrote:
>
>> TRAP: FailedAssertion("!(((bool) (((void*)(&(newTuple->t_self)) !=
>> ((void *)0))&&  ((&(newTuple->t_self))->ip_posid != 0))))", File:
>> "predicate.c", Line: 2282)
>
> Am investigating, and have alerted Dan, in case he hasn't noticed
> this thread.

The immediate fix is trivial:

--- a/src/backend/access/heap/heapam.c
+++ b/src/backend/access/heap/heapam.c
@@ -2859,7 +2859,7 @@ l2:
          * Any existing SIREAD locks on the old tuple must be linked to
the new
          * tuple for conflict detection purposes.
          */
-       PredicateLockTupleRowVersionLink(relation, &oldtup, newtup);
+       PredicateLockTupleRowVersionLink(relation, &oldtup, heaptup);

         if (newbuf != buffer)
                 LockBuffer(newbuf, BUFFER_LOCK_UNLOCK);


But the question Tom raised about doing this even for non-serializable
transactions is more serious..


--
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com