From: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
---|---|
To: | pgsql-committers(at)postgresql(dot)org |
Subject: | pgsql: Fix HeapTupleSatisfiesVacuum on aborted updater xacts |
Date: | 2013-07-19 23:59:47 |
Message-ID: | E1V0KaR-0006q3-H0@gemulon.postgresql.org |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-committers |
Fix HeapTupleSatisfiesVacuum on aborted updater xacts
By using only the macro that checks infomask bits
HEAP_XMAX_IS_LOCKED_ONLY to verify whether a multixact is not an
updater, and not the full HeapTupleHeaderIsOnlyLocked, it would come to
the wrong result in case of a multixact containing an aborted update;
therefore returning the wrong result code. This would cause predicate.c
to break completely (as in bug report #8273 from David Leverton), and
certain index builds would misbehave. As far as I can tell, other
callers of the bogus routine would make harmless mistakes or not be
affected by the difference at all; so this was a pretty narrow case.
Also, no other user of the HEAP_XMAX_IS_LOCKED_ONLY macro is as
careless; they all check specifically for the HEAP_XMAX_IS_MULTI case,
and they all verify whether the updater is InvalidXid before concluding
that it's a valid updater. So there doesn't seem to be any similar bug.
Branch
------
REL9_3_STABLE
Details
-------
http://git.postgresql.org/pg/commitdiff/0b3859f3b607b375cfabb0a95bb4c58a4c1b37ee
Modified Files
--------------
src/backend/utils/time/tqual.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
From | Date | Subject | |
---|---|---|---|
Next Message | Alvaro Herrera | 2013-07-20 04:36:28 | Re: pgsql: Fix regex match failures for backrefs combined with non-greedy q |
Previous Message | Robert Haas | 2013-07-19 14:55:22 | pgsql: doc: Fix typos in conversion names. |