[ubuntu/saucy-updates] postgresql-9.1 9.1.11-0ubuntu0.13.10 (Accepted)
martin.pitt at ubuntu.com
Tue Dec 10 10:40:29 UTC 2013
postgresql-9.1 (9.1.11-0ubuntu0.13.10) saucy-proposed; urgency=low
* New upstream bug fix release. (LP: #1257211)
- Fix "VACUUM"'s tests to see whether it can update relfrozenxid.
In some cases "VACUUM" (either manual or autovacuum) could
incorrectly advance a table's relfrozenxid value, allowing tuples
to escape freezing, causing those rows to become invisible once
2^31 transactions have elapsed. The probability of data loss is
fairly low since multiple incorrect advancements would need to
happen before actual loss occurs, but it's not zero. Users
upgrading from releases 9.0.4 or 8.4.8 or earlier are not affected,
but all later versions contain the bug.
The issue can be ameliorated by, after upgrading, vacuuming all
tables in all databases while having vacuum_freeze_table_age set to
zero. This will fix any latent corruption but will not be able to
fix all pre-existing data errors. However, an installation can be
presumed safe after performing this vacuuming if it has executed
fewer than 2^31 update transactions in its lifetime (check this
with SELECT txid_current() < 2^31).
- Fix initialization of "pg_clog" and "pg_subtrans" during hot
This bug can cause data loss on standby servers at the moment they
start to accept hot-standby queries, by marking committed
transactions as uncommitted. The likelihood of such corruption is
small unless, at the time of standby startup, the primary server
has executed many updating transactions since its last checkpoint.
Symptoms include missing rows, rows that should have been deleted
being still visible, and obsolete versions of updated rows being
still visible alongside their newer versions.
This bug was introduced in versions 9.3.0, 9.2.5, 9.1.10, and
9.0.14. Standby servers that have only been running earlier
releases are not at risk. It's recommended that standby servers
that have ever run any of the buggy releases be re-cloned from the
primary (e.g., with a new base backup) after upgrading.
- See HISTORY/changelog.gz for details about other bug fixes.
Date: 2013-12-05 14:53:11.458796+00:00
Changed-By: Martin Pitt <martin.pitt at ubuntu.com>
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