Re: attempted to lock invisible tuple - PG 8.4.1

On 5 Oct 2009, at 8:58, Stuart Bishop wrote:

> I'm running our products test suite against PostgreSQL 8.4.1. The test
> suite runs fine against 8.3.7.
>
> With 8.4.1, some of our tests are failing with the exception
> 'attempted to lock invisible tuple'. The failures are repeatable -
> they crash every time at the same point. They crash no matter if they
> are being run in isolation or as part of the larger test suite.
>
> Anyone know what we could be doing that triggers that? Looking at our
> statement logs we don't seem to be doing anything unusual. The failing
> tests I've checked are running under SERIALIZABLE isolation level, and
> the database will have been recreated a few instants ago using
> 'createdb --template test_template_db'.

A similar issue was discussed just recently here: http://archives.postgresql.org/pgsql-general/2009-09/msg01219.php

That issue involved cursors though (and a serializable isolation
level, but you have that). Do you have any triggers that use cursors
on the table that the update fails for?

> One of the statement logs is at http://paste.ubuntu.com/285983/  - I
> can't see anything unusual
> going on but it might help diagnose the problem.

Alban Hertroys

--
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