Mikko Partio <mpartio(at)gmail(dot)com> writes:
> got the following line at postgresql log:
> May 16 01:17:35 xxx postgres[25550]: [1-1] LOG: could not truncate
> directory "pg_subtrans": apparent wraparound
> PostgreSQL 9.0beta1 on x86_64-unknown-linux-gnu, compiled by GCC gcc (GCC)
> 4.1.2 20080704 (Red Hat 4.1.2-46), 64-bit
Where did this beta1 installation come from --- was it freshly initdb'd
under 9.0, or did you use pg_upgrade on a pre-existing database that had
been around for awhile? It strikes me that the recently identified bug
in pg_upgrade about not fixing the datfrozenxid of template0 might
possibly explain this. You'd need to have upgraded an installation that
was at least a couple billion transactions old to hit that bug.
regards, tom lane