Could not truncate directory "pg_subtrans": apparent wraparound

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Hello

We got this error in our logs yesterday.

2013-11-17 19:01:02.278 CET,,,29356,,52565a6f.72ac,1,,2013-10-10
09:42:39 CEST,,0,LOG,00000,"could not truncate directory
""pg_subtrans"": apparent wraparound",,,,,,,,,""

2013-11-17 19:06:02.027 CET,,,29356,,52565a6f.72ac,2,,2013-10-10
09:42:39 CEST,,0,LOG,00000,"could not truncate directory
""pg_subtrans"": apparent wraparound",,,,,,,,,""

I have searched the archive for a similar subject but none of the
threads about this error came to a conclusion.

This postgres installation was done from scratch, the contents were
loded from pg_dump files, no replication, no HS, no pg_upgrade.

Any ideas?

$ ls -l $PGDATA/pg_subtrans/
total 8
- -rw-------. 1 postgres postgres 8192 Nov 18 10:46 0001

# SELECT txid_current();
txid_current
- --------------
67017
(1 row)

# SELECT txid_current_snapshot();
txid_current_snapshot
- -----------------------
67018:67018:

# SELECT version(); version

- ----------------------------------------------------------------------
PostgreSQL 9.1.9 on x86_64-unknown-linux-gnu, compiled by gcc (GCC)
4.4.7 20120313 (Red Hat 4.4.7-3), 64-bit

regards,
- --
Rafael Martinez Guerrero
Center for Information Technology
University of Oslo, Norway

PGP Public Key: http://folk.uio.no/rafael/
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