recover in single-user backend fails

Hello,

When doing a recover in a single-user backend we get the following error:

$ postgres -D /var/lib/pgsql/data/ test

PANIC:  block 24929 unfound

Aborted.

All this was the result of an unclean postmaster shutdown while running a VACUUM in single-user backend.

PGVERSION=8.1.6

DB SIZE= +- 7GB

Thank you for the input!

Regards,

Wouter S.