can't start postgresql

Hi All,

I've got a problem w/ one of pgsql installations. It can't start:

[postgres@db ~]$ /usr/pgsql/bin/postgres -D /usr/pgsql/data
PANIC:  failed to re-find parent key in "23724"
Aborted

This is PostgreSQL 8.1.5 compiled from sources, on Fedora Core4. Originally it
was 8.1.2, and the bug appeared on v8.1.2; I've compiled and installed v8.1.5
over it. Autovacuum is enabled.

How can I fix this ?

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Best Regards,
Igor Shevchenko