Marcin <[EMAIL PROTECTED]> writes:
> Yesterday morning one of our PostgreSQL engines stopped unexpectedly,
> [ with SIGSEGV at ]
> (gdb) bt
> #0  0x081b4e79 in GetRawDatabaseInfo ()
> #1  0x081b4865 in InitPostgres ()
> #2  0x08154741 in PostgresMain ()

This suggests corrupted data in pg_database, probably a bad page header
or a bad item offset.

> The server is running for nearly two years now, with PostgreSQL for all
> the time, and as it's the first problem I encountered, I don't suspect
> it's a hardware fault.

I do ;-).  It would be interesting though to examine pg_database with
pg_filedump or a similar tool.  See
http://sources.redhat.com/rhdb/utilities.html
for pg_filedump.  Also, you might want to update to something newer than
7.4.1 --- I see at least one potentially relevant bug fix in the 7.4
branch CVS history.

                        regards, tom lane

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