Yes, indeed there are some errors in postgres' log, but I cannot
identify the problem the db server has...
--snip--
2005-09-14 20:52:44 LOG: server process (PID 4760) was terminated by
signal 66
2005-09-14 20:52:44 LOG: terminating any other active server processes
2005-09-14 20:52:44 WARNING: terminating connection because of crash
of another server process
2005-09-14 20:52:44 DETAIL: The postmaster has commanded this server
process to roll back the current transaction and exit, because another
server process exited abnormally and possibly corrupted shared memory.
2005-09-14 20:52:44 HINT: In a moment you should be able to reconnect
to the database and repeat your command.
2005-09-14 20:52:44 WARNING: terminating connection because of crash
of another server process
2005-09-14 20:52:44 DETAIL: The postmaster has commanded this server
process to roll back the current transaction and exit, because another
server process exited abnormally and possibly corrupted shared memory.
2005-09-14 20:52:44 HINT: In a moment you should be able to reconnect
to the database and repeat your command.
[...]
--snip--