PostgreSQL crashes

Hi,

We're using postgresql-8.3.5-1.

Lately, once in a while, the PostgreSQL service crashes and the
following appears in the log. Any idea what could cause that?

I believe there are two problems here: one is the process 2604 exiting
with code 128, and the other one is the re-initialization failure with
the following fatal message: "BST FATAL: pre-existing shared memory
block is still in use".

2009-05-27 10:39:41 BST LOG: server process (PID 2604) exited with exit
code 128

2009-05-27 10:39:41 BST LOG: terminating any other active server
processes

2009-05-27 10:39:41 BST WARNING: terminating connection because of
crash of another server process

2009-05-27 10:39:41 BST 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.

2009-05-27 10:39:41 BST HINT: In a moment you should be able to
reconnect to the database and repeat your command.

2009-05-27 10:39:41 BST WARNING: terminating connection because of
crash of another server process

2009-05-27 10:39:41 BST 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.

2009-05-27 10:39:41 BST HINT: In a moment you should be able to
reconnect to the database and repeat your command.

2009-05-27 10:39:41 BST WARNING: terminating connection because of
crash of another server process

2009-05-27 10:39:41 BST 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.

2009-05-27 10:39:41 BST HINT: In a moment you should be able to
reconnect to the database and repeat your command.

2009-05-27 10:39:41 BST WARNING: terminating connection because of
crash of another server process

2009-05-27 10:39:41 BST 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.

2009-05-27 10:39:41 BST HINT: In a moment you should be able to
reconnect to the database and repeat your command.

2009-05-27 10:39:41 BST WARNING: terminating connection because of
crash of another server process

2009-05-27 10:39:41 BST 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.

2009-05-27 10:39:41 BST HINT: In a moment you should be able to
reconnect to the database and repeat your command.

2009-05-27 10:39:41 BST WARNING: terminating connection because of
crash of another server process

2009-05-27 10:39:41 BST 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.

2009-05-27 10:39:41 BST HINT: In a moment you should be able to
reconnect to the database and repeat your command.

2009-05-27 10:39:41 BST LOG: all server processes terminated;
reinitializing

2009-05-27 10:39:42 BST FATAL: pre-existing shared memory block is
still in use

2009-05-27 10:39:42 BST HINT: Check if there are any old server
processes still running, and terminate them.

Thanks,

Moshe.

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