could not send data to server: Operation not supported

Hi:

A PHP script that is running every 30 minutes for three years has
crashed when updating a Postgres database table with this error message:

"pg_exec() query failed:  could not send data to server: Operation not
supported"

I just ran it again and it worked fine. I could not find a single page
about this error in Google. This is the output of the logfile:

LOG:  server process (PID 7069) was terminated by signal 11
LOG:  terminating any other active server processes
WARNING:  terminating connection because of crash of another server process
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.
HINT:  In a moment you should be able to reconnect to the database and
repeat your command.
LOG:  all server processes terminated; reinitializing
LOG:  database system was interrupted at 2005-09-26 16:49:43 CEST
LOG:  checkpoint record is at 125/858E0144
LOG:  redo record is at 125/858E0144; undo record is at 0/0; shutdown FALSE
LOG:  next transaction ID: 2270061; next OID: 30820346
LOG:  database system was not properly shut down; automatic recovery in
progress
LOG:  record with zero length at 125/858E0184
LOG:  redo is not required
LOG:  database system is ready
LOG:  unexpected EOF on client connection