postmaster terminated abnormally..

Hi,

Under what circumstances would the postmaster receive signal 11
my postgres server crashed today and analysis of log yeilded
sig 11 is SIGSEGV . Any idea on how it prevent it?

Regds
rmallah.

LOG: server process (PID 19852) 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.
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.
WARNING: terminating connection because of crash of another server process

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