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
shouldbe 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
shouldbe able to reconnect to the database and repeat your command. 
WARNING:  terminating connection because of crash of another server process



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