psql not invoking ...

When I try to invoke psql the follwing error occurs. Can anybody tell what
is the solution?

-bash-2.05b$ psql testdb
DEBUG:  server process (pid 18048) was terminated by signal 11
DEBUG:  terminating any other active server processes
DEBUG:  all server processes terminated; reinitializing shared memory and
semaph
psql: server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.
-bash-2.05b$ DEBUG:  database system was interrupted at 2003-04-23 23:20:26
IST
DEBUG:  checkpoint record is at 0/187B68
DEBUG:  redo record is at 0/187B68; undo record is at 0/0; shutdown TRUE
DEBUG:  next transaction id: 103; next oid: 16557
DEBUG:  database system was not properly shut down; automatic recovery in
progre
DEBUG:  ReadRecord: record with zero length at 0/187BA8
DEBUG:  redo is not required
DEBUG:  database system is ready
-bash-2.05b$

regards,

Sooraj