"No response from the backend" error while connecting to postgres db

Hi All

I am getting error "No response from the backend" while connecting to my
postgres database.

pg_log file logs the below messages :

GMT FATAL: semop(id=1310723) failed: Invalid argument

GMT FATAL: semop(id=1310723) failed: Invalid argument

GMT FATAL: semctl(1310723, 7, SETVAL, 0) failed: Invalid argument

GMT FATAL: semctl(1310723, 12, SETVAL, 0) failed: Invalid argument

GMT LOG: server process (PID 10776) exited with exit code 1

GMT LOG: terminating any other active server processes

GMT WARNING: terminating connection because of crash of another server
process

GMT DETAIL: The postmaster has commanded this server process to roll
back the current transaction and exit, because another server proc

ess exited abnormally and possibly corrupted shared memory.

GMT HINT: In a moment you should be able to reconnect to the database
and repeat your command.

The above message is printed a number of times and after that it prints

GMT LOG: all server processes terminated; reinitializing

GMT LOG: semctl(1245185, 0, IPC_RMID, ...) failed: Invalid argument

GMT LOG: semctl(1277954, 0, IPC_RMID, ...) failed: Invalid argument

GMT LOG: semctl(1310723, 0, IPC_RMID, ...) failed: Invalid argument

GMT LOG: semctl(1343492, 0, IPC_RMID, ...) failed: Invalid argument

GMT LOG: shmctl(2097152, 0, 0) failed: Invalid argument

GMT LOG: database system was interrupted at 2009-09-15 07:28:40 GMT

GMT LOG: checkpoint record is at A/2311BA94

GMT LOG: redo record is at A/23106A14; undo record is at 0/0; shutdown
FALSE

GMT LOG: next transaction ID: 20175128; next OID: 58650

GMT LOG: next MultiXactId: 1; next MultiXactOffset: 0

GMT LOG: database system was not properly shut down; automatic recovery
in progress

GMT LOG: redo starts at A/23106A14

GMT LOG: record with zero length at A/2317BF50

GMT LOG: redo done at A/2317BF28

GMT FATAL: the database system is starting up

GMT LOG: database system is ready

The postgresql log file doesn't print anything about restarting
postgres. I couldn't get any information from other logs regarding which
process was killed, who killed it and why.

Please help.

Thanks...

Tamanna