Errors in file /disk2/oracle/app/admin/jcq0/bdump/jcq01_lmon_20369.trc:
ORA-07445: exception encountered: core dump [proa_init()+9744] [SIGSEGV] [Address not mapped to object] [0x000000708] [] []
Tue Sep 22 23:32:57 2009
Trace dumping is performing id=[cdmp_20090922233257]
Tue Sep 22 23:33:14 2009
Errors in file /disk2/oracle/app/admin/jcq0/bdump/jcq01_pmon_20355.trc:
ORA-07445: exception encountered: core dump [_ndoprnt()+4] [SIGSEGV] [Address not mapped to object] [0xFFFFFFFF7FFF9820] [] []
Tue Sep 22 23:33:37 2009
PSP0: terminating instance due to error 472
Instance terminated by PSP0, pid = 20367
------------------------------------------------------------------------------------------------------------

Applies to:

Oracle Server - Enterprise Edition - Version: 10.2.0.4
This problem can occur on any platform.

Symptoms

The following errors were received in the alert log:

ORA-07445: exception encountered: core dump [proa_init()+9744] [SIGSEGV]
[Address not mapped to object] [0x000000708] [] []

ORA-07445: exception encountered: core dump [_aio_free_stack_unlocked()+76]
[SIGBUS] [Object specific hardware error] [0xFFFFFFFF78002000] [] []

ORA-00481: LMON process terminated with error

PMON: terminating instance due to error 481
Instance terminated by PMON, pid = 2584

Cause

Exhausted operating system resources.

Solution

Check the operating system logs for any problems related to resources, such as no available swap space.

Check the SGA requirements for the database and try reducing is swap space is sufficient.