ORA-07445: exception encountered: core dump [kmmlrl()+6723] [SIGSEGV] [ADDR:0x8] [PC:0x8BB9B2D] [Address not mapped to object] []
Symptoms
After starting the database it goes down automatically with the following errors in the alert log file.
Completed: ALTER DATABASE OPEN
Fri Jul 14 14:08:33 2017
Exception [type: SIGSEGV, Address not mapped to object] [ADDR:0x8] [PC:0x8BB9B2D, kmmlrl()+6723]
Errors in file /Oracle/cig/app/cig/diag/rdbms/orcl/orcl/trace/orcl_pmon_14242.trc (incident=123636):
ORA-07445: exception encountered: core dump [kmmlrl()+6723] [SIGSEGV] [ADDR:0x8] [PC:0x8BB9B2D] [Address not mapped to object] []
Incident details in: /Oracle/cig/app/cig/diag/rdbms/orcl/orcl/incident/incdir_123636/orcl_pmon_14242_i123636.trc
Fri Jul 14 14:08:35 2017
Trace dumping is performing id=[cdmp_20170714140835]
Fri Jul 14 14:09:13 2017
DBRM (ospid: 14250): terminating the instance due to error 472
Solution
-----------
Step 1:
If you are using apex in your environment then comment the dispatcher patameter value in the parameter file and try to start the database.
Step 2:
Now the database will start normally,but if you set the dispatcher value it will work and the dispatcher value will be taken.
Step 3:
Now if you try to set the port for apex you will face the below error(for all the port it will throw the below error).
ORA-07445: exception encountered: core dump [kmmlrl()+6723] [SIGSEGV] [ADDR:0x8] [PC:0x8BB9B2D] [Address not mapped to object] []
Incident details in: /Oracle/cig/app/cig/diag/rdbms/orcl/orcl/incident/incdir_140436/orcl_pmon_15661_i140436.trc
Incident details in: /Oracle/cig/app/cig/diag/rdbms/orcl/orcl/incident/incdir_140436/orcl_pmon_15661_i140436.trc
Step 4:
Bounce the server and then set the port it will work fine,and apex will open.
The issue is that port number