dear :
my os version is aix 6100-07-00-0000,oracle database version is Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production,my question is :
when i execute SQL>shutdwon immediate ,then
SQL> shutdown immediate
Database closed.
Database dismounted.
ORA-03113: end-of-file on communication channel
then i find the alert log ,the messages is
<msg time='2017-10-13T09:34:22.433+08:00' org_id='oracle' comp_id='rdbms'
msg_id='1882921322' type='INCIDENT_ERROR' group='Access Violation'
level='1' host_id='ibm' host_addr='101.96.129.59'
prob_key='ORA 7445 [ksmpclrpga()+22672]' upstream_comp='' downstream_comp='KSM'
ecid='' errid='33747' detail_path='/u01/app/oracle/diag/rdbms/prod3/prod3/trace/prod3_ora_13893776.trc'>
<txt>Errors in file /u01/app/oracle/diag/rdbms/prod3/prod3/trace/prod3_ora_13893776.trc (incident=33747):
ORA-07445: Message 7445 not found; No message file for product=RDBMS, facility=ORA; arguments: [ksmpclrpga()+22672] [SIGSEGV] [ADDR:0x109F04] [PC:0x101E9D690] [Invalid permissions for mapped object]
</txt>
</msg>
<msg time='2017-10-13T09:34:22.499+08:00' org_id='oracle' comp_id='rdbms'
msg_id='dbgexProcessError:1205:3370026720' type='TRACE' level='16'
host_id='ibm' host_addr='101.101.10.10'>
<txt>Incident details in: /u01/app/oracle/diag/rdbms/prod3/prod3/incident/incdir_33747/prod3_ora_13893776_i33747.trc
</txt>
</msg>
<msg time='2017-10-13T09:34:22.517+08:00' org_id='oracle' comp_id='rdbms'
type='UNKNOWN' level='16' host_id='ibm'
host_addr='101.101.10.10' pid='13893776'>
<txt>Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
</txt>
</msg>
then i find the /u01/app/oracle/diag/rdbms/prod3/prod3/trace/prod3_ora_13893776.trc ,
$ cat /u01/app/oracle/diag/rdbms/prod3/prod3/trace/prod3_ora_13893776.trc
Trace file /u01/app/oracle/diag/rdbms/prod3/prod3/trace/prod3_ora_13893776.trc
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
ORACLE_HOME = /u01/app/oracle/product/11.2.0/dbhome_1
System name: AIX
Node name: ibm
Release: 1
Version: 6
Machine: 0003545DD600
Instance name: prod3
Redo thread mounted by this instance: 1
Oracle process number: 19
Unix process pid: 13893776, image: oracle@ibm (TNS V1-V3)
*** 2017-10-13 22:03:40.261
*** SESSION ID:(96.3) 2017-10-13 22:03:40.261
*** CLIENT ID:() 2017-10-13 22:03:40.261
*** SERVICE NAME:(SYS$USERS) 2017-10-13 22:03:40.261
*** MODULE NAME:(sqlplus@ibm (TNS V1-V3)) 2017-10-13 22:03:40.261
*** ACTION NAME:() 2017-10-13 22:03:40.261
kwqmnich: current time:: 14: 3: 40: 0
kwqmnich: instance no 0 repartition flag 1
kwqmnich: initialized job cache structure
*** 2017-10-13 09:33:49.942
Stopping background process SMCO
*** 2017-10-13 09:33:52.977
Stopping background process QMNC
*** 2017-10-13 09:33:55.978
Stopping background process MMNL
*** 2017-10-13 09:33:58.979
Stopping background process MMON
ksukia: Starting kill, flags = 1
ksukia: killed 0 out of 0 processes.
*** 2017-10-13 09:34:09.071 4329 krsh.c
ARCH: Archival disabled due to shutdown: 1089
*** 2017-10-13 09:34:10.073 4329 krsh.c
ARCH: Archival disabled due to shutdown: 1089
*** 2017-10-13 09:34:22.248
Exception [type: SIGSEGV, Invalid permissions for mapped object] [ADDR:0x109F04DD0] [PC:0x101E9D690, ksmpclrpga()+22672] [flags: 0x0, count: 1]
DDE: Flood control is not active
Incident 33747 created, dump file: /u01/app/oracle/diag/rdbms/prod3/prod3/incident/incdir_33747/prod3_ora_13893776_i33747.trc
ORA-07445: Message 7445 not found; No message file for product=RDBMS, facility=ORA; arguments: [ksmpclrpga()+22672] [SIGSEGV] [ADDR:0x109F04] [PC:0x101E9D690] [Invalid permissions for mapped object]
ssexhd: crashing the process...
ksdbgcra: writing core file to directory '/u01/app/oracle/product/11.2.0/dbhome_1/dbs'
$
I really can not find out what is the cause of this problem, please help me, very very grateful, thank you!