1. OS 和DB 版本
DB Version： 9.2.0.6
OS Version：HP-UXiasd5_pb B.11.23 U ia64 0515426764 unlimited-user license
2.alert log
Thu Oct11 18:14:17 2012
Errors infile /oracle/product/9.2.0/rdbms/log/ingwdb_ora_17366.trc:
ORA-07445: exception encountered: core dump [0000000000000000][SIGSEGV] [Invalid permissions for mapped object] [0x000000000] [] []
Thu Oct11 18:15:10 2012
Errors infile /oracle/product/9.2.0/rdbms/log/ingwdb_ora_17665.trc:
ORA-07445:exception encountered: core dump [0000000000000000] [SIGSEGV] [Invalidpermissions for mapped object] [0x000000000] [] []
Thu Oct11 18:15:33 2012
Errors infile /oracle/product/9.2.0/rdbms/log/ingwdb_ora_18405.trc:
ORA-07445:exception encountered: core dump [9fffffff7f79e8b0] [SIGILL] [Illegal opcode][0x9FFFFFFF7F79E8B0] [] []
Fri Oct12 10:08:25 2012
Errors infile /oracle/product/9.2.0/rdbms/log/ingwdb_ora_6934.trc:
ORA-07445:exception encountered: core dump [0000000000000000] [SIGSEGV] [Invalidpermissions for mapped object] [0x000000000] [] []
Fri Oct12 10:08:53 2012
Errors infile /oracle/product/9.2.0/rdbms/log/ingwdb_ora_7134.trc:
ORA-07445:exception encountered: core dump [0000000000000000] [SIGSEGV] [Invalidpermissions for mapped object] [0x000000000] [] []
Fri Oct12 10:10:42 2012
Errors infile /oracle/product/9.2.0/rdbms/log/ingwdb_ora_8290.trc:
ORA-07445:exception encountered: core dump [9fffffff7f79e8b0] [SIGILL] [Illegal opcode][0x9FFFFFFF7F79E8B0] [] []
Fri Oct12 10:11:46 2012
Errors infile /oracle/product/9.2.0/rdbms/log/ingwdb_ora_9434.trc:
ORA-07445:exception encountered: core dump [0000000000000000] [SIGSEGV] [Invalidpermissions for mapped object] [0x000000000] [] []
Fri Oct12 10:45:00 2012
Errors infile /oracle/product/9.2.0/rdbms/log/ingwdb_ora_23859.trc:
ORA-07445:exception encountered: core dump [0000000000000000] [SIGSEGV] [Invalidpermissions for mapped object] [0x000000000] [] []
Fri Oct12 10:45:26 2012
Errors infile /oracle/product/9.2.0/rdbms/log/ingwdb_ora_25087.trc:
ORA-07445:exception encountered: core dump [0000000000000000] [SIGSEGV] [Invalidpermissions for mapped object] [0x000000000] [] []
Fri Oct12 10:47:14 2012
Errors infile /oracle/product/9.2.0/rdbms/log/ingwdb_ora_25149.trc:
ORA-07445:exception encountered: core dump [0000000000000000] [SIGSEGV] [Invalidpermissions for mapped object] [0x000000000] [] []
Fri Oct12 11:04:11 2012
Errors infile /oracle/product/9.2.0/rdbms/log/ingwdb_ora_4122.trc:
ORA-07445:exception encountered: core dump [0000000000000000] [SIGSEGV] [Invalidpermissions for mapped object] [0x000000000] [] []
3.Trace file
*** 2012-10-12 11:04:11.922
*** SESSION ID:(14.6203) 2012-10-1211:04:11.922
Exception signal: 11 (SIGSEGV), code: 2(Invalid permissions for mapped object), addr: 0x0, PC: [0x0, Cannot findsymbol in ?锜?
0000000000000000]
r1:9fffffff7f79f668 r20:40000000008d5170 br5: 0
r2:c0000000cb643000 r21:9fffffff7f5082a0 br6: 0
r3: 851b r22: 8 br7: e0000000015917e0
r4:9fffffff7f508d68 r23:656e71756575655f ip: 0
r5:9fffffffffff1dd8 r24: 8 iipa: 0
r6:9fffffffffff1dd4 r25: 8 cfm: 3
r7:9fffffffffff1de4 r26:40000000008d5178 um: 3a
r8: 0 r27: 9fffffff7f5082a8 rsc: 1f
r9:9fffffff7f740600 r28:40000000008d5170 bsp:9fffffff7f801938
r10: 0 r29: 9fffffff7f5082a0 bspstore: 9fffffff7f801938
r11:60000000003fdc30 r30: 0 rnat: 0
r12:9fffffffffff1150 r31: 0 ccv: 1
r13:9fffffff7f7cd420 NaTs: 0 unat: 0
r14:7265736f75726365 PRs: cc5b fpsr: 9804c8a74433f
r15:656e71756575655f br0:4000000002835ec0 pfs:c00000000000060f
r16: 2 br1: 0 lc: 0
r17:c0000000919d2800 br2: 0 ec: 0
r18:60000000003ec990 br3: 0 isr: 9fffffff7f801938
r19: 73 br4: 0 ifa: 0
Reason code: 0052
*** 2012-10-12 11:04:11.923
ksedmp: internal or fatal error
ORA-07445: exception encountered: core dump[0000000000000000] [SIGSEGV] [Invalid permissions for mapped object][0x000000000] [] []
Current SQL statement for this session:
INSERT INTOSTATS$RESOURCE_LIMIT ( SNAP_ID , DBID , INSTANCE_NUMBER , RESOURCE_NAME ,CURRENT_UTILIZATION , MAX_UTILIZATION , INITIAL_ALLOCATION , LIMIT_VALUE )SELECT :B3 , :B2 , :B1 , RESOURCE_NAME , CURRENT_UTILIZATION , MAX_UTILIZATION, INITIAL_ALLOCATION , LIMIT_VALUE FROM V$RESOURCE_LIMIT WHERE LIMIT_VALUE != 'UNLIMITED' AND MAX_UTILIZATION > 0
----- PL/SQL Call Stack -----
object line object
handle number name
c00000009284ced8 2235 package body PERFSTAT.STATSPACK
c00000009284ced8 91 package body PERFSTAT.STATSPACK
c000000093a2f120 1 anonymous block
4.定位问题与解决方案
在Oracle 9.2.0.6 下的bug 3628622 引起。 当对V$RESOURCE_LIMIT 进行select 和 insert时有2个相关的bug：
Bug 4171822 : SELECT * FROM V$RESOURCE_LIMIT FAILS WITH ORA-07445:
ORA-7445[Qerfxfetch] On Insert Into STATS$RESOURCE_LIMIT [ID 742723.1](bug 3628622)
根据trace 文件中的信息，我们这里的是insert时触发的ORA-7445。所以对应bug：3628622。
该bug不会对数据库产生影响，Oracle 对该bug 并没有提供one-off的patch，所以要解决该bug就必须将数据库升级到更高的版本。 建议升级到11.2.0.3.4.
5.导致该问题的本质原因
触发该bug的本质原因在MOS的另一篇文章里有说明：
ORA-7445 Errors on Itanium Platforms due toItanium Symbol Preemption [ID 302172.1]
Cause
Due to Intel's ELF ABI Architecture onItanium Platforms code constructs like:
(*function_pointer)(<list ofparameters>)
i.e. dereferencing a function pointervariable allows for symbol preemption.
On Itanium global variables are adressedindirectly through a global offset process table. The offsets are relative tothe global pointer address (gp).
At runtime due to symbol preemption thefunction pointer address may end up at a location where it cannot be directlyaddressed from the gp value.
This was seen to happen with Oraclefunction pointer variables which were stored in and later reread from the SGA.
As a result the process could not find theexecutable code address and terminated with SIGSEGV.
