ORA-7445(kcsgrsn)错误(二)

之前记录过ORA-7445 [kcsgrsn]错误,但是上次记录的原因与SHUTDOWN有关,而这次显然是不一样的。
ORA-7445(kcsgrsn)错误:https://yangtingkun.net/?p=519
错误信息为:

Mon May 28 10:13:49 2012
Errors IN file /u01/app/oracle/admin/orcl/udump/orcl_ora_27407.trc:
ORA-03135: connection lost contact
Mon May 28 10:13:50 2012
Errors IN file /u01/app/oracle/admin/orcl/udump/orcl_ora_27407.trc:
ORA-07445: exception encountered: core dump [kcsgrsn()+336] [SIGSEGV] [Invalid permissions FOR mapped object] [0x0000006EC] [] []
ORA-03135: connection lost contact
Mon May 28 10:13:51 2012
Errors IN file /u01/app/oracle/admin/orcl/udump/orcl_ora_27407.trc:
ORA-07445: exception encountered: core dump [kcsgrsn()+336] [SIGSEGV] [Invalid permissions FOR mapped object] [0x0000006EC] [] []
ORA-07445: exception encountered: core dump [kcsgrsn()+336] [SIGSEGV] [Invalid permissions FOR mapped object] [0x0000006EC] [] []
ORA-03135: connection lost contact

发生错误前后都没有关闭数据库的信息,不过每次出现ORA-7445错误,都伴随着ORA-3135错误的产生,显然二者有直接的关系。
根据MOS上记录的信息,除了上一篇文章的由于数据库关闭导致这个问题之外,还有一种可能性,就是在进行redo的dump时可能引发这个错误。参考文档Ora-07445: Core Dump In Kcsgrsn [ID 418723.1],这个问题影响的版本从10.2.0.1一直到11g,可能在任何的平台上出现。但是这个ORA-600错误并非是问题的根本原因,而是由于其他原因导致会话异常,在进行REDO信息的DUMP时,引发了问题。常见引发这个ORA-600的错误就包括ORA-3135错误。
Oracle确认这个问题属于bug 5640904,除了针对该bug打补丁外,Oracle给出的建议是避免会话的意外中止。

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