最近帮一个好哥们处理了一个数据库系统性能问题，经过分析awr报告查看官方文档，发现一处12.1.0.2的bug,正好客户有服务，开了SR，官方回复邮件确认此问题。

安装此版本的生产系统，可以把相关参数（_notify_crs=false）关闭掉。

部分awr截图如下：

APPLIES TO:

Oracle Database - Enterprise Edition - Version 11.2.0.3 and later
Information in this document applies to any platform.

SYMPTOMS

o Grid Infrastructure home and rdbms home is running on 11.2.0.3.7.
o Database instance fail to start, with ORA-7445 [strstr()]

o The failing process is gen0, and the current Wait Stack shows waiting for 'CRS call completion'

o The call stack of the error is:

ORA-07445: exception encountered: core dump [strstr()] [SIGSEGV] [ADDR:0x0] [PC:0x3EC307A310] [SI_KERNEL(general_protection)]

Call stack:

[]skdstdst<-ksedst1<-ksedst<-dbkedDefDump<-ksedmp<-ssexhd<-__sighandler<-strstr<-clsrapii_rem_dep

CAUSE

Due to

BUG 22999793 - ORA-07445 [__STRSTR_SSE42()+10] - SIMILAR TO BUG 17230892 THAT CT IS HITTING

SOLUTION

The bug fix is included in 12.2.0.2, request/apply the patch if there's an impact.

The workaround for successful startup of instance is by setting hidden parameter "_notify_crs"=false, which will prevent the database instance from notifying the CRS daemon process.