CRS-6706: Oracle Clusterware Release patch level (‘0’) does not match Software patch level (‘3520846952’)

问题描述：
停掉RAC集群，rollback 所有补丁之后，集群启动报错CRS-6706

clscfg -localpatch
/grid/app/12.2.0/grid/crs/install/rootcrs.sh -lock

crsctl start crs

为root用户设置临时环境变量

export ORACLE_BASE=/grid/app/grid

执行如下命令，可以启动crs

export ORACLE_HOME=/grid/app/12.2.0/grid
${ORACLE_HOME}clscfg -localpatch
${ORACLE_HOME}/crs/install/rootcrs.sh -lock
ll ${ORACLE_HOME}/bin/oracle

确认是bin/oracle的权限是 -rwsr-s–x

不是的话，需要修改权限 chmod 6751 或者 chmod +s ${ORACLE_HOME}/bin/oracle

再次启动CRS成功
${ORACLE_HOME}/crsctl start crs

官方参考：
After patching manually on the 12.2 Grid Infrastructure home, the rootcrs.sh -postpatch fails with:

CRS-6706: Oracle Clusterware Release patch level (‘748994161’) does not match Software patch level (‘0’). Oracle Clusterware cannot be started.
CRS-4000: Command Start failed, or completed with errors.

SOLUTION
Please use the following steps to complete the patching:

1. Run the following command as the root user to complete the patching set up behind the scenes:
   #GI_HOME/bin:>
   ./clscfg -localpatch

2. Run the following command as the root user to lock the GI home:
   #GI_HOME/crs/install:>
   ./rootcrs.sh -lock

3. Run the following command as the root user to start the GI:
   #GI_HOME/bin:> .
   /crsctl start crs