Troubleshooting DB instance start fail ‘kggpnpInit: failed to init gpnp’ after apply DB PSU 11g,12c,18c,19c

ORACLE RAC环境记的之前GI和DB的version 前4位相同是可以兼容的,甚至有时DB PSU比GI PSU新,最近有朋友遇到只安装了DB PSU后,RAC中实例启动失败的问题, db alert show:
USER(3037)]CRS-2316:Fatal error: cannot initialize GPnP, CLSGPNP_ERR (Generic GPnP error).
kggpnpInit: failed to init gpnp
WARNING: No cluster interconnect has been specified

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