Exadata: HOLD DISKMON KGZM_FENCE_ENTITY - ASM Unable To Access Cells Due To Cell Fencing
(Doc ID 1610017.1)
Last updated on FEBRUARY 03, 2019
Applies to:Oracle Database - Enterprise Edition - Version 220.127.116.11 and later
Information in this document applies to any platform.
Following error is seen on 18.104.22.168 old installation DISKMON daemon:
ORA-00600: internal error code, arguments: [kszaddossdev8], 
When trying to perform the downgrade from 22.214.171.124 to 126.96.36.199 (after a failed upgrade on the second node).
The following command run successfully on first node
[node1 ~]# /u01/app/188.8.131.52/grid/crs/install/rootcrs.pl -downgrade -force -oldcrshome /u01/app/184.108.40.206/grid -version 220.127.116.11.0
Successfully downgraded Oracle Clusterware stack on this node
First node has the old ocr backup:
[oracle@node1 cdata]$ ls -lart ocr*
-rw------- 1 root root 133692 Nov 23 14:41 ocr18.104.22.168.0
The downgrade failed on the second node:
[node2 ~]# /u01/app/22.214.171.124/grid/crs/install/rootcrs.pl -downgrade -force -lastnode -oldcrshome /u01/app/126.96.36.199/grid -version 188.8.131.52.0
CRS-2672: Attempting to start 'ora.asm' on 'ro02db01'
CRS-5017: The resource action "ora.asm start" encountered the following error:
ORA-03113: end-of-file on communication channel
Process ID: 20430
Session ID: 66 Serial number: 1CRS-2674: Start of 'ora.asm' on 'ro02db01' failed
CRS-4000: Command Start failed, or completed with errors.
Failed to start the Clusterware stack from the lower version
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