exadbcpatchmulti : Conflicts and ERROR: apply_async blocked on node

 Now a days i'm facing multiple issues on ExaCM boxes for patching on database nodes.

Sharing one scenario, Get request from customer apply APRIL_PSU2021 on ExaCM db boxes

ENV:
DB: 11204 version
GRID have 19c with APRIL2021 PSU.


*: Issue comes while running : exadbcpatchmulti -precheck_async 32537095 , failed with conflicts.
 Get details from exadbcpatch log / conflict log to identify more details.

*: How to resolve conflicts ?
Share the all details and conflict with oracle, They provide me the solution below
Edit /var/opt/oracle/exapatch/exadbcpatch.cfg - #For this file mostly root ownership, need to take help from GRID owner team or any other script available to update cfg file.

add the Cloud patch which needs to be rolled back as in below.
rollback_needed_before_apply="32328629::normal"

Refer Doc:
Exadbcpatchmulti patch conflict on cloud MLR "ERROR: precheck failed in conflict check" (Doc ID 2492936.1)

*: Now Pre-checks successfully done without any issue and move forward to apply the patch on next step.

*: Now facing the issue again : Node_1 successfully applied the patch but another issue occur on Node_2 below the details here.

++++++Error getting when apply patch: On Node_1 successfully done but having issue on Node_2
INFO: running on the node Xxx3a02c02vm01-adm
INFO: check for this action apply_async
INFO: check for this action rollback_async
INFO: Successfully released ohome lock. Proceeding to release local provisioning lock
INFO: Successfully released local provisioning lock
ERROR: apply_async blocked on node Xxx3a02c02vm01-adm: as Exadbcpatch operation already running on requested home
ERROR: apply_async blocked on node Xxx3a02c02vm01-adm: as Exadbcpatch operation already running on requested home

++++++Solution
execute on all the nodes then run exadbcpatchmulti again.
mv /var/opt/oracle/cstate.xml /var/opt/oracle/cstate.xml_old

Refer Doc:
Exadbcpatchmulti fails with Apply_async Blocked On Node X As Another Instance Of Exadbcpatch Running (Doc ID 2530468.1)

*: Now run exadbcpatchmulti  again and successfully applied the patch on ExaCM dbs.