CLSRSC-540: The root script failed to get a unique name of the OCR backup file on the ASM diskgroup

SYMPTOM

Rootupgrade.sh failed to upgrade GI from 12.1.0.2 to 12.2.0.1.

# /u01/app/12.2.0.1/grid/rootupgrade.sh
..
.
Relinking oracle with rac_on option
Using configuration parameter file: /u01/app/12.2.0.1/grid/crs/install/crsconfig_params
The log of current session can be found at:
 /u01/app/grid/crsdata/racnode1/crsconfig/rootcrs_racnode1_2018-02-05_12-10-50AM.log
2018/02/05 12:11:10 CLSRSC-595: Executing upgrade step 1 of 19: 'UpgradeTFA'.
2018/02/05 12:11:10 CLSRSC-4015: Performing install or upgrade action for Oracle Trace File Analyzer (TFA) Collector.
2018/02/05 12:12:44 CLSRSC-4003: Successfully patched Oracle Trace File Analyzer (TFA) Collector.
2018/02/05 12:12:44 CLSRSC-595: Executing upgrade step 2 of 19: 'ValidateEnv'.
2018/02/05 12:13:00 CLSRSC-595: Executing upgrade step 3 of 19: 'GenSiteGUIDs'.
2018/02/05 12:13:03 CLSRSC-595: Executing upgrade step 4 of 19: 'GetOldConfig'.
2018/02/05 12:13:03 CLSRSC-464: Starting retrieval of the cluster configuration data
2018/02/05 12:13:16 CLSRSC-515: Starting OCR manual backup.
2018/02/05 12:13:38 CLSRSC-540: The root script failed to get a unique name of the OCR backup file on the ASM diskgroup using CLSTEST_backup12.1.0.2.0.ocr.
Died at /u01/app/12.2.0.1/grid/crs/install/oraocr.pm line 1353.
The command '/u01/app/12.2.0.1/grid/perl/bin/perl -I/u01/app/12.2.0.1/grid/perl/lib -I/u01/app/12.2.0.1/grid/crs/install /u01/app/12.2.0.1/grid/crs/install/rootcrs.pl -upgrade' execution failed

‘rootcrs_racnode1_2018-02-05_12-10-50AM’ under ‘/u01/app/grid/crsdata/racnode1/crsconfig’

2018-02-05 12:13:37: ORACLE_SID = +ASM1
2018-02-05 12:13:37: ORACLE_HOME = /u01/app/12.1.0.2/grid
2018-02-05 12:13:37: leftVersion=12.1.0.2.0; rightVersion=12.1.0.0.0
2018-02-05 12:13:37: [12.1.0.2.0] is higher than [12.1.0.0.0]
2018-02-05 12:13:37: Running as user grid: /u01/app/12.1.0.2/grid/bin/asmcmd --nocp find --type "OCRBACKUP" "*" "*CLSTEST_backup12.1.0.2.0.ocr*"
2018-02-05 12:13:37: s_run_as_user2: Running /bin/su grid -c ' echo CLSRSC_START; /u01/app/12.1.0.2/grid/bin/asmcmd --nocp find --type "OCRBACKUP" "*" "*CLSTEST_backup12.1.0.2.0.ocr*" '
2018-02-05 12:13:38: Removing file /tmp/rpd0KsVwL2
2018-02-05 12:13:38: Successfully removed file: /tmp/rpd0KsVwL2
2018-02-05 12:13:38: pipe exit code: 0
2018-02-05 12:13:38: /bin/su successfully executed

2018-02-05 12:13:38: Return code: 0 
Output: +OCR_VOTE1/CLSTEST/OCRBACKUP/clstest_backup12.1.0.2.0.ocr.276.967291997

2018-02-05 12:13:38: Reset the environment variable 'ORACLE_HOME' as: /u01/app/12.2.0.1/grid
2018-02-05 12:13:38: Failed to get the OMF name of the OCR backup file on DG.
2018-02-05 12:13:38: Executing cmd: /u01/app/12.2.0.1/grid/bin/clsecho -p has -f clsrsc -m 540 "CLSTEST_backup12.1.0.2.0.ocr"
2018-02-05 12:13:38: Command output:
> CLSRSC-540: The root script failed to get a unique name of the OCR backup file on the ASM diskgroup using CLSTEST_backup12.1.0.2.0.ocr. 
>End Command output
2018-02-05 12:13:38: CLSRSC-540: The root script failed to get a unique name of the OCR backup file on the ASM diskgroup using CLSTEST_backup12.1.0.2.0.ocr.
2018-02-05 12:13:38: ###### Begin DIE Stack Trace ######
2018-02-05 12:13:38: Package File Line Calling 
2018-02-05 12:13:38: --------------- -------------------- ---- ----------
2018-02-05 12:13:38: 1: main rootcrs.pl 287 crsutils::dietrap
2018-02-05 12:13:38: 2: oraClusterwareComp::oraocr oraocr.pm 1353 main::__ANON__
2018-02-05 12:13:38: 3: crsupgrade crsupgrade.pm 1370 oraClusterwareComp::oraocr::backupOcr4Restore
2018-02-05 12:13:38: 4: crsupgrade crsupgrade.pm 817 crsupgrade::get_oldconfig_info
2018-02-05 12:13:38: 5: crsupgrade crsupgrade.pm 485 crsupgrade::CRSUpgrade
2018-02-05 12:13:38: 6: main rootcrs.pl 296 crsupgrade::new
2018-02-05 12:13:38: ####### End DIE Stack Trace #######

CAUSE

It is a bug.  Apply patch 27440094: 12.1.0.2 TO 12.2.0.1 :UPGRADE IS FAILING WITH CLSRSC-540.

WORKAROUD

There are two workarounds for this issue.

a)Apply patch 27440094: 12.1.0.2 TO 12.2.0.1 :UPGRADE IS FAILING WITH CLSRSC-540.

or

b)Reboot all the cluster nodes, and rerun “rootupgrade.sh” on all RAC nodes again.

After either a) or b), then manually complete as per “How to Complete Grid Infrastructure Configuration Assistant(Plug-in) if OUI is not Available (Doc ID 1360798.1)”