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CONTAP-586796: Flexcache cache locks are not getting freed

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Issue

  • Buildup of lmgr locks until the limit is hit on a Flexcache cache volume : 

[NODE-01: wafl_exempt01: lmgr.lock.type.counts:notice]: The number of lock manager object types in pool NODE-01 are: share locks 1235301 byte locks 0 waiting locks 0 callback waiting 0 pfs (clustered Data ONTAP FlexCache delegations) 0 cached locks 0 WAN FlexCache delegations 0
[NODE-01: wafl_exempt10: ems.engine.suppressed:debug]: Event 'lmgr.owners.threshold.hit' suppressed 828732 times in last 901 seconds.
[NODE-01: wafl_exempt10: lmgr.owners.threshold.hit:error]: The current number of owner objects 1236210 with maximum limit of 1500000 has reached the threshold limit percentage of 80 for pool "NODE-01". The current number/limit of other lock manager objects are: files 276270/1500000, hosts 28/100000 and locks 1236402/3000000.
[NODE-01: wafl_exempt07: ems.engine.suppressed:debug]: Event 'lmgr.lock.type.counts' suppressed 217778 times in last 301 seconds.
[NODE-01: wafl_exempt07: lmgr.lock.type.counts:notice]: The number of lock manager object types in pool NODE-01 are: share locks 1236307 byte locks 0 waiting locks 0 callback waiting 0 pfs (clustered Data ONTAP FlexCache delegations) 0 cached locks 0 WAN FlexCache delegations 0
[NODE-01: wafl_exempt01: ems.engine.suppressed:debug]: Event 'lmgr.lock.type.counts' suppressed 201256 times in last 301 seconds.
[NODE-01: wafl_exempt01: lmgr.lock.type.counts:notice]: The number of lock manager object types in pool NODE-01 are: share locks 1237460 byte locks 0 waiting locks 0 callback waiting 0 pfs (clustered Data ONTAP FlexCache delegations) 0 cached locks 0 WAN FlexCache delegations 0
[NODE-01: wafl_exempt03: ems.engine.suppressed:debug]: Event 'lmgr.lock.type.counts' suppressed 215414 times in last 301 seconds.
[NODE-01: wafl_exempt03: lmgr.lock.type.counts:notice]: The number of lock manager object types in pool NODE-01 are: share locks 1238896 byte locks 0 waiting locks 0 callback waiting 0 pfs (clustered Data ONTAP FlexCache delegations) 0 cached locks 0 WAN FlexCache delegations 0
[NODE-01: wafl_exempt00: ems.engine.suppressed:debug]: Event 'lmgr.owners.threshold.hit' suppressed 636347 times in last 901 seconds.
[NODE-01: wafl_exempt00: lmgr.owners.threshold.hit:error]: The current number of owner objects 1240908 with maximum limit of 1500000 has reached the threshold limit percentage of 80 for pool "NODE-01". The current number/limit of other lock manager objects are: files 276559/1500000, hosts 28/100000 and locks 1241082/3000000.
[NODE-01: wafl_exempt10: lmgr.owners.limit.hit:error]: The number of owner objects 1500000 has reached the limit 1500000 for the pool NODE-01. The current number/limit of other lock manager objects are: files 305835/1500000 hosts 28/100000, locks 1500007/3000000.
[NODE-01: wafl_exempt02: ems.engine.suppressed:debug]: Event 'lmgr.lock.type.counts' suppressed 48798 times in last 301 seconds.
[NODE-01: wafl_exempt02: lmgr.lock.type.counts:notice]: The number of lock manager object types in pool NODE-01 are: share locks 1500007 byte locks 0 waiting locks 0 callback waiting 0 pfs (clustered Data ONTAP FlexCache delegations) 0 cached locks 0 WAN FlexCache delegations 0
[NODE-01: wafl_exempt07: ems.engine.suppressed:debug]: Event 'lmgr.lock.type.counts' suppressed 53154 times in last 301 seconds.
  • Other errors observed: 

 
[NODE-01: kernel: Nblade.streamMsg:debug]: params: {'errorCode': '7301', 'fileName': 'src/Protocols/Cifs/SmbRequests/Smb2CloseCmd.cpp', 'lineNumber': '999'}
[NODE-01: kernel: Nblade.streamMsg:debug]: params: {'errorCode': '7301', 'fileName': 'src/Protocols/Cifs/SmbRequests/Smb2CloseCmd.cpp', 'lineNumber': '999'}


  • Affected volumes are multi constituent Flexcache volumes: 

::*> vol show -is-constituent true
Vserver   Volume       Aggregate    State      Type       Size  Available Used%
--------- ------------ ------------ ---------- ---- ---------- ---------- -----
svm1      cachefg1__0001 cluster1_01_SSD_1 online RW    6.25GB     5.33GB   14%
svm1      cachefg1__0002 cluster1_02_SSD_1 online RW    6.25GB     5.33GB   14%
svm1      cachefg1__0003 cluster1_01_SSD_1 online RW    6.25GB     5.33GB   14%
svm1      cachefg1__0004 cluster1_02_SSD_1 online RW    6.25GB     5.30GB   15%
svm1      cachefg1__0005 cluster1_01_SSD_1 online RW    6.25GB     5.30GB   15%
svm1      cachefg1__0006 cluster1_02_SSD_1 online RW    6.25GB     5.33GB   14%
svm1      cachefg1__0007 cluster1_01_SSD_1 online RW    6.25GB     5.30GB   15%
svm1      cachefg1__0008 cluster1_02_SSD_1 online RW    6.25GB     5.33GB   14%
svm1      cachefg__0001 cluster1_02_SSD_1 online RW       50GB    49.50GB    1%
svm1      cachegroup__0001 cluster1_01_SSD_1 online RW  6.67GB     5.36GB   19%
svm1      cachegroup__0002 cluster1_02_SSD_1 online RW  6.67GB     5.32GB   20%
svm1      cachegroup__0003 cluster1_02_SSD_1 online RW  6.67GB     5.32GB   20%
svm1      cachegroup__0004 cluster1_01_SSD_1 online RW  6.67GB     5.38GB   19%
svm1      cachegroup__0005 cluster1_02_SSD_1 online RW  6.67GB     5.32GB   20%
svm1      cachegroup__0006 cluster1_01_SSD_1 online RW  6.67GB     5.34GB   19%

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