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CONTAP-120160: NFS v4.2-xattrs field getting flipped after upgrades

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ontap-9
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NAS
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Issue

  • Users are not able to mount NFS shares on Vservers (SVM) created in ONTAP pre-9.12.1
Note: Exposure to this defect is limited to SVMs that were created on a pre-9.12.1 release ONLY.

  • After upgrading ONTAP to 9.12.1, the NFS option "v4.2-xattrs" flips back and forth between enabled, disabled and re-enabled during first few hours.


     Example SKTRACE.GZ:
     [2024-01-07T09:23:41Z 1357141480396 [13:0] NfsInfo_1:  insertNfsOptions: EVENT: OPT_nfsV42XattrsEnable_MODIFIED, VS_ID: 4, old: 0, new: 1]
     [2024-01-07T09:24:01Z 1405731180402 [13:0] NfsInfo_1:  insertNfsOptions: EVENT: OPT_nfsV42XattrsEnable_MODIFIED, VS_ID: 3, old: 1, new: 0]
     [2024-01-07T09:24:01Z 1405763975674 [15:0] NfsInfo_1:  insertNfsOptions: EVENT: OPT_nfsV42XattrsEnable_MODIFIED, VS_ID: 4, old: 1, new: 0]


  • The v4.2-xattr option was never explicitly assigned a value before the ONTAP upgrade.
  • NFSv4.2 clients are not informed that the server's extended attributes option has changed, causing NFS response errors to specific xattr calls while the client and server mismatch.

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