NFS mount points got unmounted unexpectedly

This document (7022899) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 12 SP2
SUSE Linux Enterprise Server 12 SP1

Situation

Occasionally, some NFS mount points may get un-mounted unexpectedly.

Resolution

This bug is fixed in the following kernel versions:
For SLES12 SP2 : 4.4.90-92.45.1 or newer
For SLES12 SP1 LTSS : 3.12.74-60.64.82.1 or newer
 

Cause

This issue is caused by a bug in the NFS implementation.

Additional Information

If NFS debug log is enabled at the NFS Client side with the following setting:
  # sysctl -w sunrpc.nfs_debug=1023
  # sysctl -w sunrpc.rpc_debug=1023

The following type of NFS debug messages are printed when the issue occurred:
 NFS call  getattr
 RPC: 45631 call_start nfs3 proc GETATTR (sync)
 NFS reply getattr: -512
 nfs_revalidate_inode: (0:75/2) getattr failed, error=-512
 NFS: nfs_weak_revalidate: inode 2 is invalid
 ....
 NFS reply getattr: -512
 nfs_revalidate_inode: (0:76/36928) getattr failed, error=-512
 NFS: nfs_lookup_revalidate(/hr_interfaces) is invalid

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:7022899
  • Creation Date: 29-Apr-2018
  • Modified Date:23-Feb-2021
    • SUSE Linux Enterprise Server

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