Skip to main content
NetApp Knowledge Base

Looping lock manager can lead to NFS outage or system panic on ONTAP 9

Views:
1,904
Visibility:
Public
Votes:
1
Category:
ontap-9
Specialty:
nas
Last Updated:

Applies to

  • ONTAP 9
  • NFS

Description

  • Clients see NFSv4 mount failures; SetclientID ops fail with nfs4err_delay.
  • System panic with panic string similar to the following: 
    • Panic string: process on cpu19 hung (wafl_exempt12) for 5001 milliseconds!
  • A defect was introduced in the lock manager that can be triggered by qtree create operations, disabling oplocks operations, aggregate relocation, sendhome operations, volume moves, node shutdowns, and during ONTAP upgrade. 
  • This includes upgrading to an ONTAP version where the fix is present.
  • The lock manager enters a lock recovery loop that starves the system of resources until:
    • NFS service ceases to respond to clients or
    • The system panics
  • This is being tracked by BUG 1168841

 

Sign in to view the entire content of this KB article.

New to NetApp?

Learn more about our award-winning Support

NetApp provides no representations or warranties regarding the accuracy or reliability or serviceability of any information or recommendations provided in this publication or with respect to any results that may be obtained by the use of the information or observance of any recommendations provided herein. The information in this document is distributed AS IS and the use of this information or the implementation of any recommendations or techniques herein is a customer's responsibility and depends on the customer's ability to evaluate and integrate them into the customer's operational environment. This document and the information contained herein may be used solely in connection with the NetApp products discussed in this document.

 

  • Was this article helpful?