Deadlock in flush_workqueue() results in hung nfs clients

Solution Verified - Updated -

Issue

  • This is a request to backport a fix to 5.2.z,
  • Randomly, a customer's NFS automounts will deadlock in the workqueue code during unmount.
    
  • It results in uninterruptible processes and an unusable system.

Environment

  • Red Hat Enterprise Linux 5 Update 2
  • All architectures

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