RHEL6.2: NFSv4 client hangs and lot of process in D state, constant stream of NFS4ERR_EXPIRED (-10011) errors in tcpdump

Solution Unverified - Updated -

Issue

  • rhel6 nfs client hangs and lot of process in D state.
  • tcpdump of hung nfs client shows constant stream of NFS4ERR_EXPIRED (-10011) errors.
  • System while responsive would hang when access a file from a remote NFS share. We have several other hosts that access the same area remotely with no issues.
  • A reboot is required to recover.

Environment

  • Red Hat Enterprise Linux 6.2 or below
    • kernel version before 2.6.32-279.el6
  • NFSv4

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