RHEL6: If /proc/net/rpc/auth.unix.gid/channel is referred, the RPC time-out is generated.

Solution Verified - Updated -

Issue

  • Running sosreport on the NFS server causes NFS server to temporarily not respond to NFS client.
  • NFS server TCP ACKs NFS client requests, then silently drops them, never responding at the NFS layer.
  • NFS times out periodically with the following message seen in the log
kernel: nfs: server nfsserver not responding, still trying
  • If /proc/net/rpc/auth.unix.gid/channel is referred, the RPC time-out is generated e.g.
     # df
     Filesystem           1K-blocks      Used Available Use% Mounted on
     /dev/vda5             17906468  10171684   6825168  60% /
     tmpfs                  1027344        88   1027256   1% /dev/shm
     /dev/vda1               198337     28339    159758  16% /boot
     /dev/vda2              2015824     35812   1877612   2% /work
     df: `/mnt/nfs': Input/output error

Environment

  • Red Hat Enterprise Linux 6 (NFS server)
    • kernel-2.6.32-220.30.1.el6
    • nfs-utils-1.2.3-15.el6_2.1
    • sos greater than sos-2.2-29.el6 and earlier than sos-2.2-47.el6

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