RHEL5 or RHEL6: System with mvfs gets hung, one process stuck in nfs_block_sillyrename indefinitely, blocks other processes that are waiting on an inode's i_mutex

Solution Verified - Updated -

Issue

  • server hung with a lot of D-state processes waiting on NFS mount point which is tied to mvfs ClearCase view
  • server hung with one process blocked inside nfs_block_sillyrename

Environment

  • Red Hat Enterprise Linux 5 or 6 (NFS / mvfs client)
    • seen on RHEL6 kernels 2.6.32-358.18.1.el6, 2.6.32-358.6.2.el6, 2.6.32-279.el6
    • seen on RHEL5 kernel 2.6.18-348.18.1.el5
  • IBM Rational ClearCase mvfs filesystem
    • as of April, 2015, all versions of ClearCase / MVFS believed to be affected
    • seen on MVFS version 8.0.0.9 (Tue Nov 19 06:04:11 2013)
    • seen on MVFS version 8.0.0.10 (Thu Feb 20 21:56:20 2014)

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