InfiniBand IPoIB: Lockup in ib_sa_unregister_client

Solution Verified - Updated -

Issue

  • Hung task seen at shutdown after updating to RHEL 6.6 when 'Unloading OpenIB kernel modules'. The hung task is rmmod. The call trace shows the last call is in ib_sa_unregister_client().
  • When using IPoIB, one cannot leave and then rejoin multicast groups.

Environment

  • Red Hat Enterprise Linux 6.5
  • Red Hat Enterprise Linux 6.6
  • InfiniBand

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