InfiniBand IPoIB: Lockup in ib_sa_unregister_client
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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