ping and ibnetdiscover not working with realtime kernel after opensm server is restarted

Solution Unverified - Updated -


We experienced some issue with our Infiniband infrastructure after the restart of our primary opensm server:

  • Some servers were not able to ping each other via IPoIB network while the ibping command worked fine.
  • The same servers were not able to execute ibnetdiscover command because it hanged.
  • The problem was not extended to all servers and we solved the issue via reboot of the affected nodes.
  • sometimes while switching between different opensm masters a random opensm client crashes and dumps a vmcore


  • Red Hat Enterprise Linux 6
  • kernel-3.0.36-rt57.66.el6rt.x86_64

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