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I can confirm that I have exactly the same problem, also on Dell
system, even with latest openpmpi.
Our system is:
ofed-1.4-21.12 from SUSE repositories.
But what I can also add, it not only affect openmpi, if this messages
are triggered after mpirun:
polling HP CQ with -2 errno says Success
Then IB stack hangs. You cannot even reload it, have to reboot node.