RE: Possibly serious bug in ib_mad: processing packets from ibping can consume 100% of CPU and may leave user processes locked in umad_recv

I think there is. After I posted that trace I began running through the code - since the only (relevant) place agent_send_response is called is in response process_mad(), that is a distinct possibility. I've forwarded the information to the qib driver team.

If that's true, it would actually be good news - I posted the trace because was concerned that this could affect all fabrics.

-----Original Message-----
From: Hefty, Sean [mailto:sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org]
Sent: Thursday, February 09, 2012 2:57 AM
To: Mike Heinz; linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: Todd Rimmer
Subject: RE: Possibly serious bug in ib_mad: processing packets from ibping can consume 100% of CPU and may leave user processes locked in umad_recv

Subject: Possibly serious bug in ib_mad: processing packets from
ibping can consume 100% of CPU and may leave user processes locked in
umad_recv

Is there a chance that the low level driver is asking to send the MAD to itself over and over again?


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