[ofa-general] perfquery causes kernel to be stuck in ib_unregister_mad_agent() function

[Dan Noe]

Or Gerlitz wrote:
> Jean-Francois.Neyroud wrote:
>> If I attemp to query at the same time the performance counters on all 
>> nodes on a cluster ( 40 nodes) .
>> perfquery causes kernel to be stuck in ib_unregister_mad_agent() 
>> function.
>> Impossible to send CTRL-C or CTRL-Z to perfquery, it is stuck in the 
>> kernel.
> maybe with
> $ dmesg -c
> $ echo 1 > /proc/sysrq-trigger
> $ echo t > /proc/sysrq-trigger

Hi,

Depending on how recent your kernel is, you can also echo d > 
/proc/sysrq-trigger which will show the state of currently held locks.

Hope that helps.

Cheers,
Dan

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                     |  Dan Noe
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