[openib-general] oops after rmmod ib_cm when stopping iSER

[Erez Zilber]

Sean Hefty wrote:
> Erez Zilber wrote:
>> When stopping iSER, we run 'modprobe -r ib_iser'. Then, we see an 
>> oops (below). In order to check which module caused that oops, I 
>> replaced the 'modprobe -r' call with rmmod for each module:
>>
>> rmmod ib_iser
>> rmmod libiscsi
>> rmmod scsi_transport_iscsi
>> rmmod rdma_cm
>> rmmod ib_addr
>> rmmod ib_cm
>>
>> If I wait a few seconds before the removal of ib_cm, everything is ok.
>
> Thanks for the info.  My guess is that the cm_id's are not taking a 
> reference on the cm devices, which is allowing the module unload to 
> proceed while cm_id's still remain in timewait.  I will look at this 
> in more detail and work on a patch.  How reproducible is this?
>
> - Sean
100% reproducible. It happens every time.

Erez

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