Re: v3.7: Unloading ib_ipoib triggers circular locking dependency complaint

[Bart Van Assche <bvanassche-HInyCGIudOg@public.gmane.org>]

On 11/26/12 09:00, Or Gerlitz wrote:
> On Fri, Nov 23, 2012 at 2:10 PM, Bart Van Assche <bvanassche-HInyCGIudOg@public.gmane.org> wrote:
>> Apparently unloading the ib_ipoib kernel module triggers a circular locking
>> dependency complaint. Has anyone already been looking into this ?
>
> Yes, I see that this happens here e.g when doing hot-unplug to the
> underlying HW driver, seems related to the ipoib rtnl ops patches I
> pushed to 3.7 -- will look into this, thanks for bringing this up.
> Does anyone has an idea where the "s_active" lock is defined and what
> is its role?

(replying to an e-mail from a few months ago)

I still see this with kernel 3.8.0. This warning probably means that 
sysfs_remove_dir() is invoked with the rtnl lock held. If so I think 
that this can trigger a deadlock during module removal.

Bart.

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