On 12/03/2013 15:57, Bart Van Assche wrote:
On 11/26/12 09:00, Or Gerlitz wrote:
On Fri, Nov 23, 2012 at 2:10 PM, Bart Van Assche <[email protected]>
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.
Yep, something goes wrong w.r.t to the interaction with sysfs and rtnl,
at some point very similar lockdep traces were sent to netdev from other
drivers and a generic solution was suggested, but I am not sure where
this has landed, see
http://marc.info/?l=linux-kernel&m=135293378513907&w=2
http://marc.info/?l=linux-netdev&m=135438302622434&w=2
Or.
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