netdev - Re: [PATCH net-next V3 1/2] IB/ipoib: Add rtnl_link

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Message-ID: <1347462823.13103.1085.camel@edumazet-glaptop>
Date:	Wed, 12 Sep 2012 17:13:43 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Rami Rosen <roszenrami@...il.com>
Cc:	Or Gerlitz <ogerlitz@...lanox.com>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	Shlomo Pongratz <shlomop@...lanox.com>
Subject: Re: [PATCH net-next V3 1/2] IB/ipoib: Add rtnl_link_ops support

On Wed, 2012-09-12 at 17:53 +0300, Rami Rosen wrote:
> Hi,
> 
> From the dump of CPU #1, it seems indeed not related at all to "modprobe -r".
> 
> Could it be that there is some IB stack sysfs write activity?
> (regardless of the modprobe -r" you issued) ?  I see some candidates
> for it.
> 
> delete_child() is a method of the IB stack (ipoib/ipoib_main.c)
> 
> Maybe in order to help debug the problem, you might try to add in
> delete_child() method, print of the name of the attribute which is
> being deleted ?
> 
>   (struct device_attribute has a a member "struct attribute attr",
> which in turn has  "const char *name").


It might be related to module load/unload

udevd or some external daemon can access sysfs files while you unload
the module


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