linux-kernel - Re: BUG: scheduling while atomic: ifconfig/0x00000002/4170

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Message-ID: <20070906083804.GB20644@paradigm.rfc822.org>
Date:	Thu, 6 Sep 2007 10:38:04 +0200
From:	Florian Lohoff <flo@...822.org>
To:	Satyam Sharma <satyam@...radead.org>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Netdev <netdev@...r.kernel.org>, linux-wireless@...r.kernel.org,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	ipw3945-devel@...ts.sourceforge.net, yi.zhu@...el.com
Subject: Re: BUG: scheduling while atomic: ifconfig/0x00000002/4170

On Thu, Sep 06, 2007 at 02:11:46PM +0530, Satyam Sharma wrote:
> On Thu, 6 Sep 2007, Herbert Xu wrote:
> 
> > On Thu, Sep 06, 2007 at 10:32:33AM +0530, Satyam Sharma wrote:
> > > 
> > > > > [  382.529041]  [<c02c8abc>] dev_close+0x24/0x67
> > > > > [  382.529052]  [<e01f402b>] ieee80211_master_stop+0x4a/0x6d [mac80211]
> > 
> > This is where the bug is.  You cannot call dev_close from an
> > atomic context as i33380211_master_stop does it within spin
> > locks.
> 
> Doh, of course! I must be blind ... and wait_for_completion()'s
> might_sleep() clearly didn't trigger earlier because Florian must've
> had CONFIG_DEBUG_SPINLOCK_SLEEP off in his .config ...

# CONFIG_DEBUG_SPINLOCK_SLEEP is not set

Exactly ...

Flo
-- 
Florian Lohoff                  flo@...822.org             +49-171-2280134
	Those who would give up a little freedom to get a little 
          security shall soon have neither - Benjamin Franklin

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