netdev - Re: [BUG] RTNL and flush_scheduled

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Message-ID: <20070216121245.GE1599@ff.dom.local>
Date:	Fri, 16 Feb 2007 13:12:45 +0100
From:	Jarek Poplawski <jarkao2@...pl>
To:	Ben Greear <greearb@...delatech.com>
Cc:	Stephen Hemminger <shemminger@...ux-foundation.org>,
	Francois Romieu <romieu@...zoreil.com>, netdev@...r.kernel.org,
	Kyle Lucke <klucke@...ibm.com>,
	Raghavendra Koushik <raghavendra.koushik@...erion.com>,
	Al Viro <viro@....linux.org.uk>
Subject: Re: [BUG] RTNL and flush_scheduled_work deadlocks

On Fri, Feb 16, 2007 at 10:04:25AM +0100, Jarek Poplawski wrote:
> On Fri, Feb 16, 2007 at 12:23:05AM -0800, Ben Greear wrote:
...
> > I don't see how asserting it in the rtnl_lock would help anything, 
> > because at that
> > point we are about to deadlock anyway...  (and this is probably very 
> > rare, as mentioned above.)
> 
> But it's happening now. Probably lockdep is not enough
> and rtnl_lock is probably used in too many places, so I
> meant some additional checks would be possible.

And of course it already could be done by DEBUG_MUTEXES or
DEBUG_SPINLOCK, so I gone too far and it's really bad idea.

Jarek P.
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