netdev - Re: [NET]: gen_estimator deadlock fix

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Date:	Thu, 12 Jul 2007 12:40:00 +0300
From:	Ranko Zivojnovic <ranko@...dernet.net>
To:	Jarek Poplawski <jarkao2@...pl>
Cc:	netdev@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [NET]: gen_estimator deadlock fix

On Thu, 2007-07-12 at 12:18 +0300, Ranko Zivojnovic wrote:
> > 
> > I've done a bit of mess last time, so maybe it was forgotten, but I
> > still think this kind of race is possible:
> > 
> > - gen_kill_estimator is called during qdisc_destroy under
> >   dev->queue_lock,
> > - est_timer is running and waiting on this lock just on the
> >   list entry of the destroyed class,
> > - gen_kill_estimator kills the entry and returns,
> > - in xxx_destroy_class kfree(cl) is done etc.,
> > - est_timer gets the lock and does nbytes = e->bstats->bytes or
> >   e->rate_est-bps = ... with freed memory.
> 
> Unfortunately I cannot say for sure that _currently_ anything really bad
> can happen here... someone with better knowledge will have to confirm
> this - Patrick?
> 

Oops - just saw it - and you even mention it up there: 

e->rate_est->bps = ...
          ^^^^
>
> Will have a new patch soon.
>

R.

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