netdev - Re: deadlocks if use htb

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Message-ID: <20090114141311.GA6643@ff.dom.local>
Date:	Wed, 14 Jan 2009 14:13:11 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Denys Fedoryschenko <denys@...p.net.lb>,
	Chris Caputo <ccaputo@....net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Badalian Vyacheslav <slavon@...telecom.ru>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: deadlocks if use htb

On Wed, Jan 14, 2009 at 02:32:26PM +0100, Peter Zijlstra wrote:
> On Wed, 2009-01-14 at 13:26 +0000, Jarek Poplawski wrote:
> 
> > OK, I hope Denys can apply more, but what about others? Without any
> > patches the hole seems to be much bigger.
> 
> OK, I read most of this thread on netdev, but didn't find a clear clue
> on the specific hrtimer insertion race.

There is something at the beginning of this thread, plus earlier
threads mostly with Denys as sender, and "htb bug" in the subject.

> 
> Do you have any clear ideas or should I poke at the htb/hrtimer code a
> little?
> 

...And htb code is htb_dequeue(): qdisc_watchdog_schedule().

Jarek P.
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