netdev - Re: deadlocks if use htb

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Date:	Thu, 15 Jan 2009 06:53:22 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Chris Caputo <ccaputo@....net>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Denys Fedoryschenko <denys@...p.net.lb>,
	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 06:02:04PM +0000, Chris Caputo wrote:
...
> That said, I would not recommend just the three for -stable unless they 
> get a much wider amount of testing, on multiple platforms.  I don't see 
> that as likely to happen, plus Peter says they are incomplete, so maybe it 
> is just best to recommend that 2.6.28 users getting crashes while using 
> HTB try these specific patches at first, and then the rest of the patches 
> if they do not work.

The main problem is my patches, at least the tested ones, harm htb's
exactness, and I doubt I could convince anybody to merege them, at
least before your case. It was only reported by two users here (plus
one more on private), and looked like something very rare. After your
report it looks much more necessary.

If there is nothing better, I can recommend it, but IMHO the best
candidate for this is the testing patch #4 from this thread, which
alas wasn't even tested... So, Chris, if you could give it a try in
the meantime (without any other patches)?

Thanks,
Jarek P.

(resend testing patch #4 - for 2.6.27 or 2.6.28)
---

diff -Nurp a2.6.27.7/net/sched/sch_htb.c b2.6.27.7/net/sched/sch_htb.c
--- a2.6.27.7/net/sched/sch_htb.c	2008-12-11 08:16:16.000000000 +0000
+++ b2.6.27.7/net/sched/sch_htb.c	2008-12-15 10:44:32.000000000 +0000
@@ -924,6 +924,7 @@ static struct sk_buff *htb_dequeue(struc
 		}
 	}
 	sch->qstats.overlimits++;
+	qdisc_watchdog_cancel(&q->watchdog);
 	qdisc_watchdog_schedule(&q->watchdog, next_event);
 fin:
 	return skb;
--
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