netdev - Re: [PATCH] Re: deadlocks if use htb

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Date:	Mon, 19 Jan 2009 10:42:29 +0300
From:	Badalian Vyacheslav <slavon@...telecom.ru>
To:	Jarek Poplawski <jarkao2@...il.com>
CC:	David Miller <davem@...emloft.net>, a.p.zijlstra@...llo.nl,
	denys@...p.net.lb, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, tglx@...utronix.de
Subject: Re: [PATCH] Re: deadlocks if use htb

Tested 2 days (weekend is stress days for this bug, because its have
many traffic) at 3 servers. Fly normal. For completed test need up to 7
days, but i think (imho) this patch not break any functional and may
safely added to stable. 100% help for me patch # 2+3.
> On Sun, Jan 18, 2009 at 09:46:04PM -0800, David Miller wrote:
>   
>> From: Jarek Poplawski <jarkao2@...il.com>
>> Date: Thu, 15 Jan 2009 06:53:22 +0000
>>
>>     
>>> (resend testing patch #4 - for 2.6.27 or 2.6.28)
>>>       
>> Jarek, if you deem that this is in fact what we should
>> submit for -stable please give me a submission with
>> a suitable commit message and signoffs, and I will queue
>> it up for -stable.
>>     
>
> It looks like this should be needed, but I think it's better to wait
> 2 or 3 days for "Tested-by" from Denys and/or maybe Vyacheslav yet.
> (I hoped they would rather test some hrtimers patch, but it looks like
> Peter was busy.)
>
> Thanks,
> Jarek P.
> -----------------> (needed only for -stables: 2.6.28 and older)
>
> pkt_sched: sch_htb: Fix deadlock in hrtimers triggered by HTB
>
> Most probably there is a (still unproven) race in hrtimers (before
> 2.6.29 kernels), which causes a corruption of hrtimers rbtree. This
> patch doesn't fix it, but should let HTB avoid triggering the bug.
>
> Reported-by: Denys Fedoryschenko <denys@...p.net.lb>
> Reported-by: Badalian Vyacheslav <slavon@...telecom.ru>
> Reported-by: Chris Caputo <ccaputo@....net>
> Signed-off-by: Jarek Poplawski <jarkao2@...il.com>
> ---
>
> 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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