netdev - Re: deadlocks if use htb

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Date:	Fri, 10 Oct 2008 14:32:50 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Jarek Poplawski <jarkao2@...il.com>
CC:	Badalian Vyacheslav <slavon@...telecom.ru>, netdev@...r.kernel.org,
	Denys <denys@...p.net.lb>
Subject: Re: deadlocks if use htb

Jarek Poplawski wrote:
> On 10-10-2008 07:44, Badalian Vyacheslav wrote:
>> Hello all!
> 
> Hello Slavon,
> 
>> Please look to if you have time:
>> http://bugzilla.kernel.org/show_bug.cgi?id=11718
>>
>> We have deadlocks at few PC one times in week.
>> I can test any patches to detect and fix problem.
>> Now i test 2.6.27-rc kernel at one PC.
> 
> A similar bug was reported by Denys Fedoryshchenko but it wasn't fully
> diagnosed. Anyway it looks like hardware dependent. The patch below
> can sometimes help. 2.6.27 may have this fixed too (some other way).

I doubt its hardware related, whats happening is that the hrtimer
insertion gets into an endless loop because the rb tree (or node)
apparently has a loop. I went through the qdiscs' use of hrtimers
again, but can't spot any error there.

Denys, did your systems also have CONFIG_HIGH_RES_TIMERS=n?
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