netdev - Re: deadlocks if use htb

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Date:	Fri, 10 Oct 2008 16:54:59 +0400
From:	Badalian Vyacheslav <slavon@...telecom.ru>
To:	Patrick McHardy <kaber@...sh.net>
CC:	Jarek Poplawski <jarkao2@...il.com>, netdev@...r.kernel.org,
	Denys <denys@...p.net.lb>
Subject: Re: deadlocks if use htb

Patrick McHardy пишет:
> Patrick McHardy wrote:
>> 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?
>
> Badalian, please try enabling CONFIG_DEBUG_OBJECTS and post the
> results, if any.

i have some results with CONFIG_HIGH_RES_TIMERS=n and
CONFIG_HIGH_RES_TIMERS=y
Ok... i recompile kernel... simple wait crash for reboot =)
Now i have pc:

1. 2.6.27 with patch
2. 2.6.26.6 with htb_hysteresis=1 and CONFIG_DEBUG_OBJECTS=n
3. 2.6.26.6 with htb_hysteresis=1 and CONFIG_DEBUG_OBJECTS=y (wait for
crash for reboot)
4. 2 servers deadlocked and not rebooted after panic (2.6.26.5
kernel)... need for drive to its for reboot...
5. 4 pc with 2.6.24-rc7-git2 that also do equal shaping but not have
crashes(its on other hardware)

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