linux-kernel - Re: v2.6.26-rc9: kernel BUG at kernel/sched.c:5858!

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Date:	Thu, 10 Jul 2008 16:03:25 +0200
From:	"Dmitry Adamushko" <dmitry.adamushko@...il.com>
To:	"Vegard Nossum" <vegard.nossum@...il.com>
Cc:	Yanmin <yanmin_zhang@...ux.intel.com>,
	"Rusty Russell" <rusty@...tcorp.com.au>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Dhaval Giani" <dhaval@...ux.vnet.ibm.com>,
	"Gautham R Shenoy" <ego@...ibm.com>,
	"Heiko Carstens" <heiko.carstens@...ibm.com>, miaox@...fujitsu.com,
	"Lai Jiangshan" <laijs@...fujitsu.com>,
	"Avi Kivity" <avi@...ranet.com>, linux-kernel@...r.kernel.org
Subject: Re: v2.6.26-rc9: kernel BUG at kernel/sched.c:5858!

2008/7/10 Vegard Nossum <vegard.nossum@...il.com>:
> On Thu, Jul 10, 2008 at 2:50 PM, Dmitry Adamushko
> <dmitry.adamushko@...il.com> wrote:
>> 2008/7/10 Vegard Nossum <vegard.nossum@...il.com>:
>>> On Thu, Jul 10, 2008 at 1:59 PM, Vegard Nossum <vegard.nossum@...il.com> wrote:
>>>> Hi,
>>>>
>>>> Looks like CPU hotplug still has some problems. Just got this on
>>>> latest mainline, and I couldn't find the exact same report on LKML
>>>> or kerneloops, maybe it can be helpful for debugging the existing
>>>> problem(s)?
>>>>
>
> [...]
>
>> Does a patch from Miao Xie available via the link below makes this
>> problem disappear? Both bugs are likely to have the same cause.
>>
>> http://lkml.org/lkml/2008/7/7/75
>
> Yep, it does, nice, thanks!
>
> Will these two patches (yours and Miao Xie's) be queued for 2.6.26 already?

Miao Xie's patch addresses a problem by fixing its consequence. In
general, an 'offline' cpu must not be visible for any kind of
load-balancing at this point. So I'd rather like to understand and
address the root cause of this mis-behavior.

Regarding new crashes. Do you get them

(1) after a few cpu offline / onlines ?
(2) on a freshly booted system?
(3) (1) or (2) but only with Miao Xie's patch (should not be (2) then)
(4) something else?

TIA,


-- 
Best regards,
Dmitry Adamushko
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