linux-kernel - Re: [RFC PATCH 0/4] clockevents: fix clockevent_devices list corruption after cpu hotplug

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Message-ID: <4B53C7E0.1090201@redhat.com>
Date:	Mon, 18 Jan 2010 10:30:56 +0800
From:	Xiaotian Feng <dfeng@...hat.com>
To:	Ozan Çağlayan <ozan@...dus.org.tr>
CC:	Thomas Gleixner <tglx@...utronix.de>, damm@...l.co.jp,
	hsweeten@...ionengravers.com, akpm@...ux-foundation.org,
	venkatesh.pallipadi@...el.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/4] clockevents: fix clockevent_devices list corruption
 after cpu hotplug

On 01/17/2010 05:28 PM, Ozan Çağlayan wrote:
> Thomas Gleixner wrote:
>
>>
>> I'm not happy about that churn. Why don't we simply scan the
>> clockevent_devices list for leftovers of the dead CPU ?
>>
>> Untested patch below solves the same problem.
>
>
> Hi, I have 3 bug reports about a clockevent failure while halting the system (2.6.31.11 kernel).
> It exactly pinpoints to the line 262 which got changed with this patch merged to 2.6.31.10 (and also 2.6.32.3):
>
> [4406.986777] kernel BUG at kernel/time/clockevents.c:262!
> [4406.986777] invalid opcode: 0000 [#1] SMP
> [4406.986777] last sysfs file: /sysfs/module/ip_tables/initstate

I think this one is duplicated of 
http://bugzilla.kernel.org/show_bug.cgi?id=15037
Thomas is working on the fix. I've sent a workaround patch on
http://patchwork.kernel.org/patch/71537/

>
>
> All 3 systems have Pentium 4 processors with different clock speeds.
>
> Here's a screenshot of the full stacktrace:
> http://bugs.pardus.org.tr/attachment.cgi?id=4820
>
> and the relevant bugzilla report:
> http://bugzilla.kernel.org/show_bug.cgi?id=15073
>
> Thanks,
> Ozan Caglayan
> Pardus Linux -- http://www.pardus.org.tr/eng
>

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