linux-kernel - Re: [BUG] CFS vs cpu hotplug

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Message-ID: <486B2AB0.1080506@cn.fujitsu.com>
Date:	Wed, 02 Jul 2008 15:13:52 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Heiko Carstens <heiko.carstens@...ibm.com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Avi Kivity <avi@...ranet.com>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [BUG] CFS vs cpu hotplug

Ingo Molnar wrote:
> * Lai Jiangshan <laijs@...fujitsu.com> wrote:
> 
>> The following oops still occurred whether this patch is applied or not.
> 
>>  [<ffffffff8059372c>] notifier_call_chain+0x33/0x5b
>>  [<ffffffff802476a9>] __raw_notifier_call_chain+0x9/0xb
>>  [<ffffffff802476ba>] raw_notifier_call_chain+0xf/0x11
>>  [<ffffffff805736d6>] _cpu_down+0x191/0x256
>>  [<ffffffff805737c1>] cpu_down+0x26/0x36
>>  [<ffffffff805749c1>] store_online+0x32/0x75
>>  [<ffffffff803d1982>] sysdev_store+0x24/0x26
>>  [<ffffffff802d2551>] sysfs_write_file+0xe0/0x11c
>>  [<ffffffff80290e6b>] vfs_write+0xae/0x137
>>  [<ffffffff802913d3>] sys_write+0x47/0x70
>>  [<ffffffff8020b1eb>] system_call_after_swapgs+0x7b/0x80
> 
> hm, there were multiple problems in this area and a lot of dormant bugs. 
> Do you have this recent upstream commit in your tree:
Hi, Ingo
	I tested it again with the most recent upstreams(including the
following patch) committed, the oops still occurred.

Thanks, Lai Jiangshan

> 
> | commit fcb43042ef55d2f46b0efa5d7746967cef38f056
> | Author: Zhang, Yanmin <yanmin_zhang@...ux.intel.com>
> | Date:   Tue Jun 24 16:06:23 2008 +0800
> |
> |    x86: fix cpu hotplug crash
> |
> |    Vegard Nossum reported crashes during cpu hotplug tests:
> |
> |      http://marc.info/?l=linux-kernel&m=121413950227884&w=4
> 
> ?
> 
> 	Ingo
> 
> 
> 


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