linux-kernel - Re: [PATCH v5] x86, cpu-hotplug: fix llc shared map unreleased during cpu hotplug

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Date:	Wed, 24 Sep 2014 07:48:43 +0800
From:	Wanpeng Li <kernellwp@...il.com>
To:	Borislav Petkov <bp@...en8.de>,
	Wanpeng Li <wanpeng.li@...ux.intel.com>
CC:	Ingo Molnar <mingo@...hat.com>, hpa@...or.com,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, x86@...nel.org,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Prarit Bhargava <prarit@...hat.com>,
	Steven Rostedt <srostedt@...hat.com>,
	Toshi Kani <toshi.kani@...com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5] x86, cpu-hotplug: fix llc shared map unreleased during
 cpu hotplug


于 14-9-23 下午5:37, Borislav Petkov 写道:
> On Wed, Sep 17, 2014 at 03:17:52PM +0800, Wanpeng Li wrote:
>> BUG: unable to handle kernel NULL pointer dereference at 0000000000000004
>> IP: [..] find_busiest_group
>> PGD 5a9d5067 PUD 13067 PMD 0
>> Oops: 0000 [#3] SMP
>> [...]
>> Call Trace:
>> load_balance
>> ? _raw_spin_unlock_irqrestore
>> idle_balance
>> __schedule
>> schedule
>> schedule_timeout
>> ? lock_timer_base
>> schedule_timeout_uninterruptible
>> msleep
>> lock_device_hotplug_sysfs
>> online_store
>> dev_attr_store
>> sysfs_write_file
>> vfs_write
>> SyS_write
>> system_call_fastpath
>>
>> This bug can be triggered by hot add and remove large number of xen
>> domain0's vcpus repeatedly.
>>
>> Last level cache shared map is built during cpu up and build sched domain
>> routine takes advantage of it to setup sched domain cpu topology, however,
>> llc shared map is unreleased during cpu disable which lead to invalid sched
>> domain cpu topology. This patch fix it by release llc shared map correctly
>> during cpu disable.
>>
>> Reviewed-by: Toshi Kani <toshi.kani@...com>
>> Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
>> Tested-by: Linn Crosetto <linn@...com>
>> Signed-off-by: Wanpeng Li <wanpeng.li@...ux.intel.com>
> Reviewed-by: Borislav Petkov <bp@...e.de>
>

Thanks.


Ingo, Peter Z, HPA,


Could this patch catch up with 3.18 merge window?

Regards,
Wanpeng Li

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