linux-kernel - Re: [tip:sched/urgent] sched: Check sched

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Date:	Thu, 21 Nov 2013 09:22:24 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	srikar@...ux.vnet.ibm.com, Thomas Gleixner <tglx@...utronix.de>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>
Subject: Re: [tip:sched/urgent] sched: Check sched_domain before computing
 group power

On Thu, Nov 21, 2013 at 7:03 AM, Peter Zijlstra <peterz@...radead.org> wrote:
>>
>> This one seems fix NULL reference in compute_group_power.
>>
>> but get following on current Linus tree plus tip/sched/urgent.
>>
>> divide error: 0000 [#1]  SMP
>> [   28.190477] Modules linked in:
>> [   28.192012] CPU: 11 PID: 484 Comm: kworker/u324:0 Not tainted
>> 3.12.0-yh-10487-g4b94e59-dirty #2044
>> [   28.210488] Hardware name: Oracle Corporation  Sun Fire
>> [   28.229877] task: ffff88ff25205140 ti: ffff88ff2520a000 task.ti:
>> ffff88ff2520a000
>> [   28.236139] RIP: 0010:[<ffffffff810d9ff4>]  [<ffffffff810d9ff4>]
>> find_busiest_group+0x2b4/0x8a0
>
> Hurmph.. what kind of hardware is that? and is there anything funny you
> do to make it do this?

intel nehanem-ex or westmere-ex 8 sockets system.

I tried without my local patches, the problem is still there.

Yinghai
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