linux-kernel - Re: [BUG] sched: tip/master show panic while booting/rebooting

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Date:	Tue, 25 Feb 2014 10:45:26 +0800
From:	Michael wang <wangyun@...ux.vnet.ibm.com>
To:	paulmck@...ux.vnet.ibm.com
CC:	a.p.zijlstra@...llo.nl, paulus@...ba.org,
	Ingo Molnar <mingo@...hat.com>, acme@...stprotocols.net,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] sched: tip/master show panic while booting/rebooting

Hi, Paul

On 02/25/2014 08:30 AM, Paul E. McKenney wrote:
[snip]
> 
> I don't see an opportunity for load_balance() to loop with interrupts
> disabled, but maybe I am looking at the wrong code.  The NMI handler
> looks to me like it is diagnosing rather than being the problem.

Thanks for the comment :)

It was a stuck inside pick_next_task_fair(), and we already got one
solution now ;-)

Regards,
Michael Wang

> 
> 							Thanx, Paul
> 
>>  [<ffffffff8108a88f>] idle_balance+0x10f/0x1c0
>>  [<ffffffff8108aa5e>] pick_next_task_fair+0x11e/0x2a0
>>  [<ffffffff8107bbf3>] ? dequeue_task+0x73/0x90
>>  [<ffffffff815717fa>] __schedule+0x12a/0x670
>>  [<ffffffff81571e19>] schedule+0x29/0x70
>>  [<ffffffff81067daf>] worker_thread+0x1bf/0x370
>>  [<ffffffff81067bf0>] ? manage_workers+0x160/0x160
>>  [<ffffffff8106e799>] kthread+0xc9/0xe0
>>  [<ffffffff8106e6d0>] ? flush_kthread_worker+0xb0/0xb0
>>  [<ffffffff8157d62c>] ret_from_fork+0x7c/0xb0
>>  [<ffffffff8106e6d0>] ? flush_kthread_worker+0xb0/0xb0
>> Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffff9fffffff)
> 
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