linux-kernel - Re: BUG: tick device NULL pointer during system initialization and shutdown

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Message-ID: <51CA2CBF.70404@redhat.com>
Date:	Tue, 25 Jun 2013 19:50:23 -0400
From:	Prarit Bhargava <prarit@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>, athorlton@....com,
	CAI Qian <caiqian@...hat.com>
Subject: Re: BUG: tick device NULL pointer during system initialization and
 shutdown



On 06/24/2013 09:57 AM, Thomas Gleixner wrote:
> On Tue, 18 Jun 2013, Prarit Bhargava wrote:
> 
>> Similar panics reported during bringup here:
>>
>> http://lists.infradead.org/pipermail/linux-arm-kernel/2013-May/166205.html
>> http://lkml.org/lkml/2013/5/8/342
>>
>> I've seen this a few times on 3.10 based kernels.
>>
>> [  175.842027] Disabling non-boot CPUs ...
>> [  475.827017] BUG: unable to handle kernel NULL pointer dereference at
>> 0000000000000048
> 
> That looks like a stale bit in tick_broadcast_force_mask.
> 
> Does the patch below fix it?
>

Thomas,

Thanks for the patch.

The reproducibility appears to be quite low.  I'm seeing this roughly 1 time
every six hours of continuous system reboots.  I'm testing right now with your
patch.  I'll update the thread in a couple of days...

P.
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