linux-kernel - Re: BUG: unable to handle kernel NULL pointer dereference at 0000000000000500

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Date:	Fri, 28 Dec 2012 00:42:56 +0100
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Zlatko Calusic <zlatko.calusic@...on.hr>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>
Subject: Re: BUG: unable to handle kernel NULL pointer dereference at 0000000000000500

On Fri, Dec 28, 2012 at 12:39 AM, Zlatko Calusic
<zlatko.calusic@...on.hr> wrote:
> On 28.12.2012 00:30, Sedat Dilek wrote:
>>
>> Hi Zlatko,
>>
>> I am not sure if I hit the same problem as described in this thread.
>>
>> Under heavy load, while building a customized toolchain for the Freetz
>> router project I got a BUG || NULL pointer derefence || kswapd ||
>> zone_balanced || pgdat_balanced() etc. (details see my screenshot).
>>
>> I will try your patch from [1] ***only*** on top of my last
>> Linux-v3.8-rc1 GIT setup (post-v3.8-rc1 mainline + some net-fixes).
>>
>
> Yes, that's the same bug. It should be fixed with my latest patch, so I'd
> appreciate you testing it, to be on the safe side this time. There should be
> no difference if you apply it to anything newer than 3.8-rc1, so go for it.
> Thanks!
>

Not sure how I can really reproduce this bug as one build worked fine
within my last v3.8-rc1 kernel.
I increased the parallel-make-jobs-number from "4" to "8" to stress a
bit harder.
Just building right now... and will report.

If you have any test-case (script or whatever), please let me/us know.

Thanks.

- Sedat -

> Regards,
> --
> Zlatko
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