linux-kernel - Re: kmemleak: Unable to handle kernel paging request

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Message-ID: <CAOJe8K3LDhhPWbtdaWt23mY+2vnw5p05+eyk2D8fovOxC10cgA@mail.gmail.com>
Date:	Thu, 12 Jun 2014 11:39:11 +0400
From:	Denis Kirjanov <kda@...ux-powerpc.org>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: kmemleak: Unable to handle kernel paging request

On 6/12/14, Catalin Marinas <catalin.marinas@....com> wrote:
> On 11 Jun 2014, at 21:04, Denis Kirjanov <kda@...ux-powerpc.org> wrote:
>> On 6/11/14, Catalin Marinas <catalin.marinas@....com> wrote:
>>> On Wed, Jun 11, 2014 at 04:13:07PM +0400, Denis Kirjanov wrote:
>>>> I got a trace while running 3.15.0-08556-gdfb9454:
>>>>
>>>> [  104.534026] Unable to handle kernel paging request for data at
>>>> address 0xc00000007f000000
>>>
>>> Were there any kmemleak messages prior to this, like "kmemleak
>>> disabled"? There could be a race when kmemleak is disabled because of
>>> some fatal (for kmemleak) error while the scanning is taking place
>>> (which needs some more thinking to fix properly).
>>
>> No. I checked for the similar problem and didn't find anything relevant.
>> I'll try to bisect it.
>
> Does this happen soon after boot? I guess it’s the first scan
> (scheduled at around 1min after boot). Something seems to be telling
> kmemleak that there is a valid memory block at 0xc00000007f000000.

Yeah, it happens after a while with a booted system so that's the
first kmemleak scan.

> Catalin
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