linux-kernel - Re: [PATCH -mm] only drop root anon

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Message-ID: <AANLkTiktcGrj-tcMspzR3sXplKk-PFB7M4q7rb-WiwYP@mail.gmail.com>
Date:	Fri, 11 Jun 2010 17:48:49 +0800
From:	Dave Young <hidave.darkstar@...il.com>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org
Subject: Re: [PATCH -mm] only drop root anon_vma if not self

On Fri, Jun 11, 2010 at 5:30 PM, Dave Young <hidave.darkstar@...il.com> wrote:
> On Fri, Jun 11, 2010 at 5:17 PM, Catalin Marinas
> <catalin.marinas@....com> wrote:
>> Dave Young <hidave.darkstar@...il.com> wrote:
>>> On Thu, Jun 10, 2010 at 7:21 PM, Catalin Marinas
>>> <catalin.marinas@....com> wrote:
>>>> On Thu, 2010-06-10 at 02:30 +0100, Dave Young wrote:
>>>>> On Thu, Jun 10, 2010 at 9:16 AM, Rik van Riel <riel@...hat.com> wrote:
>>>>> > On Wed, 9 Jun 2010 17:19:02 +0800
>>>>> > Dave Young <hidave.darkstar@...il.com> wrote:
>>>>> >
>>>>> >> > Manually bisected mm patches, the memleak caused by following patch:
>>>>> >> >
>>>>> >> > mm-extend-ksm-refcounts-to-the-anon_vma-root.patch
>>>>> >>
>>>>> >>
>>>>> >> So I guess the refcount break, either drop-without-get or over-drop
>>>>> >
>>>>> > I'm guessing I did not run the kernel with enough debug options enabled
>>>>> > when I tested my patches...
>>>>> >
>>>>> > Dave & Catalin, thank you for tracking this down.
>>>>> >
>>>>> > Dave, does the below patch fix your issue?
>>>>>
>>>>> Yes, it fixed the issue. Thanks.
>>>>
>>>> Thanks for investigating this issue.
>>>>
>>>> BTW, without my kmemleak nobootmem patch (and CONFIG_NOBOOTMEM enabled),
>>>> do you get other leaks (false positives).
>>>
>>> I didn't see difference before/after apply your patch, how to test
>>> specific to bootmem?
>>
>> With Rik's patch applied and CONFIG_NOBOOTMEM enabled, do you get any
>> false postives if my kmemleak patch isn't applied?
>
> No more, except a few acpi issue which always there
>

I got an oops when shutdown kvm guest with rik's patch applied, but
without your bootmem patch, is it kmemleak problem?

attached the screendump

>>
>> Thanks.
>>
>> --
>> Catalin
>>
>
>
>
> --
> Regards
> dave
>



-- 
Regards
dave

Download attachment "screendump_with_catlan.png" of type "image/png" (23964 bytes)