linux-kernel - Re: [PATCH] block: kmemleak: Track the page allocations for struct request

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Message-ID: <CAJ75kXbz3Sz4Mm3grQBgUk6-VZXqsrEe0pZevE-s3C3PphhOOQ@mail.gmail.com>
Date:	Wed, 25 Nov 2015 12:04:20 +0100
From:	William Dauchy <wdauchy@...il.com>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Bart Van Assche <bart.vanassche@...disk.com>
Subject: Re: [PATCH] block: kmemleak: Track the page allocations for struct request

Hi Jens,

On Mon, Sep 14, 2015 at 7:21 PM, Jens Axboe <axboe@...nel.dk> wrote:
> On 09/14/2015 11:16 AM, Catalin Marinas wrote:
>>
>> The pages allocated for struct request contain pointers to other slab
>> allocations (via ops->init_request). Since kmemleak does not track/scan
>> page allocations, the slab objects will be reported as leaks (false
>> positives). This patch adds kmemleak callbacks to allow tracking of such
>> pages.
>>
>> Signed-off-by: Catalin Marinas <catalin.marinas@....com>
>> Reported-by: Bart Van Assche <bart.vanassche@...disk.com>
>> Tested-by: Bart Van Assche<bart.vanassche@...disk.com>
>> Cc: Christoph Hellwig <hch@...radead.org>
>> Cc: Jens Axboe <axboe@...nel.dk>
>> ---
>>
>> Jens,
>>
>> I just realised that no-one has picked this patch up for -rc1. It was
>> discussed here previously:
>>
>>
>> http://lkml.kernel.org/r/20150803104309.GB4033@e104818-lin.cambridge.arm.com
>>
>> Since it touches the block layer, are you fine with merging it?
>
>
> Yeah looks simple enough for me, not sure why it got missed. I'll add it for
> 4.4-rc1, thanks.

I saw the related kmemleaks reports on my v4.1.x kernel. Since it's
actually fixing these wrong reports, do you think it could be a good
candidate for -stable tree?

Thanks,
-- 
William
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