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Date: Tue, 7 Jun 2016 08:36:21 +0200
From: Christoph Hellwig <hch@lst.de>
To: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Catalin Marinas <catalin.marinas@arm.com>, Christoph Hellwig <hch@lst.de>,
        linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
        Jens Axboe <axboe@fb.com>, bart.vanassche@sandisk.com,
        drysdale@google.com
Subject: Re: kmemleak report after 9082e87bfbf8 ("block: remove struct
	bio_batch")
Message-ID: <20160607063621.GA12718@lst.de>
References: <20160606112620.GA29910@e104818-lin.cambridge.arm.com> <20160606141334.GA6579@lst.de> <20160606161245.GC29910@e104818-lin.cambridge.arm.com> <5756482D.2040505@lwfinger.net>
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On Mon, Jun 06, 2016 at 11:06:05PM -0500, Larry Finger wrote:
> The leak is definitely not related to mkfs. At the moment, my system has 
> been up about 26 hours, and has generated 162 of these leaks without ever 
> doing a single mkfs. In addition, the box say idle for almost 12 of those 
> hours.

That makes sense only if you are using ext4 that's doing discards/write_zero
at runtime.  Either way, can you please give the patch from Shaun a try?