linux-kernel - Bisected: Massive memory leak in dm-snapshot in 3.1 development introduced

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Message-ID: <20111023112140.37fd8b3d@xenia.leun.net>
Date:	Sun, 23 Oct 2011 11:21:40 +0200
From:	Michael Leun <ml@...ton.leun.net>
To:	LKML <linux-kernel@...r.kernel.org>, dm-devel@...hat.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mikulas Patocka <mpatocka@...hat.com>
Subject: Bisected: Massive memory leak in dm-snapshot in 3.1 development
 introduced

Hi,

How to reproduce:

lvcreate -L30G -n testsnap vg1 # of course substitute VG as appropriate
dd if=/dev/zero of=/dev/vg1/testsnap bs=2M # to make things clear
lvcreate -L15G -s /dev/vg1/test -n testsnap
dd if=/dev/zero of=/dev/vg1/testsnap bs=2M &
watch free

I noticed roughly 1GB memory vanishing from free / -/+ buffers/cache
per 2GB copied.

Bisecting yielded a6e50b409d3f9e0833e69c3c9cca822e8fa4adbb, reverting
that from git master cures the memory leak

-- 
MfG,

Michael Leun

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