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

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Message-ID: <20111023134449.GA13703@agk-dp.fab.redhat.com>
Date:	Sun, 23 Oct 2011 14:44:49 +0100
From:	Alasdair G Kergon <agk@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Michael Leun <ml@...ton.leun.net>
Cc:	Alasdair G Kergon <agk@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, dm-devel@...hat.com,
	Mikulas Patocka <mpatocka@...hat.com>
Subject: Re: Bisected: Massive memory leak in dm-snapshot in 3.1
	development introduced

On Sun, Oct 23, 2011 at 12:52:06PM +0300, Linus Torvalds wrote:
> Mikulas, Alasdair? I see the mempool_free() for the "master job", what
> about everything else? Does the dm_kcopyd_prepare_callback() perhaps
> need to do a
> 
>     job->master_job = job;
> 
> or similar?

If you look at the other place that performs that mempool_alloc, it's indeed
present there.

Michael - can you test if this solves the problem?

Alasdair

--- a/drivers/md/dm-kcopyd.c
+++ b/drivers/md/dm-kcopyd.c
@@ -628,6 +628,7 @@ void *dm_kcopyd_prepare_callback(struct dm_kcopyd_client *kc,
 	job->kc = kc;
 	job->fn = fn;
 	job->context = context;
+	job->master_job = job;
 
 	atomic_inc(&kc->nr_jobs);
 
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