linux-kernel - Re: fs: dcookie: freeing active timer

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Message-ID: <20140424172708.GY18016@ZenIV.linux.org.uk>
Date:	Thu, 24 Apr 2014 18:27:08 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Jan Kara <jack@...e.cz>, Dave Jones <davej@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: fs: dcookie: freeing active timer

On Thu, Apr 24, 2014 at 12:56:36PM -0400, Sasha Levin wrote:
> Hi all,
> 
> While fuzzing with trinity inside a KVM tools guest running the latest -next
> kernel I've stumbled on the following:

> [  191.871535] kmem_cache_destroy (mm/slab_common.c:363)
> [  191.871535] dcookie_unregister (fs/dcookies.c:302 fs/dcookies.c:343)

So it's dcookie_exit() doing kmem_cache_destroy(dcookie_cache) while
some timer is active?

Why does that code bother with destroying/creating that sucker dynamically?
Is there any point at all?
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