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

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Message-ID: <53616F92.4020709@oracle.com>
Date:	Wed, 30 Apr 2014 17:48:02 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Al Viro <viro@...IV.linux.org.uk>
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>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Glauber Costa <glommer@...allels.com>,
	Christoph Lameter <cl@...ux.com>
Subject: Re: fs: dcookie: freeing active timer

On 04/24/2014 11:31 PM, Sasha Levin wrote:
> On 04/24/2014 07:49 PM, Al Viro wrote:
>> On Thu, Apr 24, 2014 at 10:55:58PM +0100, Al Viro wrote:
>>> On Thu, Apr 24, 2014 at 01:34:14PM -0400, Sasha Levin wrote:
>>>
>>>>> Why does that code bother with destroying/creating that sucker dynamically?
>>>>> Is there any point at all?
>>>>
>>>> I'm not sure about the dynamic allocation part, but I fear that if we just
>>>> switch to using static allocations it'll hide the underlying issue that
>>>> triggered this bug instead of fixing it.
>>>
>>> FWIW, slub.c variant of kmem_cache_destroy() is buggered - struct kobject
>>> embedded into struct kmem_cache, its ktype is slab_ktype, which has
>>> NULL ->release()...
>>
>> BTW, if your config has CONFIG_DEBUG_KOBJECT_RELEASE, that's exactly where
>> that warning comes from.  Got broken by commit b7454a,
>> Author: Glauber Costa <glommer@...allels.com>
>> Date:   Fri Oct 19 18:20:25 2012 +0400
>>
>>     mm/sl[au]b: Move slabinfo processing to slab_common.c
>>
>> We *do* need ->release().  Greg and guilty parties Cc'd...
> 
> We actually had that conversation a long time ago, and Christoph has
> sent out a patch to fix that (http://www.spinics.net/lists/netdev/msg259431.html).
> 
> I was assuming that it was merged upstream and went straight to blaming
> fs/ (and Greg's drivers/usb/ actually) without checking that first. Sorry!
> 
> Could someone pretty please merge that patch? Specially since Greg acked it?

Ping?

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