linux-kernel - Re: [stable] [Stable-review] [116/165] ext4: dont return to userspace after freezing the fs with a mutex held

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Message-ID: <4C6265BE.7090509@canonical.com>
Date:	Wed, 11 Aug 2010 10:56:30 +0200
From:	Stefan Bader <stefan.bader@...onical.com>
To:	Greg KH <greg@...ah.com>
CC:	Eric Sandeen <sandeen@...hat.com>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Greg KH <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	stable@...nel.org, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, stable-review@...nel.org,
	alan@...rguk.ukuu.org.uk
Subject: Re: [stable] [Stable-review] [116/165] ext4: dont return to userspace
 after freezing the fs with a mutex held

On 08/10/2010 10:16 PM, Greg KH wrote:
> On Mon, Aug 09, 2010 at 11:00:43AM +0200, Stefan Bader wrote:
>> On 08/07/2010 03:38 PM, Eric Sandeen wrote:
>>> Henrique de Moraes Holschuh wrote:
>>>> On Mon, 02 Aug 2010, Greg KH wrote:
>>>>> On Mon, Aug 02, 2010 at 12:02:45PM -0500, Eric Sandeen wrote:
>>>>>> On 08/02/2010 07:04 AM, Stefan Bader wrote:
>>>>>>> We have reports about this patch breaking lvm snapshhots. Eric, there is a patch
>>>>>>> mentioned which is supposed to fix things but its not upstream, yet.
>>>>>>> Do you know what happened to that?
>>>>>> right, patch below is needed to fix things.
>>>>>>
>>>>>> Ted just acked it on the list recently; Greg, I'd either drop 116/165
>>>>>> for now, or include the patch below which should be upstream soon...
>>>>> I can't take anything that isn't upstream yet.
>>>>>
>>>>> And I just released with this patch in the kernel, should I do a revert
>>>>> and do a new release?
>>>>
>>>> Any answers on this?
>>>>
>>>
>>> Yes, I'd revert it for now, I'm afraid, if the other patch isn't upstream
>>> yet.
>>>
>>> Sorry about that,
>>>
>>> -Eric
>>
>> Upstream as of now (same SHA1 as in linux-next):
>>
>> >From 437f88cc031ffe7f37f3e705367f4fe1f4be8b0f Mon Sep 17 00:00:00 2001
>> From: Eric Sandeen <sandeen@...deen.net>
>> Date: Sun, 1 Aug 2010 17:33:29 -0400
>> Subject: [PATCH] (pre-stable) ext4: fix freeze deadlock under IO
> 
> It looks like I can't drop the original one, as this patch builds on it.
> So I'll just queue this one up.
> 
> Should it also go into other -stable releases (like .35 and/or .34 -stable?)
> 

Final call would be Eric/Ted but as far as I can see:

.34: not for now (patch that causes regression not backported there (yet))
.35: yes (offending patch has been in 2.6.35-rc1)

-Stefan

> thanks,
> 
> greg k-h

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