linux-kernel - Re: [PATCH AUTOSEL 4.19 12/32] Btrfs: fix deadlock between fiemap and transaction commits

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Date:   Wed, 7 Aug 2019 12:51:26 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     dsterba@...e.cz, Sasha Levin <sashal@...nel.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        David Sterba <dsterba@...e.com>,
        Filipe Manana <fdmanana@...e.com>, linux-btrfs@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 4.19 12/32] Btrfs: fix deadlock between fiemap
 and transaction commits

On Wed, Aug 07, 2019 at 11:47:59AM +0200, David Sterba wrote:
> On Tue, Aug 06, 2019 at 05:35:00PM -0400, Sasha Levin wrote:
> > From: Filipe Manana <fdmanana@...e.com>
> > 
> > [ Upstream commit a6d155d2e363f26290ffd50591169cb96c2a609e ]
> > 
> > Fixes: 03628cdbc64db6 ("Btrfs: do not start a transaction during fiemap")
> 
> The commit is a regression fix during the 5.2 cycle, how it could end up
> in a 4.19 stable candidate?
> 
> $ git describe  03628cdbc64db6
> v5.1-rc7-201-g03628cdbc64d
> 
> $ git describe --contains 03628cdbc64db6
> v5.2-rc1~163^2~26
> 
> And it does not belong to 5.2 either, git cherry-pick on top of 5.2
> fails.
> 
> I think such sanity check can be done automatically so the patches don't
> accidentally land in trees where don't belong.


Commit 03628cdbc64d ("Btrfs: do not start a transaction during fiemap")
was tagged for the stable trees, and ended up in the following releases:
	4.14.121 4.19.45 5.0.18 5.1.4 5.2
so yes, it does need to go back to all of those locations if this patch
really does fix the issue there.

thanks,

greg k-h