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

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Message-ID: <20190807094759.GQ28208@suse.cz>
Date:   Wed, 7 Aug 2019 11:47:59 +0200
From:   David Sterba <dsterba@...e.cz>
To:     Sasha Levin <sashal@...nel.org>
Cc:     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 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.