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Message-ID: <ef1625b5c6921289e2f87cdbb0101ff6301b2a7d.camel@decadent.org.uk>
Subject: Re: [PATCH 3.16 0/2] Fix FUSE read/write deadlock on stream-like
 files
From:   Ben Hutchings <ben@decadent.org.uk>
To:     Kirill Smelkov <kirr@nexedi.com>, stable@vger.kernel.org
Cc:     Sasha Levin <sashal@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Miklos Szeredi <miklos@szeredi.hu>,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Date:   Sun, 07 Jul 2019 15:03:45 +0100
In-Reply-To: <20190609135607.9840-1-kirr@nexedi.com>
References: <20190609135607.9840-1-kirr@nexedi.com>
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On Sun, 2019-06-09 at 15:41 +0000, Kirill Smelkov wrote:
> Hello stable team,
>=20
> Please consider applying the following 2 patches to Linux-3.16 stable
> tree. The patches fix regression introduced in 3.14 where both read and
> write started to run under lock taken, which resulted in FUSE (and many
> other drivers) deadlocks for cases where stream-like files are used with
> read and write being run simultaneously.
>=20
> Please see complete problem description in upstream commit 10dce8af3422
> ("fs: stream_open - opener for stream-like files so that read and write
> can run simultaneously without deadlock").
>=20
> The actual FUSE fix (upstream commit bbd84f33652f "fuse: Add
> FOPEN_STREAM to use stream_open()") was merged into 5.2 with `Cc:
> stable@vger.kernel.org # v3.14+` mark and is already included into 5.1,
> 5.0 and 4.19 stable trees. However for some reason it is not (yet ?)
> included into 4.14, 4.9, 4.4, 3.18 and 3.16 trees.
>=20
> The patches fix a real problem into which my FUSE filesystem ran, and
> which also likely affects OSSPD (full details are in the patches
> description). Please consider including the fixes into 3.16 (as well as
> into other stable trees - I'm sending corresponding series separately -
> - one per tree).
[...]

I've queued these up for 3.16, thanks.

Ben.

--=20
Ben Hutchings
Time is nature's way of making sure that
everything doesn't happen at once.


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