linux-kernel - Re: [PATCH v2] Revert "fuse: Apply flags2 only when userspace set the FUSE_INIT

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Date:   Wed, 25 Oct 2023 15:17:09 +0200
From:   Miklos Szeredi <mszeredi@...hat.com>
To:     Linux regressions mailing list <regressions@...ts.linux.dev>
Cc:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Paul Lawrence <paullawrence@...gle.com>,
        Daniel Rosenberg <drosen@...gle.com>,
        Alessio Balsini <balsini@...roid.com>,
        Amir Goldstein <amir73il@...il.com>,
        Bernd Schubert <bschubert@....com>,
        André Draszik <andre.draszik@...aro.org>
Subject: Re: [PATCH v2] Revert "fuse: Apply flags2 only when userspace set the FUSE_INIT_EXT"

On Wed, Oct 25, 2023 at 1:30 PM Linux regression tracking (Thorsten
Leemhuis) <regressions@...mhuis.info> wrote:

> Miklos, I'm wondering what the status here is. The description in the
> reverts André sent[1] are maybe a bit vague[2], but it sounds a lot like
> he ran into a big regression that should be addressed somehow -- maybe
> with a revert. But it seems we haven't got any closer to that in all
> those ~7 weeks since the first revert was posted. But I might be missing
> something, hence a quick evaluation from your side would help me a lot
> here to understand the situation.

I don't think the Android use case counts as a regression.

If they'd use an unmodified upstream kernel, it would be a different case.

But they modify the kernel heavily, and AFAICS this breakage is
related to such a modification (as pointed out by Bernd upthread).

André might want to clarify, but I've not seen any concrete real world
examples of regressions caused by this change outside of Android.

Thanks,
Miklos