linux-kernel - Re: [syzbot] WARNING in get_vaddr

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Message-ID: <CAHk-=wh0=KdGcRGn4tMASp0ZMJH215Dw+5cFZgKZ=+ry5Kh7Rg@mail.gmail.com>
Date:   Sat, 21 Jan 2023 11:44:26 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     syzbot <syzbot+59a71007ccac79e8bb69@...kaller.appspotmail.com>
Cc:     hverkuil@...all.nl, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, m.szyprowski@...sung.com,
        mchehab@...nel.org, syzkaller-bugs@...glegroups.com,
        tfiga@...omium.org
Subject: Re: [syzbot] WARNING in get_vaddr_frames

On Sat, Jan 21, 2023 at 12:03 AM syzbot
<syzbot+59a71007ccac79e8bb69@...kaller.appspotmail.com> wrote:
>
> syzbot has bisected this issue to:
>
> commit 6647e76ab623b2b3fb2efe03a86e9c9046c52c33
> Author: Linus Torvalds <torvalds@...ux-foundation.org>
> Date:   Thu Dec 1 00:10:52 2022 +0000
>
>     v4l2: don't fall back to follow_pfn() if pin_user_pages_fast() fails

Yeah, that warning is kind of expected.

> Reported-by: syzbot+59a71007ccac79e8bb69@...kaller.appspotmail.com
> Fixes: 6647e76ab623 ("v4l2: don't fall back to follow_pfn() if pin_user_pages_fast() fails")

Is there a way to tell syzbot to ignore one particular warning?

Because we could certainly turn it into a pr_warn_once(), but
honestly, if a real use case sees this, I'd rather have the bigger
splat for a while yet.

Then we can remove it entirely (maybe in six months or something?)

                Linus