linux-kernel - Re: [syzbot] [reiserfs?] possible deadlock in super

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Date:   Mon, 9 Oct 2023 14:37:15 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     syzbot <syzbot+062317ea1d0a6d5e29e7@...kaller.appspotmail.com>
Cc:     axboe@...nel.dk, chao@...nel.org, daniel.vetter@...ll.ch,
        hdanton@...a.com, jack@...e.cz, jaegeuk@...nel.org,
        jinpu.wang@...os.com, linux-f2fs-devel@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        mairacanal@...eup.net, mcanal@...lia.com,
        reiserfs-devel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        terrelln@...com, willy@...radead.org, yukuai3@...wei.com
Subject: Re: [syzbot] [reiserfs?] possible deadlock in super_lock

On Sun, Oct 08, 2023 at 07:05:32PM -0700, syzbot wrote:
> syzbot has bisected this issue to:
> 
> commit 7908632f2927b65f7486ae6b67c24071666ba43f
> Author: Maíra Canal <mcanal@...lia.com>
> Date:   Thu Sep 14 10:19:02 2023 +0000
> 
>     Revert "drm/vkms: Fix race-condition between the hrtimer and the atomic commit"
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=17fc0565680000
> start commit:   2cf0f7156238 Merge tag 'nfs-for-6.6-2' of git://git.linux-..
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=14020565680000
> console output: https://syzkaller.appspot.com/x/log.txt?x=10020565680000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=710dc49bece494df
> dashboard link: https://syzkaller.appspot.com/bug?extid=062317ea1d0a6d5e29e7
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=107e9518680000
> 
> Reported-by: syzbot+062317ea1d0a6d5e29e7@...kaller.appspotmail.com
> Fixes: 7908632f2927 ("Revert "drm/vkms: Fix race-condition between the hrtimer and the atomic commit"")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

The bisect is obviously bogus. I haven't seend that bug report before
otherwise I would've already fixed this way earlier:

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git b4/vfs-fixes-reiserfs