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

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Date:   Mon, 25 Sep 2023 13:14:05 +0300
From:   Amir Goldstein <amir73il@...il.com>
To:     syzbot <syzbot+7a278bf8bfa794494110@...kaller.appspotmail.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-unionfs@...r.kernel.org, miklos@...redi.hu,
        mszeredi@...hat.com, reiserfs-devel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com,
        Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>
Subject: Re: [syzbot] [reiserfs?] possible deadlock in delete_one_xattr (2)

On Mon, Sep 25, 2023 at 9:04 AM syzbot
<syzbot+7a278bf8bfa794494110@...kaller.appspotmail.com> wrote:
>
> syzbot has bisected this issue to:
>
> commit 9df085f3c9a2d4658a9fe323d70c200aa00ede93
> Author: Amir Goldstein <amir73il@...il.com>
> Date:   Mon Sep 3 06:12:09 2018 +0000
>
>     ovl: relax requirement for non null uuid of lower fs
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1711e75a680000
> start commit:   ac9a78681b92 Linux 6.4-rc1
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=1491e75a680000
> console output: https://syzkaller.appspot.com/x/log.txt?x=1091e75a680000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=8bc832f563d8bf38
> dashboard link: https://syzkaller.appspot.com/bug?extid=7a278bf8bfa794494110
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1295e4b8280000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=140af20a280000
>
> Reported-by: syzbot+7a278bf8bfa794494110@...kaller.appspotmail.com
> Fixes: 9df085f3c9a2 ("ovl: relax requirement for non null uuid of lower fs")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

[CC the developers who marked reiserfs for deprecation]

Resierfs AND moving files underneath overlayfs.
Not worth much investigation time IMO.
If I could tell syzbot, ignore this report, I would.

Resierfs deletes xattrs from reiserfs_evict_inode() context,
which seems to be related to the lockdep warning.

Thanks,
Amir.