linux-kernel - Re: [syzbot] [ocfs2?] possible deadlock in ocfs2_reserve_local_alloc

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Message-ID: <20240915061811-mutt-send-email-mst@kernel.org>
Date: Sun, 15 Sep 2024 06:18:43 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: syzbot <syzbot+843fa26882088a9ee7e3@...kaller.appspotmail.com>
Cc: elic@...dia.com, jasowang@...hat.com, jlbec@...lplan.org,
	joseph.qi@...ux.alibaba.com, linux-kernel@...r.kernel.org,
	mark@...heh.com, ocfs2-devel@...ts.linux.dev,
	ocfs2-devel@....oracle.com, parav@...dia.com,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ocfs2?] possible deadlock in
 ocfs2_reserve_local_alloc_bits

On Sun, Sep 15, 2024 at 02:13:02AM -0700, syzbot wrote:
> syzbot has bisected this issue to:
> 
> commit a3c06ae158dd6fa8336157c31d9234689d068d02
> Author: Parav Pandit <parav@...dia.com>
> Date:   Tue Jan 5 10:32:03 2021 +0000
> 
>     vdpa_sim_net: Add support for user supported devices
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=174bbc77980000
> start commit:   0babf683783d Merge tag 'pinctrl-v6.11-4' of git://git.kern..
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=14cbbc77980000
> console output: https://syzkaller.appspot.com/x/log.txt?x=10cbbc77980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=1c9e296880039df9
> dashboard link: https://syzkaller.appspot.com/bug?extid=843fa26882088a9ee7e3
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=129a6407980000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=167617c7980000
> 
> Reported-by: syzbot+843fa26882088a9ee7e3@...kaller.appspotmail.com
> Fixes: a3c06ae158dd ("vdpa_sim_net: Add support for user supported devices")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection


something very weird going on here.
don't see how this can thinkably cause a deadlock in ocfs.