linux-kernel - Re: [syzbot] possible deadlock in virtual_nci

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Message-ID: <CACT4Y+bbU1_NFP995Gd2btvwUZdNe0t7kw+vzzuXvqFTDm5seA@mail.gmail.com>
Date:   Tue, 22 Nov 2022 14:08:02 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+8040d16d30c215f821de@...kaller.appspotmail.com>
Cc:     bongsu.jeon@...sung.com, clement.perrochaud@....com,
        davem@...emloft.net, hdanton@...a.com,
        krzysztof.kozlowski@...aro.org, kuba@...nel.org,
        linux-kernel@...r.kernel.org, michael.thalmeier@...e.at,
        netdev@...r.kernel.org, r.baldyga@...sung.com,
        robert.dolca@...el.com, sameo@...ux.intel.com, shikha.singh@...com,
        syzkaller-bugs@...glegroups.com, thierry.escande@...ux.intel.com
Subject: Re: [syzbot] possible deadlock in virtual_nci_close

On Wed, 16 Nov 2022 at 06:58, syzbot
<syzbot+8040d16d30c215f821de@...kaller.appspotmail.com> wrote:
>
> syzbot has bisected this issue to:
>
> commit e624e6c3e777fb3dfed036b9da4d433aee3608a5
> Author: Bongsu Jeon <bongsu.jeon@...sung.com>
> Date:   Wed Jan 27 13:08:28 2021 +0000
>
>     nfc: Add a virtual nci device driver
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1093fb59880000
> start commit:   094226ad94f4 Linux 6.1-rc5
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=1293fb59880000
> console output: https://syzkaller.appspot.com/x/log.txt?x=1493fb59880000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=7d516a992a8757b5
> dashboard link: https://syzkaller.appspot.com/bug?extid=8040d16d30c215f821de
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1360e2f1880000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14a95659880000
>
> Reported-by: syzbot+8040d16d30c215f821de@...kaller.appspotmail.com
> Fixes: e624e6c3e777 ("nfc: Add a virtual nci device driver")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

#syz fix: NFC: nci: Allow to create multiple virtual nci devices