linux-kernel - Re: [syzbot] [nfc?] possible deadlock in nci_start

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Message-ID: <CACT4Y+YkCX9kmu24NGPV_fZQ6fK9aWSJQMY1SQ8G80zsU+DqnQ@mail.gmail.com>
Date:   Tue, 11 Apr 2023 09:06:38 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+f1f36887d202cea1446d@...kaller.appspotmail.com>
Cc:     bongsu.jeon@...sung.com, davem@...emloft.net, edumazet@...gle.com,
        hdanton@...a.com, krzysztof.kozlowski@...aro.org, kuba@...nel.org,
        linma@....edu.cn, linux-kernel@...r.kernel.org,
        linux-nfc@...ts.01.org, netdev@...r.kernel.org, pabeni@...hat.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [nfc?] possible deadlock in nci_start_poll

On Sun, 26 Mar 2023 at 01:46, syzbot
<syzbot+f1f36887d202cea1446d@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit b2e44aac91b25abbed57d785089c4b7af926a7bd
> Author: Dmitry Vyukov <dvyukov@...gle.com>
> Date:   Tue Nov 15 10:00:17 2022 +0000
>
>     NFC: nci: Allow to create multiple virtual nci devices
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=117e50c1c80000
> start commit:   0b1dcc2cf55a Merge tag 'mm-hotfixes-stable-2022-11-24' of ..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=436ee340148d5197
> dashboard link: https://syzkaller.appspot.com/bug?extid=f1f36887d202cea1446d
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=125fa5c5880000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12508d3d880000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: NFC: nci: Allow to create multiple virtual nci devices
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Looks reasonable:

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