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

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Message-ID: <CACT4Y+Yf4ckOJjGkkFh_HYEKDjQo34wN=q18ADbP3=vhd5eQJQ@mail.gmail.com>
Date:   Mon, 27 Jun 2022 09:11:58 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+0b7c8bfd17c00d016fb4@...kaller.appspotmail.com>
Cc:     akpm@...ux-foundation.org, elver@...gle.com, glider@...gle.com,
        gregkh@...uxfoundation.org, jirislaby@...nel.org,
        john.ogness@...utronix.de, linux-kernel@...r.kernel.org,
        npiggin@...il.com, pmladek@...e.com, rdunlap@...radead.org,
        rostedt@...dmis.org, senozhatsky@...omium.org, swboyd@...omium.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] possible deadlock in console_unlock (2)

On Sun, 26 Jun 2022 at 10:04, syzbot
<syzbot+0b7c8bfd17c00d016fb4@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit faebd693c59387b7b765fab64b543855e15a91b4
> Author: John Ogness <john.ogness@...utronix.de>
> Date:   Thu Apr 21 21:22:36 2022 +0000
>
>     printk: rename cpulock functions
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=17ed359bf00000
> start commit:   aa051d36ce4a Merge tag 'for-linus-2022052401' of git://git..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=6c31e1555a4c59f3
> dashboard link: https://syzkaller.appspot.com/bug?extid=0b7c8bfd17c00d016fb4
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16a5aad6f00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16d697c3f00000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: printk: rename cpulock functions
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection


I guess this is also:

#syz fix: printk: add kthread console printers

as "possible deadlock in console_lock_spinning_enable":
https://syzkaller.appspot.com/bug?id=7f31f600c4a83b33f7a5b71a364f971dcd177db4

But interestingly syzbot consistently points at the "rename cpulock
functions" commit...