linux-kernel - Re: possible deadlock in console_trylock

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Date:   Tue, 25 Jun 2019 18:52:36 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Petr Mladek <pmladek@...e.com>
Cc:     syzbot <syzbot+fc1da0f1a577d15b64fc@...kaller.appspotmail.com>,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: possible deadlock in console_trylock_spinning

On 2019/06/25 17:55, syzbot wrote:
> syzbot has bisected this bug to:
> 
> commit e80b18599a39a625bc8b2e39ba3004a62f78805a
> Author: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> Date:   Fri Apr 12 11:04:54 2019 +0000
> 
>     tomoyo: Add a kernel config option for fuzzing testing.
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=156e43cea00000
> start commit:   abf02e29 Merge tag 'pm-5.2-rc6' of git://git.kernel.org/pu..
> git tree:       upstream
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=176e43cea00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=136e43cea00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=28ec3437a5394ee0
> dashboard link: https://syzkaller.appspot.com/bug?extid=fc1da0f1a577d15b64fc
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1357add6a00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1611ac89a00000
> 
> Reported-by: syzbot+fc1da0f1a577d15b64fc@...kaller.appspotmail.com
> Fixes: e80b18599a39 ("tomoyo: Add a kernel config option for fuzzing testing.")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> 

This is not a TOMOYO's problem because that commit simply confused inject_fault(4)
by adding memory allocation from TOMOYO's hook. Anyway, this bug should be sent to
printk() people.