linux-kernel - Re: WARNING: locking bug in tomoyo

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Date:   Thu, 23 Apr 2020 10:50:08 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     syzbot <syzbot+1c36440b364ea3774701@...kaller.appspotmail.com>,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        Network Development <netdev@...r.kernel.org>,
        James Chapman <jchapman@...alix.com>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: WARNING: locking bug in tomoyo_supervisor

On (20/04/17 13:37), Tetsuo Handa wrote:
> On 2020/04/17 7:05, syzbot wrote:
> > Hello,
> > 
> > syzbot found the following crash on:
> > 
> > HEAD commit:    4f8a3cc1 Merge tag 'x86-urgent-2020-04-12' of git://git.ke..
> > git tree:       upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=1599027de00000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=3bfbde87e8e65624
> > dashboard link: https://syzkaller.appspot.com/bug?extid=1c36440b364ea3774701
> > compiler:       clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=150733cde00000
> 
> This seems to be a misattributed report explained at https://lkml.kernel.org/r/20190924140241.be77u2jne3melzte@pathway.suse.cz .
> Petr and Sergey, how is the progress of making printk() asynchronous? When can we expect that work to be merged?

I'd say that lockless logbuf probably will land sometime around 5.8+.
Async printk() - unknown.

	-ss