linux-kernel - Re: INFO: trying to register non-static key in io_cqring_overflow

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Date:   Thu, 28 Nov 2019 16:29:03 +0100
From:   Jann Horn <jannh@...gle.com>
To:     Jens Axboe <axboe@...nel.dk>,
        syzbot <syzbot+be9e13497969768c0e6e@...kaller.appspotmail.com>
Cc:     io-uring <io-uring@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: INFO: trying to register non-static key in io_cqring_overflow_flush

On Thu, Nov 28, 2019 at 4:19 PM Jens Axboe <axboe@...nel.dk> wrote:
> On 11/28/19 12:35 AM, syzbot wrote:
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit:    d7688697 Merge tag 'for-linus' of git://git.kernel.org/pub..
> > git tree:       upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=145e5fcee00000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=12f2051e3d8cdb3f
> > dashboard link: https://syzkaller.appspot.com/bug?extid=be9e13497969768c0e6e
> > compiler:       clang version 9.0.0 (/home/glider/llvm/clang
> > 80fee25776c2fb61e74c1ecb1a523375c2500b69)
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=146c517ae00000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16550b12e00000
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+be9e13497969768c0e6e@...kaller.appspotmail.com
>
> This is the same as:
>
> syzbot+0d818c0d39399188f393@...kaller.appspotmail.com

syzbot listens to specific commands, see
<https://github.com/google/syzkaller/blob/master/docs/syzbot.md#status>
(linked in the report):

#syz dup: INFO: trying to register non-static key in io_cqring_ev_posted