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

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Date:   Fri, 19 Jun 2020 09:35:30 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Greg KH <greg@...ah.com>, syzkaller <syzkaller@...glegroups.com>
Cc:     syzbot <syzbot+42bc0d31b9a21faebdf8@...kaller.appspotmail.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Borislav Petkov <bp@...en8.de>, devel@...ukata.com,
        "H. Peter Anvin" <hpa@...or.com>,
        LKML <linux-kernel@...r.kernel.org>,
        USB list <linux-usb@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Al Viro <viro@...iv.linux.org.uk>,
        "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: INFO: trying to register non-static key in is_dynamic_key

On Fri, Jun 19, 2020 at 9:07 AM Greg KH <greg@...ah.com> wrote:
>
> On Thu, Jun 18, 2020 at 02:17:15PM -0700, syzbot wrote:
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit:    b791d1bd Merge tag 'locking-kcsan-2020-06-11' of git://git..
> > git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
> > console output: https://syzkaller.appspot.com/x/log.txt?x=13f305a9100000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=16c2467d4b6dbee2
> > dashboard link: https://syzkaller.appspot.com/bug?extid=42bc0d31b9a21faebdf8
> > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=136ad566100000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10138f7a100000
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+42bc0d31b9a21faebdf8@...kaller.appspotmail.com
> >
> > INFO: trying to register non-static key.
> > the code is fine but needs lockdep annotation.
>
> Why is INFO: triggering syzbot?

This is a kernel bug, no?

And there are lots of other kernel bug types that start with INFO:
https://github.com/google/syzkaller/blob/master/pkg/report/linux.go#L1302

The rules to understand when linux kernel has bugged are insanely
complex in syzkaller:
https://github.com/google/syzkaller/blob/master/pkg/report/linux.go#L914-L1685
(+hundreds of hardcoded function names and file names above).