Re: WARNING in kernfs_get

Greg KH
2019-11-20T08:30:05Z

On Wed, Nov 20, 2019 at 12:17:01AM -0800, syzbot wrote:
> syzbot has bisected this bug to:
>
> commit 726e41097920a73e4c7c33385dcc0debb1281e18
> Author: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Date: Tue Jul 10 00:29:10 2018 +0000
>
> drivers: core: Remove glue dirs from sysfs earlier
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17a101cee00000
> start commit: 9a568276 Merge branch 'x86-urgent-for-linus' of git://git...
> git tree: upstream
> final crash: https://syzkaller.appspot.com/x/report.txt?x=146101cee00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=106101cee00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=8f59875069d721b6
> dashboard link: https://syzkaller.appspot.com/bug?extid=3dcb532381f98c86aeb1
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12657f0a400000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=117728ae400000
>
> Reported-by: syzbot+3dcb532381f98c86aeb1@syzkaller.appspotmail.com
> Fixes: 726e41097920 ("drivers: core: Remove glue dirs from sysfs earlier")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Again, I think this should be resolved with ac43432cb1f5 ("driver core:
Fix use-after-free and double free on glue directory")

Is there any way to run the reproducer on a newer tree?

thanks,

greg k-h