linux-kernel - Re: WARNING in kernfs

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Date:   Wed, 20 Nov 2019 09:29:58 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     syzbot <syzbot+3dcb532381f98c86aeb1@...kaller.appspotmail.com>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        linux-kernel@...r.kernel.org, penguin-kernel@...ove.sakura.ne.jp,
        rafael@...nel.org, syzkaller-bugs@...glegroups.com, tj@...nel.org,
        torvalds@...ux-foundation.org
Subject: Re: WARNING in kernfs_get

On Wed, Nov 20, 2019 at 12:17:01AM -0800, syzbot wrote:
> syzbot has bisected this bug to:
> 
> commit 726e41097920a73e4c7c33385dcc0debb1281e18
> Author: Benjamin Herrenschmidt <benh@...nel.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@...kaller.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