Re: [syzbot] [usb?] kernel BUG in register_netdevice

[Aleksandr Nogikh]

On Thu, Aug 20, 2026 at 9:08 AM Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
>
> On Wed, Aug 19, 2026 at 11:59:05PM -0700, syzbot wrote:
> > syzbot has bisected this issue to:
> >
> > commit 425b9c7f51c98443db71ad679893725483b21196
> > Author: Vasily Averin <vvs@xxxxxxxxxx>
> > Date:   Mon May 2 12:15:51 2022 +0000
> >
> >     memcg: accounting for objects allocated for new netdevice
> >
> > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1212ba25580000
> > start commit:   e8bf40d15402 Merge tag 'chrome-platform-firmware-v7.3' of ..
> > git tree:       upstream
> > final oops:     https://syzkaller.appspot.com/x/report.txt?x=1112ba25580000
> > console output: https://syzkaller.appspot.com/x/log.txt?x=1612ba25580000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=46f568dd8d795f6
> > dashboard link: https://syzkaller.appspot.com/bug?extid=85ede281798faf736677
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=156b2549580000
> >
> > Reported-by: syzbot+85ede281798faf736677@xxxxxxxxxxxxxxxxxxxxxxxxx
> > Fixes: 425b9c7f51c9 ("memcg: accounting for objects allocated for new netdevice")
> >
> > For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> >
>
> I strongly doubt this bisection.
>
> Note, syzbot has gone on a tear lately with USB "issues", what happened
> to suddenly cause this?  Did some new functionality get added to it such
> that it is wanting to stress-test the bind/unbind racing with gadget
> device setup suddenly?  What changed to start all of these reports?

It's a consequence of using LLMs to generate seed programs:
https://lpc.events/event/20/contributions/2619/

We did not specifically aim at gadget drivers, etc.; they just
happened to be one of the areas where injecting extra seed programs
into syzbot led to a lot of new code coverage and thus many newly
observed kernel crashes.

-- 
Aleksandr


>
> thanks,
>
> greg k-h
>
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