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SubjectRe: [syzbot] kernel BUG in pskb_expand_head
On 05.01.2022 05:59:35, Eric Dumazet wrote:
> On Wed, Jan 5, 2022 at 3:20 AM syzbot
> <syzbot+4c63f36709a642f801c5@syzkaller.appspotmail.com> wrote:
> >
> > syzbot has found a reproducer for the following issue on:
> >
> > HEAD commit: c9e6606c7fe9 Linux 5.16-rc8
> > git tree: upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=148351c3b00000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=32f9fa260d7413b4
> > dashboard link: https://syzkaller.appspot.com/bug?extid=4c63f36709a642f801c5
> > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15435e2bb00000
> > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12f4508db00000
> >
>
> This C repro looks legit, bug should be in CAN layer.

ACK - it's bug in CAN's ISOTP

> > The issue was bisected to:
> >
> > commit e4b8954074f6d0db01c8c97d338a67f9389c042f
> > Author: Eric Dumazet <edumazet@google.com>
> > Date: Tue Dec 7 01:30:37 2021 +0000
> >
> > netlink: add net device refcount tracker to struct ethnl_req_info
>
> Ignore this bisection, an unrelated commit whent in its way.

ACK - We have a RFC fix for this:

https://lore.kernel.org/all/20220105132429.1170627-1-mkl@pengutronix.de

regards,
Marc

--
Pengutronix e.K. | Marc Kleine-Budde |
Embedded Linux | https://www.pengutronix.de |
Vertretung West/Dortmund | Phone: +49-231-2826-924 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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