netdev - Re: [syzbot] kernel BUG in pskb_expand

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Date:   Sun, 19 Dec 2021 20:15:07 -0800
From:   syzbot <syzbot+4c63f36709a642f801c5@...kaller.appspotmail.com>
To:     anthony.l.nguyen@...el.com, changbin.du@...el.com,
        christian.brauner@...ntu.com, davem@...emloft.net,
        edumazet@...gle.com, eric.dumazet@...il.com, hawk@...nel.org,
        hkallweit1@...il.com, intel-wired-lan-owner@...osl.org,
        intel-wired-lan@...ts.osuosl.org, jesse.brandeburg@...el.com,
        kuba@...nel.org, linux-can@...r.kernel.org,
        linux-kernel@...r.kernel.org, mkl@...gutronix.de,
        netdev@...r.kernel.org, socketcan@...tkopp.net,
        syzkaller-bugs@...glegroups.com, yajun.deng@...ux.dev
Subject: Re: [syzbot] kernel BUG in pskb_expand_head

syzbot has bisected this issue to:

commit e4b8954074f6d0db01c8c97d338a67f9389c042f
Author: Eric Dumazet <edumazet@...gle.com>
Date:   Tue Dec 7 01:30:37 2021 +0000

    netlink: add net device refcount tracker to struct ethnl_req_info

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=109e6fcbb00000
start commit:   434ed2138994 Merge branch 'tc-action-offload'
git tree:       net-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=129e6fcbb00000
console output: https://syzkaller.appspot.com/x/log.txt?x=149e6fcbb00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7488eea316146357
dashboard link: https://syzkaller.appspot.com/bug?extid=4c63f36709a642f801c5
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14141ca3b00000

Reported-by: syzbot+4c63f36709a642f801c5@...kaller.appspotmail.com
Fixes: e4b8954074f6 ("netlink: add net device refcount tracker to struct ethnl_req_info")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection