Re: [syzbot] [net?] general protection fault in qdisc_tree_reduce_backlog

[syzbot]

syzbot has bisected this issue to:

commit 103406b38c600fec1fe375a77b27d87e314aea09
Author: Lion Ackermann <nnamrec@xxxxxxxxx>
Date:   Mon Jun 30 13:27:30 2025 +0000

    net/sched: Always pass notifications when child class becomes empty

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13678582580000
start commit:   bd475eeaaf3c Merge branch '200GbE' of git://git.kernel.org..
git tree:       net
final oops:     https://syzkaller.appspot.com/x/report.txt?x=10e78582580000
console output: https://syzkaller.appspot.com/x/log.txt?x=17678582580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=36b0e72cad5298f8
dashboard link: https://syzkaller.appspot.com/bug?extid=1261670bbdefc5485a06
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=164d8c8c580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14839ebc580000

Reported-by: syzbot+1261670bbdefc5485a06@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 103406b38c60 ("net/sched: Always pass notifications when child class becomes empty")

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