linux-kernel - Re: [syzbot] [net?] general protection fault in qdisc_tree_reduce

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Message-ID: <686791fb.a70a0220.29cf51.0014.GAE@google.com>
Date: Fri, 04 Jul 2025 01:34:03 -0700
From: syzbot <syzbot+1261670bbdefc5485a06@...kaller.appspotmail.com>
To: davem@...emloft.net, edumazet@...gle.com, hdanton@...a.com, 
	horms@...nel.org, jhs@...atatu.com, jiri@...nulli.us, kuba@...nel.org, 
	linux-kernel@...r.kernel.org, lizhi.xu@...driver.com, netdev@...r.kernel.org, 
	nnamrec@...il.com, pabeni@...hat.com, syzkaller-bugs@...glegroups.com, 
	xiyou.wangcong@...il.com
Subject: Re: [syzbot] [net?] general protection fault in qdisc_tree_reduce_backlog

syzbot has bisected this issue to:

commit 103406b38c600fec1fe375a77b27d87e314aea09
Author: Lion Ackermann <nnamrec@...il.com>
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@...kaller.appspotmail.com
Fixes: 103406b38c60 ("net/sched: Always pass notifications when child class becomes empty")

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