Re: [syzbot] [net?] WARNING in dev_shutdown (7)

[syzbot <syzbot+c9ecf60a8adb7629821e@syzkaller.appspotmail.com>]

syzbot has found a reproducer for the following issue on:

HEAD commit:    d358e5254674 Merge tag 'for-6.19/dm-changes' of git://git...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1708661a580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=73d2ed7b46aaccf3
dashboard link: https://syzkaller.appspot.com/bug?extid=c9ecf60a8adb7629821e
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12085592580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/1d59faedb36d/disk-d358e525.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1d120390f17c/vmlinux-d358e525.xz
kernel image: https://storage.googleapis.com/syzbot-assets/142411a13cfd/bzImage-d358e525.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c9ecf60a8adb7629821e@syzkaller.appspotmail.com

usb 4-1: USB disconnect, device number 6
net1080 4-1:0.166 usb0: unregister 'net1080' usb-dummy_hcd.3-1, NetChip TurboCONNECT
------------[ cut here ]------------
WARNING: net/sched/sch_generic.c:1496 at dev_shutdown+0x3c1/0x430 net/sched/sch_generic.c:1496, CPU#1: kworker/1:7/6098
Modules linked in:
CPU: 1 UID: 0 PID: 6098 Comm: kworker/1:7 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:dev_shutdown+0x3c1/0x430 net/sched/sch_generic.c:1496
Code: 48 c7 c2 40 2d c7 8c be a3 00 00 00 48 c7 c7 40 32 c7 8c c6 05 1f 30 08 07 01 e8 aa cd 30 f8 e9 8f fd ff ff e8 70 1b 56 f8 90 <0f> 0b 90 e9 5f fe ff ff 4c 89 f7 e8 ef e8 bf f8 e9 6c fc ff ff 4c
RSP: 0018:ffffc90003f5f410 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802c5444d0 RCX: ffffffff89683b9e
RDX: ffff88807a4b4980 RSI: ffffffff8968c850 RDI: ffff88802c5445b0
RBP: ffff88802c544000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88802c544480
R13: ffffed10058a8803 R14: ffff88802c5444c8 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8881249fd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000040 CR3: 0000000029904000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 unregister_netdevice_many_notify+0xb37/0x2590 net/core/dev.c:12369
 unregister_netdevice_many net/core/dev.c:12444 [inline]
 unregister_netdevice_queue net/core/dev.c:12258 [inline]
 unregister_netdevice_queue+0x305/0x3c0 net/core/dev.c:12248
 unregister_netdevice include/linux/netdevice.h:3405 [inline]
 unregister_netdev+0x1f/0x60 net/core/dev.c:12462
 usbnet_disconnect+0x109/0x510 drivers/net/usb/usbnet.c:1676
 usb_unbind_interface+0x1dd/0x9e0 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:571 [inline]
 device_remove+0x125/0x170 drivers/base/dd.c:563
 __device_release_driver drivers/base/dd.c:1282 [inline]
 device_release_driver_internal+0x44b/0x620 drivers/base/dd.c:1305
 bus_remove_device+0x22f/0x450 drivers/base/bus.c:616
 device_del+0x396/0x9f0 drivers/base/core.c:3878
 usb_disable_device+0x355/0x820 drivers/usb/core/message.c:1418
 usb_disconnect+0x2e1/0x9e0 drivers/usb/core/hub.c:2345
 hub_port_connect drivers/usb/core/hub.c:5407 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
 port_event drivers/usb/core/hub.c:5871 [inline]
 hub_event+0x1d84/0x52f0 drivers/usb/core/hub.c:5953
 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
 process_scheduled_works kernel/workqueue.c:3340 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.