------------[ cut here ]------------
sysfs group 'power' not found for kobject 'bt0'
WARNING: CPU: 0 PID: 126 at fs/sysfs/group.c:280 sysfs_remove_group+0x177/0x290 fs/sysfs/group.c:278
Modules linked in:
CPU: 0 PID: 126 Comm: kworker/0:2 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: events delete_netdev
RIP: 0010:sysfs_remove_group+0x177/0x290 fs/sysfs/group.c:278
Code: 8b 1b 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 eb 2b cb ff 49 8b 17 48 c7 c7 a0 70 9c 8a 48 89 de e8 f9 6d 45 ff <0f> 0b 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 03 e7 79 ff
RSP: 0018:ffffc90002d97880 EFLAGS: 00010246
RAX: ce660e6e528a7500 RBX: ffffffff8b03c240 RCX: ffff88801ab69e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc90002d979b0 R08: ffffc90002d97507 R09: 1ffff920005b2ea0
R10: dffffc0000000000 R11: fffff520005b2ea1 R12: 1ffffffff160784c
R13: dffffc0000000000 R14: ffff888077af52b8 R15: ffff8880792b0688
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000bd038 CR3: 0000000077ba9000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000009951
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 device_del+0x2ab/0xa80 drivers/base/core.c:3877
 unregister_netdevice_many_notify+0x14b6/0x1990 net/core/dev.c:11051
 unregister_netdevice_many net/core/dev.c:11077 [inline]
 unregister_netdevice_queue+0x2e5/0x330 net/core/dev.c:10960
 unregister_netdevice include/linux/netdevice.h:3077 [inline]
 lowpan_unregister_netdevice net/6lowpan/core.c:66 [inline]
 lowpan_unregister_netdev+0x18/0x20 net/6lowpan/core.c:74
 unregister_dev+0x70/0x1a0 net/bluetooth/6lowpan.c:763
 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>