------------[ cut here ]------------
sysfs group 'power' not found for kobject 'bt1'
WARNING: CPU: 1 PID: 10372 at fs/sysfs/group.c:284 sysfs_remove_group+0x17b/0x290 fs/sysfs/group.c:282
Modules linked in:
CPU: 1 PID: 10372 Comm: kworker/1:1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Workqueue: events delete_netdev
RIP: 0010:sysfs_remove_group+0x17b/0x290 fs/sysfs/group.c:282
Code: 8b 1b 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 f7 fd c8 ff 49 8b 17 48 c7 c7 40 d2 fa 8a 48 89 de e8 95 a6 39 ff <0f> 0b 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 5f f8 6f ff
RSP: 0018:ffffc9000cbd77e0 EFLAGS: 00010246
RAX: 8b5b1d79bd209900 RBX: ffffffff8b6192e0 RCX: ffff888023889e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc9000cbd7910 R08: ffffc9000cbd73e7 R09: 1ffff9200197ae7c
R10: dffffc0000000000 R11: fffff5200197ae7d R12: 1ffffffff16c3260
R13: dffffc0000000000 R14: ffff88805daa63e0 R15: ffff888033a786f0
FS:  0000000000000000(0000) GS:ffff8880b8d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2a0675da08 CR3: 00000000699d8000 CR4: 00000000003526e0
Call Trace:
 <TASK>
 device_del+0x251/0x910 drivers/base/core.c:3932
 unregister_netdevice_many_notify+0x1449/0x1910 net/core/dev.c:11255
 unregister_netdevice_many net/core/dev.c:11281 [inline]
 unregister_netdevice_queue+0x2e9/0x330 net/core/dev.c:11161
 unregister_netdevice include/linux/netdevice.h:3198 [inline]
 lowpan_unregister_netdevice net/6lowpan/core.c:66 [inline]
 lowpan_unregister_netdev+0x1c/0x30 net/6lowpan/core.c:74
 unregister_dev+0x70/0x1a0 net/bluetooth/6lowpan.c:763
 process_one_work kernel/workqueue.c:2657 [inline]
 process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>