------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff888034231360 object type: timer_list hint: hci_devcd_timeout+0x0/0x2e0 net/bluetooth/coredump.c:232
WARNING: CPU: 1 PID: 1217 at lib/debugobjects.c:612 debug_print_object+0x1a2/0x2b0 lib/debugobjects.c:612
Modules linked in:
CPU: 1 UID: 0 PID: 1217 Comm: kworker/1:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: events devcd_del
RIP: 0010:debug_print_object+0x1a2/0x2b0 lib/debugobjects.c:612
Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 54 41 56 48 8b 14 dd e0 3d 16 8c 4c 89 e6 48 c7 c7 60 32 16 8c e8 ff 07 92 fc 90 <0f> 0b 90 90 58 83 05 06 ba c3 0b 01 48 83 c4 18 5b 5d 41 5c 41 5d
RSP: 0018:ffffc90003f2f8a8 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffffff817a02c8
RDX: ffff888028388000 RSI: ffffffff817a02d5 RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffffffff8c163900
R13: ffffffff8bafeb80 R14: ffffffff8a9a7cf0 R15: ffffc90003f2f9a8
FS:  0000000000000000(0000) GS:ffff8881247c3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3ac78e56c0 CR3: 000000007c5f2000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline]
 debug_check_no_obj_freed+0x4b7/0x600 lib/debugobjects.c:1129
 slab_free_hook mm/slub.c:2348 [inline]
 slab_free mm/slub.c:4680 [inline]
 kfree+0x28f/0x4d0 mm/slub.c:4879
 hci_release_dev+0x4ef/0x610 net/bluetooth/hci_core.c:2776
 bt_host_release+0x6a/0xb0 net/bluetooth/hci_sysfs.c:87
 device_release+0xa4/0x240 drivers/base/core.c:2565
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1e7/0x5a0 lib/kobject.c:737
 put_device+0x1f/0x30 drivers/base/core.c:3797
 devcd_dev_release+0x122/0x170 drivers/base/devcoredump.c:94
 device_release+0xa4/0x240 drivers/base/core.c:2565
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1e7/0x5a0 lib/kobject.c:737
 put_device+0x1f/0x30 drivers/base/core.c:3797
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>