------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff888061ed5460 object type: timer_list hint: hci_devcd_timeout+0x0/0x2e0 net/bluetooth/coredump.c:288
WARNING: lib/debugobjects.c:612 at debug_print_object+0x18e/0x2a0 lib/debugobjects.c:612, CPU#1: kworker/1:5/12727
Modules linked in:
CPU: 1 UID: 0 PID: 12727 Comm: kworker/1:5 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
Workqueue: events devcd_del
RIP: 0010:debug_print_object+0x19b/0x2a0 lib/debugobjects.c:612
Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4f 48 8d 3d 42 cb d4 0b 41 56 48 8b 14 dd 60 44 fa 8b 4c 89 e6 <67> 48 0f b9 3a 58 83 05 5c 8d ca 0b 01 48 83 c4 18 5b 5d 41 5c 41
RSP: 0018:ffffc9000ea477e8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffffffff8bfa43a0 RSI: ffffffff8bfa3fc0 RDI: ffffffff90c1cc30
RBP: 0000000000000001 R08: ffff888061ed5460 R09: ffffffff8b92b8a0
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8bfa3fc0
R13: ffffffff8b92b8e0 R14: ffffffff8a804e10 R15: ffffc9000ea478e8
FS:  0000000000000000(0000) GS:ffff8881246e5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe1c8d456b8 CR3: 000000007e3b4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline]
 debug_check_no_obj_freed+0x4da/0x630 lib/debugobjects.c:1129
 free_pages_prepare mm/page_alloc.c:1440 [inline]
 __free_frozen_pages+0x358/0x1130 mm/page_alloc.c:2973
 hci_release_dev+0x4ef/0x630 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+0x1f7/0x640 lib/kobject.c:737
 put_device+0x1f/0x30 drivers/base/core.c:3797
 devcd_dev_release+0x122/0x170 drivers/base/devcoredump.c:90
 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+0x1f7/0x640 lib/kobject.c:737
 put_device+0x1f/0x30 drivers/base/core.c:3797
 __devcd_del drivers/base/devcoredump.c:98 [inline]
 devcd_del+0xaf/0xd0 drivers/base/devcoredump.c:114
 process_one_work+0x9c2/0x1840 kernel/workqueue.c:3257
 process_scheduled_works kernel/workqueue.c:3340 [inline]
 worker_thread+0x5da/0xe40 kernel/workqueue.c:3421
 kthread+0x3b3/0x730 kernel/kthread.c:463
 ret_from_fork+0x754/0xaf0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
----------------
Code disassembly (best guess):
   0:	b8 00 00 00 00       	mov    $0x0,%eax
   5:	00 fc                	add    %bh,%ah
   7:	ff                   	lcall  (bad)
   8:	df 48 89             	fisttps -0x77(%rax)
   b:	fa                   	cli
   c:	48 c1 ea 03          	shr    $0x3,%rdx
  10:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
  14:	75 4f                	jne    0x65
  16:	48 8d 3d 42 cb d4 0b 	lea    0xbd4cb42(%rip),%rdi        # 0xbd4cb5f
  1d:	41 56                	push   %r14
  1f:	48 8b 14 dd 60 44 fa 	mov    -0x7405bba0(,%rbx,8),%rdx
  26:	8b
  27:	4c 89 e6             	mov    %r12,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	58                   	pop    %rax
  30:	83 05 5c 8d ca 0b 01 	addl   $0x1,0xbca8d5c(%rip)        # 0xbca8d93
  37:	48 83 c4 18          	add    $0x18,%rsp
  3b:	5b                   	pop    %rbx
  3c:	5d                   	pop    %rbp
  3d:	41 5c                	pop    %r12
  3f:	41                   	rex.B