------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff8880640b9248 object type: timer_list hint: hci_devcd_timeout+0x0/0x2e0 net/bluetooth/coredump.c:232
WARNING: CPU: 0 PID: 16013 at lib/debugobjects.c:612 debug_print_object+0x1a2/0x2b0 lib/debugobjects.c:612
Modules linked in:
CPU: 0 UID: 0 PID: 16013 Comm: syz.3.2341 Tainted: G     U              6.15.0-rc1-syzkaller-00325-g7cdabafc0012 #0 PREEMPT(full) 
Tainted: [U]=USER
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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 60 60 f4 8b 4c 89 e6 48 c7 c7 e0 54 f4 8b e8 1f 16 a8 fc 90 <0f> 0b 90 90 58 83 05 56 f6 b3 0b 01 48 83 c4 18 5b 5d 41 5c 41 5d
RSP: 0018:ffffc9000d3ef798 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffffff817acff8
RDX: ffff88807c18bc00 RSI: ffffffff817ad005 RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffffffff8bf45b80
R13: ffffffff8b8fc8c0 R14: ffffffff8a7833d0 R15: ffffc9000d3ef898
FS:  0000000000000000(0000) GS:ffff8881249b9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd3168bf6d CR3: 000000007a298000 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:2320 [inline]
 slab_free mm/slub.c:4646 [inline]
 kfree+0x291/0x4d0 mm/slub.c:4845
 hci_release_dev+0x4d8/0x600 net/bluetooth/hci_core.c:2739
 bt_host_release+0x6a/0xb0 net/bluetooth/hci_sysfs.c:87
 device_release+0xa1/0x240 drivers/base/core.c:2568
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1e4/0x5a0 lib/kobject.c:737
 put_device+0x1f/0x30 drivers/base/core.c:3774
 vhci_release+0x81/0xf0 drivers/bluetooth/hci_vhci.c:666
 __fput+0x3ff/0xb70 fs/file_table.c:465
 task_work_run+0x14d/0x240 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0xafb/0x2c30 kernel/exit.c:953
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
 get_signal+0x2673/0x26d0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 irqentry_exit_to_user_mode+0x13f/0x280 kernel/entry/common.c:231
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f9a6178d171
Code: Unable to access opcode bytes at 0x7f9a6178d147.
RSP: 002b:fffffffffffffff8 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f9a619a5fa0 RCX: 00007f9a6178d169
RDX: 0000200000000180 RSI: fffffffffffffff8 RDI: 0000000000000005
RBP: 00007f9a6180e990 R08: 0000000000000001 R09: 0000000000000000
R10: 00002000000001c0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f9a619a5fa0 R15: 00007ffff7d0d588
 </TASK>