ODEBUG: assert_init not available (active state 0) object type: timer_list hint:           (null)
------------[ cut here ]------------
WARNING: CPU: 0 PID: 30471 at lib/debugobjects.c:287 debug_print_object.cold+0xa7/0xdb lib/debugobjects.c:287
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 30471 Comm: syz-executor.2 Not tainted 4.14.232-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x20/0x44 kernel/panic.c:547
 report_bug+0x208/0x250 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:debug_print_object.cold+0xa7/0xdb lib/debugobjects.c:287
RSP: 0018:ffff888040fcfa30 EFLAGS: 00010082
RAX: 0000000000000061 RBX: 0000000000000005 RCX: 0000000000000000
RDX: 0000000000011426 RSI: ffffffff81441a30 RDI: ffffed10081f9f3c
RBP: ffffffff878b6e80 R08: 0000000000000061 R09: 0000000000000002
R10: 0000000000000000 R11: ffff888097586100 R12: 0000000000000000
R13: 0000000000000000 R14: ffff8880af3b8570 R15: 1ffff110081f9f4f
 debug_object_assert_init lib/debugobjects.c:656 [inline]
 debug_object_assert_init+0x1d3/0x2d0 lib/debugobjects.c:627
 debug_timer_assert_init kernel/time/timer.c:708 [inline]
 debug_assert_init kernel/time/timer.c:756 [inline]
 del_timer+0x5d/0xe0 kernel/time/timer.c:1151
 try_to_grab_pending+0x243/0x610 kernel/workqueue.c:1225
 __cancel_work+0x68/0x240 kernel/workqueue.c:3032
 l2cap_clear_timer include/net/bluetooth/l2cap.h:834 [inline]
 l2cap_chan_del+0x4b5/0x950 net/bluetooth/l2cap_core.c:641
 l2cap_chan_close+0x103/0x870 net/bluetooth/l2cap_core.c:757
 l2cap_sock_shutdown+0x2e7/0xc20 net/bluetooth/l2cap_sock.c:1160
 SYSC_shutdown net/socket.c:1917 [inline]
 SyS_shutdown+0xd1/0x160 net/socket.c:1908
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x4665d9
RSP: 002b:00007fb322d6a188 EFLAGS: 00000246 ORIG_RAX: 0000000000000030
RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 00000000004665d9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000004
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008
R13: 00007ffc8c13b57f R14: 00007fb322d6a300 R15: 0000000000022000
Kernel Offset: disabled
Rebooting in 86400 seconds..