------------[ cut here ]------------
workqueue: cannot queue hci_conn_timeout on wq hci4
WARNING: kernel/workqueue.c:2306 at __queue_work+0xd91/0x10f0 kernel/workqueue.c:2305, CPU#1: kworker/1:0/31
Modules linked in:
CPU: 1 UID: 0 PID: 31 Comm: kworker/1:0 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue: events l2cap_chan_timeout
RIP: 0010:__queue_work+0xdae/0x10f0 kernel/workqueue.c:2305
Code: 81 c3 68 01 00 00 4c 8d 35 af c8 24 0e 48 89 f8 48 c1 e8 03 42 80 3c 20 00 74 05 e8 7c 6f a1 00 49 8b 77 18 4c 89 f7 48 89 da <67> 48 0f b9 3a 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ff
RSP: 0018:ffffc90000a5f8b8 EFLAGS: 00010046
RAX: 1ffff110074ae95b RBX: ffff888038732168 RCX: ffff88801d2e8000
RDX: ffff888038732168 RSI: ffffffff8a378cd0 RDI: ffffffff8fb29270
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed10074ae959 R12: dffffc0000000000
R13: ffff888038732000 R14: ffffffff8fb29270 R15: ffff88803a574ac0
FS:  0000000000000000(0000) GS:ffff888125d42000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd44aa4e08 CR3: 000000003785a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 queue_delayed_work_on+0x11a/0x1e0 kernel/workqueue.c:2620
 l2cap_chan_del+0x286/0x600 net/bluetooth/l2cap_core.c:701
 l2cap_chan_close+0x4d7/0x770 net/bluetooth/l2cap_core.c:-1
 l2cap_chan_timeout+0x21e/0x470 net/bluetooth/l2cap_core.c:433
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess):
   0:	81 c3 68 01 00 00    	add    $0x168,%ebx
   6:	4c 8d 35 af c8 24 0e 	lea    0xe24c8af(%rip),%r14        # 0xe24c8bc
   d:	48 89 f8             	mov    %rdi,%rax
  10:	48 c1 e8 03          	shr    $0x3,%rax
  14:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
  19:	74 05                	je     0x20
  1b:	e8 7c 6f a1 00       	call   0xa16f9c
  20:	49 8b 77 18          	mov    0x18(%r15),%rsi
  24:	4c 89 f7             	mov    %r14,%rdi
  27:	48 89 da             	mov    %rbx,%rdx
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	4c 89 f8             	mov    %r15,%rax
  32:	48 c1 e8 03          	shr    $0x3,%rax
  36:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
  3b:	74 08                	je     0x45
  3d:	4c 89 ff             	mov    %r15,%rdi