------------[ cut here ]------------
workqueue: cannot queue hci_cmd_timeout on wq hci2
WARNING: kernel/workqueue.c:2353 at __queue_work+0xd83/0x10d0 kernel/workqueue.c:2352, CPU#1: syz.1.15260/25576
Modules linked in:
CPU: 1 UID: 0 PID: 25576 Comm: syz.1.15260 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__queue_work+0xd9f/0x10d0 kernel/workqueue.c:2352
Code: 49 81 c7 70 01 00 00 4c 8d 35 8d f5 ee 0e 48 89 f8 48 c1 e8 03 80 3c 18 00 74 05 e8 cb 98 a9 00 49 8b 75 18 4c 89 f7 4c 89 fa <67> 48 0f b9 3a 4c 89 e8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ef e8
RSP: 0018:ffffc90000a18bc0 EFLAGS: 00010046
RAX: 1ffff1100c7a814e RBX: dffffc0000000000 RCX: ffff888038cb1f40
RDX: ffff88807e41b170 RSI: ffffffff8ad74320 RDI: ffffffff907d3d10
RBP: 0000000000010000 R08: 0000000000000100 R09: 1ffffffff20f4cef
R10: dffffc0000000000 R11: ffffffff818e4ea0 R12: 0000000000000008
R13: ffff888063d40a58 R14: ffffffff907d3d10 R15: ffff88807e41b170
FS:  000055556d820500(0000) GS:ffff888124dc6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff2f85eb840 CR3: 000000007ba36000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 call_timer_fn+0x18d/0x5f0 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1794 [inline]
 __run_timers kernel/time/timer.c:2374 [inline]
 __run_timer_base+0x67e/0x8b0 kernel/time/timer.c:2386
 run_timer_base kernel/time/timer.c:2395 [inline]
 run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405
 handle_softirqs+0x226/0x860 kernel/softirq.c:645
 __do_softirq kernel/softirq.c:679 [inline]
 invoke_softirq kernel/softirq.c:519 [inline]
 __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lockdep_unregister_key+0x2d4/0x350 kernel/locking/lockdep.c:6712
Code: e9 a1 14 09 00 48 c7 c7 90 d9 9b 96 89 c6 e8 53 58 46 0a e9 66 fe ff ff e8 a9 86 43 0a 41 f7 c7 00 02 00 00 74 b4 fb 40 84 ed <75> b3 eb c4 90 0f 0b 90 e9 27 ff ff ff 90 0f 0b 90 e9 2f ff ff ff
RSP: 0018:ffffc900077b7960 EFLAGS: 00000246
RAX: 0000000000000046 RBX: ffff888053ec8268 RCX: 0000000000000046
RDX: ffffffff945754f8 RSI: ffffffff8e432248 RDI: ffffffff8c6dac80
RBP: ffff888038cb1f00 R08: ffffffff81b0d2c8 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff20f4cf0 R12: 0000000000000000
R13: ffff888053ec8269 R14: 0000000000001000 R15: 0000000000000a07
 qdisc_lock_uninit include/net/pkt_sched.h:333 [inline]
 __qdisc_destroy+0x1ab/0x470 net/sched/sch_generic.c:1124
 netdev_for_each_tx_queue include/linux/netdevice.h:2747 [inline]
 dev_shutdown+0x92/0x450 net/sched/sch_generic.c:1512
 unregister_netdevice_many_notify+0x11f4/0x2140 net/core/dev.c:12516
 unregister_netdevice_many net/core/dev.c:12600 [inline]
 unregister_netdevice_queue+0x2f5/0x340 net/core/dev.c:12401
 unregister_netdevice include/linux/netdevice.h:3485 [inline]
 __tun_detach+0x1074/0x1900 drivers/net/tun.c:637
 tun_detach drivers/net/tun.c:653 [inline]
 tun_chr_close+0x10a/0x1c0 drivers/net/tun.c:3587
 __fput+0x418/0xa50 fs/file_table.c:512
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
 exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0beb59e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc9488d358 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f0beb827da0 RCX: 00007f0beb59e159
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f0beb827da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f0beb827cb0 R11: 0000000000000246 R12: 00000000001d31f8
R13: 00007f0beb82627c R14: 00000000001d2ff5 R15: 00007ffc9488d460
 </TASK>
----------------
Code disassembly (best guess):
   0:	49 81 c7 70 01 00 00 	add    $0x170,%r15
   7:	4c 8d 35 8d f5 ee 0e 	lea    0xeeef58d(%rip),%r14        # 0xeeef59b
   e:	48 89 f8             	mov    %rdi,%rax
  11:	48 c1 e8 03          	shr    $0x3,%rax
  15:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1)
  19:	74 05                	je     0x20
  1b:	e8 cb 98 a9 00       	call   0xa998eb
  20:	49 8b 75 18          	mov    0x18(%r13),%rsi
  24:	4c 89 f7             	mov    %r14,%rdi
  27:	4c 89 fa             	mov    %r15,%rdx
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	4c 89 e8             	mov    %r13,%rax
  32:	48 c1 e8 03          	shr    $0x3,%rax
  36:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1)
  3a:	74 08                	je     0x44
  3c:	4c 89 ef             	mov    %r13,%rdi
  3f:	e8                   	.byte 0xe8