------------[ cut here ]------------
workqueue: cannot queue hci_cmd_timeout on wq hci2
WARNING: CPU: 0 PID: 17600 at kernel/workqueue.c:2255 __queue_work+0xd03/0x1160 kernel/workqueue.c:2254
Modules linked in:
CPU: 0 UID: 0 PID: 17600 Comm: kworker/u8:14 Not tainted 6.16.0-syzkaller-11699-g7e161a991ea7 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: netns cleanup_net
RIP: 0010:__queue_work+0xd03/0x1160 kernel/workqueue.c:2254
Code: 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 4b 04 00 00 48 8b 75 18 4c 89 fa 48 c7 c7 a0 00 ac 8b e8 1e 1e f7 ff 90 <0f> 0b 90 90 e9 2f f7 ff ff e8 af 7f 38 00 90 0f 0b 90 e9 b4 f5 ff
RSP: 0018:ffffc90000007be8 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817a3308
RDX: ffff888030bea440 RSI: ffffffff817a3315 RDI: 0000000000000001
RBP: ffff88802b858970 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 000000000014ea80 R12: 1ffff92000000f8f
R13: 0000000000000101 R14: ffffffff818324b0 R15: ffff888056174978
FS:  0000000000000000(0000) GS:ffff8881246c6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f01f2cb2d40 CR3: 000000006aceb000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 00000000000032e7 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 call_timer_fn+0x197/0x620 kernel/time/timer.c:1747
 expire_timers kernel/time/timer.c:1793 [inline]
 __run_timers+0x569/0x960 kernel/time/timer.c:2372
 __run_timer_base kernel/time/timer.c:2384 [inline]
 __run_timer_base kernel/time/timer.c:2376 [inline]
 run_timer_base+0x114/0x190 kernel/time/timer.c:2393
 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2403
 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:preempt_schedule_irq+0x4c/0x90 kernel/sched/core.c:7288
Code: df 55 65 48 8b 2d 5c f9 41 08 53 48 89 eb 48 c1 eb 03 48 01 c3 bf 01 00 00 00 e8 6f e1 f4 f5 e8 ea d2 2f f6 fb bf 01 00 00 00 <e8> af 99 ff ff 9c 58 fa f6 c4 02 75 1e bf 01 00 00 00 e8 6d 6c f4
RSP: 0018:ffffc9001bc7f7f8 EFLAGS: 00000206
RAX: 000000000136453f RBX: ffffed100617d488 RCX: 0000000000000006
RDX: 0000000000000000 RSI: ffffffff8de4d213 RDI: 0000000000000001
RBP: ffff888030bea440 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90aaec97 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 irqentry_exit+0x36/0x90 kernel/entry/common.c:197
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:lockdep_unregister_key+0xe9/0x140 kernel/locking/lockdep.c:6616
Code: 48 89 ef e8 b9 e5 ff ff 48 83 2d 19 02 5e 14 01 89 c3 e8 da ee ff ff 9c 58 f6 c4 02 75 52 41 f7 c4 00 02 00 00 74 01 fb 84 db <75> 1b 5b 5d 41 5c e9 4c 76 0a 00 8b 05 ea b6 13 0f 31 db 85 c0 74
RSP: 0018:ffffc9001bc7f8c0 EFLAGS: 00000246
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8df40882 RDI: ffffffff8c160d00
RBP: ffffffff975a6a38 R08: 0000000000083121 R09: ffffffff9605cc22
R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000246
R13: ffff88806a984000 R14: ffff88806a9844c0 R15: 0000000000000010
 __qdisc_destroy+0x11a/0x4d0 net/sched/sch_generic.c:1083
 qdisc_put+0xab/0xe0 net/sched/sch_generic.c:1109
 shutdown_scheduler_queue+0xa5/0x160 net/sched/sch_generic.c:1162
 netdev_for_each_tx_queue include/linux/netdevice.h:2657 [inline]
 dev_shutdown+0xb8/0x430 net/sched/sch_generic.c:1494
 unregister_netdevice_many_notify+0xb2c/0x24c0 net/core/dev.c:12144
 ops_exit_rtnl_list net/core/net_namespace.c:186 [inline]
 ops_undo_list+0x8fc/0xab0 net/core/net_namespace.c:247
 cleanup_net+0x408/0x890 net/core/net_namespace.c:682
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c2/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess):
   0:	df 55 65             	fists  0x65(%rbp)
   3:	48 8b 2d 5c f9 41 08 	mov    0x841f95c(%rip),%rbp        # 0x841f966
   a:	53                   	push   %rbx
   b:	48 89 eb             	mov    %rbp,%rbx
   e:	48 c1 eb 03          	shr    $0x3,%rbx
  12:	48 01 c3             	add    %rax,%rbx
  15:	bf 01 00 00 00       	mov    $0x1,%edi
  1a:	e8 6f e1 f4 f5       	call   0xf5f4e18e
  1f:	e8 ea d2 2f f6       	call   0xf62fd30e
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 af 99 ff ff       	call   0xffff99de <-- trapping instruction
  2f:	9c                   	pushf
  30:	58                   	pop    %rax
  31:	fa                   	cli
  32:	f6 c4 02             	test   $0x2,%ah
  35:	75 1e                	jne    0x55
  37:	bf 01 00 00 00       	mov    $0x1,%edi
  3c:	e8                   	.byte 0xe8
  3d:	6d                   	insl   (%dx),%es:(%rdi)
  3e:	6c                   	insb   (%dx),%es:(%rdi)
  3f:	f4                   	hlt