------------[ cut here ]------------
workqueue: cannot queue hci_conn_timeout on wq hci1
WARNING: CPU: 1 PID: 1092 at kernel/workqueue.c:2256 __queue_work+0xd38/0xfb0 kernel/workqueue.c:2254
Modules linked in:
CPU: 1 UID: 0 PID: 1092 Comm: kworker/u8:6 Not tainted 6.16.0-syzkaller-11322-g352af6a011d5 #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+0xd38/0xfb0 kernel/workqueue.c:2254
Code: 42 80 3c 20 00 74 08 4c 89 ef e8 b3 e3 98 00 49 8b 75 00 49 81 c7 78 01 00 00 48 c7 c7 80 dd 89 8b 4c 89 fa e8 c9 3a f9 ff 90 <0f> 0b 90 90 e9 1a f5 ff ff e8 6a 90 35 00 90 0f 0b 90 e9 dd fc ff
RSP: 0018:ffffc90000a08b10 EFLAGS: 00010046
RAX: 702ead7f667c7100 RBX: 0000000000000100 RCX: ffff8880266ebc00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 1ffff11005241338 R08: ffff8880b8724253 R09: 1ffff110170e484a
R10: dffffc0000000000 R11: ffffed10170e484b R12: dffffc0000000000
R13: ffff88807bfc8960 R14: 0000000000000008 R15: ffff888029209978
FS:  0000000000000000(0000) GS:ffff888125d2a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f06252efe46 CR3: 000000000df36000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
 expire_timers kernel/time/timer.c:1793 [inline]
 __run_timers kernel/time/timer.c:2372 [inline]
 __run_timer_base+0x646/0x860 kernel/time/timer.c:2384
 run_timer_base kernel/time/timer.c:2393 [inline]
 run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
 handle_softirqs+0x286/0x870 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xca/0x1f0 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+0xa6/0xc0 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:lockdep_unregister_key+0x2c5/0x310 kernel/locking/lockdep.c:6616
Code: 65 48 8b 05 0d e2 01 11 48 3b 44 24 10 0f 84 26 fe ff ff e8 8d e0 d9 09 e8 b8 e1 d9 09 41 f7 c7 00 02 00 00 74 bd fb 40 84 ed <75> bc eb cd 90 0f 0b 90 e9 19 ff ff ff 90 0f 0b 90 e9 2a ff ff ff
RSP: 0018:ffffc90003c3f578 EFLAGS: 00000246
RAX: 702ead7f667c7100 RBX: ffff888079d07a98 RCX: 702ead7f667c7100
RDX: ffffffff93632358 RSI: ffffffff8d9c50f0 RDI: ffffffff8be2fd00
RBP: ffff888079d07a00 R08: 0000000000000000 R09: ffffffff81aa7ef8
R10: dffffc0000000000 R11: fffffbfff1f464a7 R12: 0000000000000000
R13: 0000000000001000 R14: 0000000000000000 R15: 0000000000000212
 __qdisc_destroy+0x166/0x420 net/sched/sch_generic.c:1083
 qdisc_put net/sched/sch_generic.c:1109 [inline]
 dev_shutdown+0x34c/0x440 net/sched/sch_generic.c:1497
 unregister_netdevice_many_notify+0xe0f/0x1ff0 net/core/dev.c:12144
 unregister_netdevice_many net/core/dev.c:12219 [inline]
 default_device_exit_batch+0x819/0x890 net/core/dev.c:12723
 ops_exit_list net/core/net_namespace.c:204 [inline]
 ops_undo_list+0x525/0x990 net/core/net_namespace.c:251
 cleanup_net+0x4c5/0x800 net/core/net_namespace.c:682
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 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:	65 48 8b 05 0d e2 01 	mov    %gs:0x1101e20d(%rip),%rax        # 0x1101e215
   7:	11
   8:	48 3b 44 24 10       	cmp    0x10(%rsp),%rax
   d:	0f 84 26 fe ff ff    	je     0xfffffe39
  13:	e8 8d e0 d9 09       	call   0x9d9e0a5
  18:	e8 b8 e1 d9 09       	call   0x9d9e1d5
  1d:	41 f7 c7 00 02 00 00 	test   $0x200,%r15d
  24:	74 bd                	je     0xffffffe3
  26:	fb                   	sti
  27:	40 84 ed             	test   %bpl,%bpl
* 2a:	75 bc                	jne    0xffffffe8 <-- trapping instruction
  2c:	eb cd                	jmp    0xfffffffb
  2e:	90                   	nop
  2f:	0f 0b                	ud2
  31:	90                   	nop
  32:	e9 19 ff ff ff       	jmp    0xffffff50
  37:	90                   	nop
  38:	0f 0b                	ud2
  3a:	90                   	nop
  3b:	e9 2a ff ff ff       	jmp    0xffffff6a