------------[ cut here ]------------
workqueue: cannot queue hci_cmd_timeout on wq hci4
WARNING: CPU: 1 PID: 12508 at kernel/workqueue.c:2257 __queue_work+0xc9c/0x10f0 kernel/workqueue.c:2256
Modules linked in:
CPU: 1 UID: 0 PID: 12508 Comm: syz-executor Not tainted 6.15.0-rc6-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__queue_work+0xc9c/0x10f0 kernel/workqueue.c:2256
Code: 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 28 04 00 00 48 8b 75 18 4c 89 f2 48 c7 c7 40 e3 8b 8b e8 05 22 f7 ff 90 <0f> 0b 90 90 e9 96 f7 ff ff e8 b6 93 37 00 90 0f 0b 90 e9 1b f6 ff
RSP: 0018:ffffc90000a08be8 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817abff8
RDX: ffff88805888da00 RSI: ffffffff817ac005 RDI: 0000000000000001
RBP: ffff8880471a8930 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff9200014118f
R13: 0000000000000101 R14: ffff888012aa5178 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888124ae5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeca730870 CR3: 000000000e180000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 call_timer_fn+0x19a/0x620 kernel/time/timer.c:1789
 expire_timers kernel/time/timer.c:1835 [inline]
 __run_timers+0x569/0x960 kernel/time/timer.c:2414
 __run_timer_base kernel/time/timer.c:2426 [inline]
 __run_timer_base kernel/time/timer.c:2418 [inline]
 run_timer_base+0x114/0x190 kernel/time/timer.c:2435
 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2445
 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:1049 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049
 </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:7090
Code: df 55 65 48 8b 2d ec d2 37 08 53 48 89 eb 48 c1 eb 03 48 01 c3 bf 01 00 00 00 e8 2f 43 1d f6 e8 aa 16 57 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 7d ed 1c
RSP: 0018:ffffc9000426f838 EFLAGS: 00000202
RAX: 000000000002a8e9 RBX: ffffed100b111b40 RCX: 0000000000000006
RDX: 0000000000000000 RSI: ffffffff8dbdd983 RDI: 0000000000000001
RBP: ffff88805888da00 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90851817 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 irqentry_exit+0x36/0x90 kernel/entry/common.c:354
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:lock_acquire+0x62/0x350 kernel/locking/lockdep.c:5870
Code: 9e 0b 12 83 f8 07 0f 87 bc 02 00 00 89 c0 48 0f a3 05 52 06 ed 0e 0f 82 74 02 00 00 8b 35 ca 35 ed 0e 85 f6 0f 85 8d 00 00 00 <48> 8b 44 24 30 65 48 2b 05 29 9e 0b 12 0f 85 c7 02 00 00 48 83 c4
RSP: 0018:ffffc9000426f908 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffff888012aa5148 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8dbb838a RDI: ffffffff8bf46fa0
RBP: 0000000000000000 R08: 4832ad9aca33c019 R09: ffffffff969b11d8
R10: 0000000000000008 R11: 0000000000000001 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 touch_wq_lockdep_map+0xad/0x1c0 kernel/workqueue.c:3907
 __flush_workqueue+0x128/0x1230 kernel/workqueue.c:3949
 drain_workqueue+0x199/0x3d0 kernel/workqueue.c:4113
 hci_dev_close_sync+0x39b/0x11d0 net/bluetooth/hci_sync.c:5211
 hci_dev_do_close+0x2e/0x90 net/bluetooth/hci_core.c:483
 hci_unregister_dev+0x213/0x620 net/bluetooth/hci_core.c:2678
 vhci_release+0x79/0xf0 drivers/bluetooth/hci_vhci.c:665
 __fput+0x402/0xb70 fs/file_table.c:465
 task_work_run+0x150/0x240 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0xafb/0x2c30 kernel/exit.c:953
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
 __do_sys_exit_group kernel/exit.c:1113 [inline]
 __se_sys_exit_group kernel/exit.c:1111 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
 x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2f0a38e969
Code: Unable to access opcode bytes at 0x7f2f0a38e93f.
RSP: 002b:00007ffeca732a48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2f0a38e969
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000043
RBP: 00007f2f0a3ee8f0 R08: 00007ffeca7307e7 R09: 0000000000000003
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000003 R14: 00000000ffffffff R15: 00007ffeca732c00
 </TASK>
----------------
Code disassembly (best guess):
   0:	df 55 65             	fists  0x65(%rbp)
   3:	48 8b 2d ec d2 37 08 	mov    0x837d2ec(%rip),%rbp        # 0x837d2f6
   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 2f 43 1d f6       	call   0xf61d434e
  1f:	e8 aa 16 57 f6       	call   0xf65716ce
  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:	7d ed                	jge    0x2c
  3f:	1c                   	.byte 0x1c