------------[ cut here ]------------
WARNING: CPU: 0 PID: 9706 at kernel/workqueue.c:1726 is_chained_work kernel/workqueue.c:1672 [inline]
WARNING: CPU: 0 PID: 9706 at kernel/workqueue.c:1726 __queue_work+0xd49/0x1020 kernel/workqueue.c:1725
Modules linked in:
CPU: 0 PID: 9706 Comm: syz-executor Not tainted 6.6.96-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__queue_work+0xd49/0x1020 kernel/workqueue.c:1725
Code: 4c 89 f7 48 89 de 89 e9 e8 d4 e3 00 00 48 8b 5c 24 10 e9 10 ff ff ff e8 05 39 2f 00 eb 0c e8 fe 38 2f 00 eb 05 e8 f7 38 2f 00 <0f> 0b 48 83 c4 78 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 e1 38 2f 00
RSP: 0018:ffffc90000007b10 EFLAGS: 00010046
RAX: ffffffff81565d5b RBX: 0000000000000100 RCX: ffff88805fcfbc00
RDX: 0000000000000100 RSI: 0000000000000100 RDI: 0000000000000000
RBP: ffff8880664791c0 R08: ffffffff8e4a7faf R09: 1ffffffff1c94ff5
R10: dffffc0000000000 R11: fffffbfff1c94ff6 R12: 0000000000000008
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff888066479000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd3e3187e9c CR3: 000000000cb30000 CR4: 00000000003506f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 call_timer_fn+0x16e/0x530 kernel/time/timer.c:1700
 expire_timers kernel/time/timer.c:1746 [inline]
 __run_timers+0x558/0x7d0 kernel/time/timer.c:2022
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:7010
Code: 44 24 20 f6 44 24 21 02 74 0b 0f 0b 48 f7 03 08 00 00 00 74 63 bf 01 00 00 00 e8 2b b2 e4 f6 e8 56 49 15 f7 fb bf 01 00 00 00 <e8> 2b b5 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc90003447600 EFLAGS: 00000286
RAX: 53361e0b1b050b00 RBX: 0000000000000000 RCX: 53361e0b1b050b00
RDX: dffffc0000000000 RSI: ffffffff8aaab2c0 RDI: 0000000000000001
RBP: ffffc900034476a0 R08: ffffffff90da5667 R09: 1ffffffff21b4acc
R10: dffffc0000000000 R11: fffffbfff21b4acd R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000688ec0
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:692
RIP: 0010:lock_acquire+0x1f2/0x410 kernel/locking/lockdep.c:5758
Code: 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 0f 85 f5 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 66 43 c7 44 3c 09 00 00 43 c6 44 3c 0b 00
RSP: 0018:ffffc90003447760 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 53361e0b1b050b00
RDX: 0000000000000001 RSI: ffffffff8aaac440 RDI: ffffffff8afc6d00
RBP: ffffc90003447868 R08: dffffc0000000000 R09: 1ffffffff26c88e6
R10: dffffc0000000000 R11: fffffbfff26c88e7 R12: 1ffff92000688ef8
R13: ffff888066479138 R14: 0000000000000246 R15: dffffc0000000000
 touch_wq_lockdep_map kernel/workqueue.c:3138 [inline]
 __flush_workqueue+0x141/0x1380 kernel/workqueue.c:3168
 drain_workqueue+0xd3/0x380 kernel/workqueue.c:3332
 hci_dev_close_sync+0x4b9/0xfb0 net/bluetooth/hci_sync.c:5213
 hci_dev_do_close net/bluetooth/hci_core.c:505 [inline]
 hci_unregister_dev+0x206/0x500 net/bluetooth/hci_core.c:2683
 vhci_release+0x83/0xd0 drivers/bluetooth/hci_vhci.c:666
 __fput+0x234/0x970 fs/file_table.c:384
 task_work_run+0x1ce/0x250 kernel/task_work.c:239
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0x90b/0x23c0 kernel/exit.c:883
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1024
 __do_sys_exit_group kernel/exit.c:1035 [inline]
 __se_sys_exit_group kernel/exit.c:1033 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1033
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fcbf118e929
Code: Unable to access opcode bytes at 0x7fcbf118e8ff.
RSP: 002b:00007ffd794f9d98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcbf118e929
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000043
RBP: 00007fcbf11ee8f0 R08: 00007ffd794f7b37 R09: 0000000000000003
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000003 R14: 00000000ffffffff R15: 00007ffd794f9f50
 </TASK>
----------------
Code disassembly (best guess):
   0:	44 24 20             	rex.R and $0x20,%al
   3:	f6 44 24 21 02       	testb  $0x2,0x21(%rsp)
   8:	74 0b                	je     0x15
   a:	0f 0b                	ud2
   c:	48 f7 03 08 00 00 00 	testq  $0x8,(%rbx)
  13:	74 63                	je     0x78
  15:	bf 01 00 00 00       	mov    $0x1,%edi
  1a:	e8 2b b2 e4 f6       	call   0xf6e4b24a
  1f:	e8 56 49 15 f7       	call   0xf715497a
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 2b b5 ff ff       	call   0xffffb55a <-- trapping instruction
  2f:	48 c7 44 24 40 00 00 	movq   $0x0,0x40(%rsp)
  36:	00 00
  38:	9c                   	pushf
  39:	8f 44 24 40          	pop    0x40(%rsp)
  3d:	8b                   	.byte 0x8b
  3e:	44                   	rex.R
  3f:	24                   	.byte 0x24