================================
WARNING: inconsistent lock state
5.12.0-rc2-syzkaller #0 Not tainted
--------------------------------
inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
ksoftirqd/0/13 [HC0[0]:SC1[1]:HE1:SE0] takes:
ffff8880701190a0 (slock-AF_BLUETOOTH-BTPROTO_SCO){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline]
ffff8880701190a0 (slock-AF_BLUETOOTH-BTPROTO_SCO){+.?.}-{2:2}, at: sco_sock_timeout+0x33/0x1b0 net/bluetooth/sco.c:83
{SOFTIRQ-ON-W} state was registered at:
  lock_acquire kernel/locking/lockdep.c:5510 [inline]
  lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5475
  __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
  _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
  spin_lock include/linux/spinlock.h:354 [inline]
  sco_conn_del+0x134/0x2b0 net/bluetooth/sco.c:176
  sco_disconn_cfm+0x74/0xb0 net/bluetooth/sco.c:1189
  hci_disconn_cfm include/net/bluetooth/hci_core.h:1486 [inline]
  hci_conn_hash_flush+0x127/0x260 net/bluetooth/hci_conn.c:1598
  hci_dev_do_close+0x569/0x1110 net/bluetooth/hci_core.c:1778
  hci_unregister_dev+0x263/0x1130 net/bluetooth/hci_core.c:3989
  vhci_release+0x70/0xe0 drivers/bluetooth/hci_vhci.c:340
  __fput+0x288/0x920 fs/file_table.c:280
  task_work_run+0xdd/0x1a0 kernel/task_work.c:140
  exit_task_work include/linux/task_work.h:30 [inline]
  do_exit+0xbfc/0x2a60 kernel/exit.c:825
  do_group_exit+0x125/0x310 kernel/exit.c:922
  get_signal+0x42c/0x2100 kernel/signal.c:2773
  arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811
  handle_signal_work kernel/entry/common.c:147 [inline]
  exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
  exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:208
  __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
  syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:301
  entry_SYSCALL_64_after_hwframe+0x44/0xae
irq event stamp: 3310940
hardirqs last  enabled at (3310940): [<ffffffff8907afcf>] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
hardirqs last  enabled at (3310940): [<ffffffff8907afcf>] _raw_spin_unlock_irq+0x1f/0x40 kernel/locking/spinlock.c:199
hardirqs last disabled at (3310939): [<ffffffff8907ada1>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline]
hardirqs last disabled at (3310939): [<ffffffff8907ada1>] _raw_spin_lock_irq+0x41/0x50 kernel/locking/spinlock.c:167
softirqs last  enabled at (3310894): [<ffffffff814508bd>] run_ksoftirqd kernel/softirq.c:652 [inline]
softirqs last  enabled at (3310894): [<ffffffff814508bd>] run_ksoftirqd+0x2d/0x60 kernel/softirq.c:644
softirqs last disabled at (3310899): [<ffffffff814508bd>] run_ksoftirqd kernel/softirq.c:652 [inline]
softirqs last disabled at (3310899): [<ffffffff814508bd>] run_ksoftirqd+0x2d/0x60 kernel/softirq.c:644

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(slock-AF_BLUETOOTH-BTPROTO_SCO);
  <Interrupt>
    lock(slock-AF_BLUETOOTH-BTPROTO_SCO);

 *** DEADLOCK ***

1 lock held by ksoftirqd/0/13:
 #0: ffffc90000d27c10 ((&sk->sk_timer)#3){+.-.}-{0:0}, at: lockdep_copy_map include/linux/lockdep.h:35 [inline]
 #0: ffffc90000d27c10 ((&sk->sk_timer)#3){+.-.}-{0:0}, at: call_timer_fn+0xd5/0x6b0 kernel/time/timer.c:1421

stack backtrace:
CPU: 0 PID: 13 Comm: ksoftirqd/0 Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 print_usage_bug kernel/locking/lockdep.c:202 [inline]
 valid_state kernel/locking/lockdep.c:3818 [inline]
 mark_lock_irq kernel/locking/lockdep.c:4021 [inline]
 mark_lock.cold+0x61/0x8e kernel/locking/lockdep.c:4478
 mark_usage kernel/locking/lockdep.c:4373 [inline]
 __lock_acquire+0x11b7/0x54c0 kernel/locking/lockdep.c:4854
 lock_acquire kernel/locking/lockdep.c:5510 [inline]
 lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5475
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
 spin_lock include/linux/spinlock.h:354 [inline]
 sco_sock_timeout+0x33/0x1b0 net/bluetooth/sco.c:83
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1431
 expire_timers kernel/time/timer.c:1476 [inline]
 __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1745
 __run_timers kernel/time/timer.c:1726 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1758
 __do_softirq+0x29b/0x9f6 kernel/softirq.c:345
 run_ksoftirqd kernel/softirq.c:652 [inline]
 run_ksoftirqd+0x2d/0x60 kernel/softirq.c:644
 smpboot_thread_fn+0x655/0x9e0 kernel/smpboot.c:165
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294