syzbot

================================
WARNING: inconsistent lock state
4.19.167-syzkaller #0 Not tainted
--------------------------------
inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage.
syz-executor104/2297 [HC0[0]:SC0[0]:HE1:SE1] takes:
0000000080de040c (slock-AF_BLUETOOTH-BTPROTO_SCO){+.?.}, at: spin_lock include/linux/spinlock.h:329 [inline]
0000000080de040c (slock-AF_BLUETOOTH-BTPROTO_SCO){+.?.}, at: sco_conn_del+0xe2/0x240 net/bluetooth/sco.c:175
{IN-SOFTIRQ-W} state was registered at:
  __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
  _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144
  spin_lock include/linux/spinlock.h:329 [inline]
  sco_sock_timeout+0x31/0x210 net/bluetooth/sco.c:82
  call_timer_fn+0x177/0x700 kernel/time/timer.c:1338
  expire_timers+0x243/0x4e0 kernel/time/timer.c:1375
  __run_timers kernel/time/timer.c:1696 [inline]
  run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709
  __do_softirq+0x26c/0x9a0 kernel/softirq.c:292
  invoke_softirq kernel/softirq.c:372 [inline]
  irq_exit+0x215/0x260 kernel/softirq.c:412
  exiting_irq arch/x86/include/asm/apic.h:545 [inline]
  smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094
  apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
  arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
  lock_release+0x429/0x8b0 kernel/locking/lockdep.c:3929
  alloc_set_pte+0x927/0x1a00 mm/memory.c:3588
  filemap_map_pages+0xd66/0x11c0 mm/filemap.c:2700
  do_fault_around mm/memory.c:3735 [inline]
  do_read_fault mm/memory.c:3769 [inline]
  do_fault mm/memory.c:3903 [inline]
  handle_pte_fault mm/memory.c:4134 [inline]
  __handle_mm_fault+0x2a8e/0x41c0 mm/memory.c:4258
  handle_mm_fault+0x436/0xb10 mm/memory.c:4295
  __do_page_fault+0x68e/0xd60 arch/x86/mm/fault.c:1412
  page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1205
irq event stamp: 1201
hardirqs last  enabled at (1201): [<ffffffff881607c4>] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
hardirqs last  enabled at (1201): [<ffffffff881607c4>] _raw_spin_unlock_irq+0x24/0x80 kernel/locking/spinlock.c:192
hardirqs last disabled at (1200): [<ffffffff88160455>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline]
hardirqs last disabled at (1200): [<ffffffff88160455>] _raw_spin_lock_irq+0x35/0x80 kernel/locking/spinlock.c:160
softirqs last  enabled at (238): [<ffffffff876551d0>] sco_sock_connect+0x5b0/0xa90 net/bluetooth/sco.c:584
softirqs last disabled at (236): [<ffffffff868cce4b>] spin_lock_bh include/linux/spinlock.h:334 [inline]
softirqs last disabled at (236): [<ffffffff868cce4b>] release_sock+0x1b/0x1b0 net/core/sock.c:2879

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 ***

3 locks held by syz-executor104/2297:
 #0: 00000000da46d8a2 (&hdev->req_lock){+.+.}, at: hci_dev_do_close+0x196/0xf10 net/bluetooth/hci_core.c:1616
 #1: 00000000d9a3f969 (&hdev->lock){+.+.}, at: hci_dev_do_close+0x2e0/0xf10 net/bluetooth/hci_core.c:1653
 #2: 00000000d345c75b (hci_cb_list_lock){+.+.}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1258 [inline]
 #2: 00000000d345c75b (hci_cb_list_lock){+.+.}, at: hci_conn_hash_flush+0xda/0x260 net/bluetooth/hci_conn.c:1512

stack backtrace:
CPU: 0 PID: 2297 Comm: syz-executor104 Not tainted 4.19.167-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2fe lib/dump_stack.c:118
 print_usage_bug.cold+0x42e/0x570 kernel/locking/lockdep.c:2544
 valid_state kernel/locking/lockdep.c:2557 [inline]
 mark_lock_irq kernel/locking/lockdep.c:2751 [inline]
 mark_lock+0xc70/0x1160 kernel/locking/lockdep.c:3131
 mark_irqflags kernel/locking/lockdep.c:3027 [inline]
 __lock_acquire+0x6a8/0x3ff0 kernel/locking/lockdep.c:3372
 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3907
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144
 spin_lock include/linux/spinlock.h:329 [inline]
 sco_conn_del+0xe2/0x240 net/bluetooth/sco.c:175
 sco_disconn_cfm+0x74/0xb0 net/bluetooth/sco.c:1133
 hci_disconn_cfm include/net/bluetooth/hci_core.h:1261 [inline]
 hci_conn_hash_flush+0x127/0x260 net/bluetooth/hci_conn.c:1512
 hci_dev_do_close+0x659/0xf10 net/bluetooth/hci_core.c:1666
 hci_unregister_dev+0x18b/0x910 net/bluetooth/hci_core.c:3271
 vhci_release+0x70/0xe0 drivers/bluetooth/hci_vhci.c:354
 __fput+0x2ce/0x890 fs/file_table.c:278
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0xbed/0x2be0 kernel/exit.c:890
 do_group_exit+0x125/0x310 kernel/exit.c:993
 get_signal+0x3f2/0x1f70 kernel/signal.c:2589
 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:821
 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4474d9
Code: e8 4c e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f2106e8ecf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00000000006dcc28 RCX: 00000000004474d9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dcc28
RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc2c
R13: 00007ffdccc5149f R14: 00007f2106e8f9c0 R15: 0000000000000064
Bluetooth: hci3: command 0x0405 tx timeout