input: syz0 as /devices/virtual/input/input37
================================
WARNING: inconsistent lock state
4.14.193-syzkaller #0 Not tainted
--------------------------------
inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage.
kworker/1:3/7389 [HC0[0]:SC0[0]:HE1:SE1] takes:
 (slock-AF_BLUETOOTH-BTPROTO_SCO){+.?.}, at: [<ffffffff85bb2ef0>] spin_lock include/linux/spinlock.h:317 [inline]
 (slock-AF_BLUETOOTH-BTPROTO_SCO){+.?.}, at: [<ffffffff85bb2ef0>] sco_conn_del+0xb0/0x1e0 net/bluetooth/sco.c:175
{IN-SOFTIRQ-W} state was registered at:
  lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
  __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
  _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152
  spin_lock include/linux/spinlock.h:317 [inline]
  sco_sock_timeout+0x1a/0x150 net/bluetooth/sco.c:82
  call_timer_fn+0x14a/0x650 kernel/time/timer.c:1280
  expire_timers+0x232/0x4d0 kernel/time/timer.c:1319
  __run_timers kernel/time/timer.c:1644 [inline]
  run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1657
  __do_softirq+0x254/0xa1d kernel/softirq.c:288
  invoke_softirq kernel/softirq.c:368 [inline]
  irq_exit+0x193/0x240 kernel/softirq.c:409
  exiting_irq arch/x86/include/asm/apic.h:648 [inline]
  smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102
  apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793
  deref_stack_reg+0x28/0x1a0 arch/x86/kernel/unwind_orc.c:292
  unwind_next_frame+0xc98/0x17d0 arch/x86/kernel/unwind_orc.c:432
  __save_stack_trace+0x90/0x160 arch/x86/kernel/stacktrace.c:44
  save_stack mm/kasan/kasan.c:447 [inline]
  set_track mm/kasan/kasan.c:459 [inline]
  kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
  __do_kmalloc_node mm/slab.c:3682 [inline]
  __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3696
  __kmalloc_reserve net/core/skbuff.c:137 [inline]
  __alloc_skb+0x96/0x510 net/core/skbuff.c:205
  alloc_skb include/linux/skbuff.h:980 [inline]
  nlmsg_new include/net/netlink.h:511 [inline]
  audit_buffer_alloc kernel/audit.c:1639 [inline]
  audit_log_start.part.0+0x233/0x650 kernel/audit.c:1753
  audit_log_start+0x45/0x70 kernel/audit.c:1713
  __audit_seccomp+0x2d/0x220 kernel/auditsc.c:2451
  audit_seccomp include/linux/audit.h:318 [inline]
  seccomp_log kernel/seccomp.c:607 [inline]
  __seccomp_filter+0x2c9/0xd60 kernel/seccomp.c:770
  __secure_computing+0xdd/0x3e0 kernel/seccomp.c:798
  syscall_trace_enter+0x359/0xc20 arch/x86/entry/common.c:121
  do_syscall_64+0x41b/0x640 arch/x86/entry/common.c:283
  entry_SYSCALL_64_after_hwframe+0x46/0xbb
irq event stamp: 583525
hardirqs last  enabled at (583525): [<ffffffff8185386a>] kfree+0x14a/0x250 mm/slab.c:3816
hardirqs last disabled at (583524): [<ffffffff8185378f>] kfree+0x6f/0x250 mm/slab.c:3809
softirqs last  enabled at (583346): [<ffffffff85109760>] spin_unlock_bh include/linux/spinlock.h:362 [inline]
softirqs last  enabled at (583346): [<ffffffff85109760>] peernet2id+0x60/0x70 net/core/net_namespace.c:245
softirqs last disabled at (583344): [<ffffffff85109720>] spin_lock_bh include/linux/spinlock.h:322 [inline]
softirqs last disabled at (583344): [<ffffffff85109720>] peernet2id+0x20/0x70 net/core/net_namespace.c:243

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 ***

6 locks held by kworker/1:3/7389:
 #0:  ("events"){+.+.}, at: [<ffffffff813ba640>] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087
 #1:  ((rfkill_op_work).work){+.+.}, at: [<ffffffff813ba676>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091
 #2:  (rfkill_global_mutex){+.+.}, at: [<ffffffff8627354f>] rfkill_epo+0x2f/0x130 net/rfkill/core.c:442
 #3:  (&hdev->req_lock){+.+.}, at: [<ffffffff85af5c0d>] hci_dev_do_close+0xfd/0xc50 net/bluetooth/hci_core.c:1576
 #4:  (&hdev->lock){+.+.}, at: [<ffffffff85af5d20>] hci_dev_do_close+0x210/0xc50 net/bluetooth/hci_core.c:1607
 #5:  (hci_cb_list_lock){+.+.}, at: [<ffffffff85b09f87>] hci_disconn_cfm include/net/bluetooth/hci_core.h:1223 [inline]
 #5:  (hci_cb_list_lock){+.+.}, at: [<ffffffff85b09f87>] hci_conn_hash_flush+0xc7/0x220 net/bluetooth/hci_conn.c:1376

stack backtrace:
CPU: 1 PID: 7389 Comm: kworker/1:3 Not tainted 4.14.193-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events rfkill_op_handler
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 print_usage_bug.cold+0x42e/0x570 kernel/locking/lockdep.c:2589
 valid_state kernel/locking/lockdep.c:2602 [inline]
 mark_lock_irq kernel/locking/lockdep.c:2796 [inline]
 mark_lock+0xb4d/0x1050 kernel/locking/lockdep.c:3194
 mark_irqflags kernel/locking/lockdep.c:3090 [inline]
 __lock_acquire+0xd5c/0x3f20 kernel/locking/lockdep.c:3448
 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152
 spin_lock include/linux/spinlock.h:317 [inline]
 sco_conn_del+0xb0/0x1e0 net/bluetooth/sco.c:175
 sco_disconn_cfm net/bluetooth/sco.c:1134 [inline]
 sco_disconn_cfm+0x50/0x60 net/bluetooth/sco.c:1127
 hci_disconn_cfm include/net/bluetooth/hci_core.h:1226 [inline]
 hci_conn_hash_flush+0x114/0x220 net/bluetooth/hci_conn.c:1376
 hci_dev_do_close+0x542/0xc50 net/bluetooth/hci_core.c:1620
 hci_rfkill_set_block net/bluetooth/hci_core.c:2050 [inline]
 hci_rfkill_set_block+0x94/0xe0 net/bluetooth/hci_core.c:2037
 rfkill_set_block+0x1b2/0x4a0 net/rfkill/core.c:337
 rfkill_epo+0x68/0x130 net/rfkill/core.c:446
 __rfkill_handle_global_op net/rfkill/input.c:63 [inline]
 rfkill_op_handler+0x180/0x1c0 net/rfkill/input.c:111
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
misc userio: Can't change port type on an already running userio instance
input: syz0 as /devices/virtual/input/input39
input: syz0 as /devices/virtual/input/input40
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
nla_parse: 9 callbacks suppressed
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'.
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'.
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'.
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'.
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'.
overlayfs: empty lowerdir
overlayfs: filesystem on './bus' not supported as upperdir