inconsistent lock state in sco_conn

inconsistent lock state in sco_conn_del
Status: upstream: reported C repro on 2020/08/11 17:07
Reported-by: syzbot+65684128cd7c35bc66a1@syzkaller.appspotmail.com
First crash: 161d, last: 20d

Cause bisection: introduced by (bisect log) :
commit 135b8b37bd91cc82f83e98fca109b80375f5317e
Author: Kenny Yu <kennyyu@fb.com>
Date: Tue Jun 21 18:04:36 2016 +0000

cgroup: Add pids controller event when fork fails because of pid limit

Crash: INFO: suspicious RCU usage in pids_can_fork (log)
Repro: C syz .config

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.14	inconsistent lock state in sco_conn_del	syz			20	4d06h	172d	0/1	upstream: reported syz repro on 2020/07/31 12:31
linux-4.19	inconsistent lock state in sco_conn_del	C			8	2d19h	133d	0/1	upstream: reported C repro on 2020/09/07 19:17

Sample crash report:

================================
WARNING: inconsistent lock state
5.9.0-rc4-syzkaller #0 Not tainted
--------------------------------
inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage.
syz-executor675/31233 [HC0[0]:SC0[0]:HE1:SE1] takes:
ffff8880a75c50a0 (slock-AF_BLUETOOTH-BTPROTO_SCO){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline]
ffff8880a75c50a0 (slock-AF_BLUETOOTH-BTPROTO_SCO){+.?.}-{2:2}, at: sco_conn_del+0x128/0x270 net/bluetooth/sco.c:176
{IN-SOFTIRQ-W} state was registered at:
  lock_acquire+0x1f3/0xae0 kernel/locking/lockdep.c:5006
  __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+0x24/0x140 net/bluetooth/sco.c:83
  call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1413
  expire_timers kernel/time/timer.c:1458 [inline]
  __run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755
  __run_timers kernel/time/timer.c:1736 [inline]
  run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768
  __do_softirq+0x1f7/0xa91 kernel/softirq.c:298
  asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
  __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
  run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
  do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77
  invoke_softirq kernel/softirq.c:393 [inline]
  __irq_exit_rcu kernel/softirq.c:423 [inline]
  irq_exit_rcu+0x235/0x280 kernel/softirq.c:435
  sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091
  asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
  unwind_next_frame+0x139a/0x1f90 arch/x86/kernel/unwind_orc.c:607
  arch_stack_walk+0x81/0xf0 arch/x86/kernel/stacktrace.c:25
  stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
  kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
  kasan_set_track mm/kasan/common.c:56 [inline]
  __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
  slab_post_alloc_hook mm/slab.h:518 [inline]
  slab_alloc mm/slab.c:3312 [inline]
  kmem_cache_alloc+0x13a/0x3a0 mm/slab.c:3482
  __d_alloc+0x2a/0x950 fs/dcache.c:1709
  d_alloc+0x4a/0x230 fs/dcache.c:1788
  d_alloc_parallel+0xe9/0x18e0 fs/dcache.c:2540
  lookup_open.isra.0+0x9ac/0x1350 fs/namei.c:3030
  open_last_lookups fs/namei.c:3177 [inline]
  path_openat+0x96d/0x2730 fs/namei.c:3365
  do_filp_open+0x17e/0x3c0 fs/namei.c:3395
  do_sys_openat2+0x16d/0x420 fs/open.c:1168
  do_sys_open fs/open.c:1184 [inline]
  __do_sys_open fs/open.c:1192 [inline]
  __se_sys_open fs/open.c:1188 [inline]
  __x64_sys_open+0x119/0x1c0 fs/open.c:1188
  do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
  entry_SYSCALL_64_after_hwframe+0x44/0xa9
irq event stamp: 853
hardirqs last  enabled at (853): [<ffffffff87f733af>] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
hardirqs last  enabled at (853): [<ffffffff87f733af>] _raw_spin_unlock_irq+0x1f/0x80 kernel/locking/spinlock.c:199
hardirqs last disabled at (852): [<ffffffff87f73764>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline]
hardirqs last disabled at (852): [<ffffffff87f73764>] _raw_spin_lock_irq+0xa4/0xd0 kernel/locking/spinlock.c:167
softirqs last  enabled at (0): [<ffffffff8144c929>] copy_process+0x1a99/0x6920 kernel/fork.c:2018
softirqs last disabled at (0): [<0000000000000000>] 0x0

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-executor675/31233:
 #0: ffff88809f104f40 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0xf5/0x1080 net/bluetooth/hci_core.c:1720
 #1: ffff88809f104078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_do_close+0x253/0x1080 net/bluetooth/hci_core.c:1757
 #2: ffffffff8a9188c8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1435 [inline]
 #2: ffffffff8a9188c8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xc7/0x220 net/bluetooth/hci_conn.c:1557

stack backtrace:
CPU: 1 PID: 31233 Comm: syz-executor675 Not tainted 5.9.0-rc4-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+0x198/0x1fd lib/dump_stack.c:118
 print_usage_bug kernel/locking/lockdep.c:4020 [inline]
 valid_state kernel/locking/lockdep.c:3361 [inline]
 mark_lock_irq kernel/locking/lockdep.c:3560 [inline]
 mark_lock.cold+0x7a/0x7f kernel/locking/lockdep.c:4006
 mark_usage kernel/locking/lockdep.c:3923 [inline]
 __lock_acquire+0x876/0x5570 kernel/locking/lockdep.c:4380
 lock_acquire+0x1f3/0xae0 kernel/locking/lockdep.c:5006
 __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+0x128/0x270 net/bluetooth/sco.c:176
 sco_disconn_cfm net/bluetooth/sco.c:1178 [inline]
 sco_disconn_cfm+0x62/0x80 net/bluetooth/sco.c:1171
 hci_disconn_cfm include/net/bluetooth/hci_core.h:1438 [inline]
 hci_conn_hash_flush+0x114/0x220 net/bluetooth/hci_conn.c:1557
 hci_dev_do_close+0x5c6/0x1080 net/bluetooth/hci_core.c:1770
 hci_unregister_dev+0x1bd/0xe30 net/bluetooth/hci_core.c:3790
 vhci_release+0x70/0xe0 drivers/bluetooth/hci_vhci.c:340
 __fput+0x285/0x920 fs/file_table.c:281
 task_work_run+0xdd/0x190 kernel/task_work.c:141
 exit_task_work include/linux/task_work.h:25 [inline]
 do_exit+0xb7d/0x29f0 kernel/exit.c:806
 do_group_exit+0x125/0x310 kernel/exit.c:903
 get_signal+0x428/0x1f00 kernel/signal.c:2757
 arch_do_signal+0x82/0x2520 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:159 [inline]
 exit_to_user_mode_prepare+0x1ae/0x200 kernel/entry/common.c:190
 syscall_exit_to_user_mode+0x7e/0x2e0 kernel/entry/common.c:265
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x447279
Code: Bad RIP value.
RSP: 002b:00007fd19f624d88 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00000000006dcc28 RCX: 0000000000447279
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dcc28
RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc2c
R13: 0000000000000004 R14: 0000000000000003 R15: 00007fd19f6256d0

Fix bisection attempts:
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro
ci-upstream-kasan-gce-selinux-root	2020/12/23 13:46	upstream	614cb589	79fb24e2	.config	log	report	syz	C
ci-upstream-kasan-gce-selinux-root	2020/11/23 13:20	upstream	418baf2c	79fb24e2	.config	log	report	syz	C
ci-upstream-kasan-gce-selinux-root	2020/10/24 13:00	upstream	f11901ed	79fb24e2	.config	log	report	syz	C

Crashes (6):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Maintainers
ci-upstream-kasan-gce-selinux-root	2020/09/12 01:34	upstream	e8878ab8	79fb24e2	.config	log	report	syz	C		davem@davemloft.net, johan.hedberg@gmail.com, kuba@kernel.org, linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, marcel@holtmann.org, netdev@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/09/24 12:38	linux-next	dcf2427b	54289b08	.config	log	report	syz	C		davem@davemloft.net, johan.hedberg@gmail.com, kuba@kernel.org, linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, marcel@holtmann.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2020/12/30 02:51	upstream	139711f0	0fa352f2	.config	log	report			info	davem@davemloft.net, johan.hedberg@gmail.com, kuba@kernel.org, linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, luiz.dentz@gmail.com, marcel@holtmann.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/08/16 03:01	upstream	c9c9735c	424dd8e7	.config	log	report				davem@davemloft.net, johan.hedberg@gmail.com, kuba@kernel.org, linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, marcel@holtmann.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2020/08/14 04:47	upstream	990f2273	54ce1ed6	.config	log	report				davem@davemloft.net, johan.hedberg@gmail.com, kuba@kernel.org, linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, marcel@holtmann.org, netdev@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/08/11 02:41	linux-next	f80535b9	7adc7b65	.config	log	report				davem@davemloft.net, johan.hedberg@gmail.com, kuba@kernel.org, linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, marcel@holtmann.org, netdev@vger.kernel.org