possible deadlock in fasync_remove

possible deadlock in fasync_remove_entry
Status: upstream: reported on 2021/01/09 13:05
Reported-by: syzbot+5252d2712377e3867125@syzkaller.appspotmail.com
First crash: 99d, last: now

Sample crash report:

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
5.12.0-rc7-syzkaller #0 Not tainted
-----------------------------------------------------
syz-executor.3/20576 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffff888011ca4b38 (&f->f_owner.lock){.+.?}-{2:2}, at: send_sigio+0x24/0x370 fs/fcntl.c:795

and this task is already holding:
ffff8880183e1018 (&new->fa_lock){....}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:1012 [inline]
ffff8880183e1018 (&new->fa_lock){....}-{2:2}, at: kill_fasync fs/fcntl.c:1033 [inline]
ffff8880183e1018 (&new->fa_lock){....}-{2:2}, at: kill_fasync+0x14b/0x460 fs/fcntl.c:1026
which would create a new lock dependency:
 (&new->fa_lock){....}-{2:2} -> (&f->f_owner.lock){.+.?}-{2:2}

but this new dependency connects a SOFTIRQ-irq-safe lock:
 (fasync_lock){+.+.}-{2:2}

... which became SOFTIRQ-irq-safe at:
  lock_acquire kernel/locking/lockdep.c:5511 [inline]
  lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476
  __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]
  fasync_remove_entry+0x2e/0x1f0 fs/fcntl.c:885
  fasync_helper+0x9e/0xb0 fs/fcntl.c:993
  __tty_fasync drivers/tty/tty_io.c:2246 [inline]
  tty_release+0x16d/0x1210 drivers/tty/tty_io.c:1764
  __fput+0x288/0x920 fs/file_table.c:280
  task_work_run+0xdd/0x1a0 kernel/task_work.c:140
  tracehook_notify_resume include/linux/tracehook.h:189 [inline]
  exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
  exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208
  __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
  syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
  entry_SYSCALL_64_after_hwframe+0x44/0xae

to a SOFTIRQ-irq-unsafe lock:
 (&f->f_owner.lock){.+.?}-{2:2}

... which became SOFTIRQ-irq-unsafe at:
...
  lock_acquire kernel/locking/lockdep.c:5511 [inline]
  lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476
  __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
  _raw_read_lock_irqsave+0x45/0x90 kernel/locking/spinlock.c:231
  send_sigurg+0x1e/0xac0 fs/fcntl.c:834
  sk_send_sigurg+0x76/0x300 net/core/sock.c:2946
  tcp_check_urg.isra.0+0x1f4/0x710 net/ipv4/tcp_input.c:5503
  tcp_urg net/ipv4/tcp_input.c:5544 [inline]
  tcp_rcv_established+0x106c/0x1eb0 net/ipv4/tcp_input.c:5878
  tcp_v6_do_rcv+0x41d/0x12b0 net/ipv6/tcp_ipv6.c:1490
  tcp_v6_rcv+0x3004/0x36a0 net/ipv6/tcp_ipv6.c:1723
  ip6_protocol_deliver_rcu+0x2e9/0x17f0 net/ipv6/ip6_input.c:422
  ip6_input_finish+0x7f/0x160 net/ipv6/ip6_input.c:463
  NF_HOOK include/linux/netfilter.h:301 [inline]
  NF_HOOK include/linux/netfilter.h:295 [inline]
  ip6_input+0x9c/0xd0 net/ipv6/ip6_input.c:472
  dst_input include/net/dst.h:458 [inline]
  ip6_rcv_finish net/ipv6/ip6_input.c:76 [inline]
  NF_HOOK include/linux/netfilter.h:301 [inline]
  NF_HOOK include/linux/netfilter.h:295 [inline]
  ipv6_rcv+0x28e/0x3c0 net/ipv6/ip6_input.c:297
  __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5384
  __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5498
  process_backlog+0x232/0x6c0 net/core/dev.c:6365
  __napi_poll+0xaf/0x440 net/core/dev.c:6912
  napi_poll net/core/dev.c:6979 [inline]
  net_rx_action+0x801/0xb40 net/core/dev.c:7066
  __do_softirq+0x29b/0x9f6 kernel/softirq.c:345
  invoke_softirq kernel/softirq.c:221 [inline]
  __irq_exit_rcu kernel/softirq.c:422 [inline]
  irq_exit_rcu+0x134/0x200 kernel/softirq.c:434
  sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
  asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
  __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
  _raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:191
  debug_object_free lib/debugobjects.c:847 [inline]
  debug_object_free+0x1c0/0x350 lib/debugobjects.c:820
  futex_wait+0x548/0x5f0 kernel/futex.c:2742
  do_futex+0x15d/0x1710 kernel/futex.c:3734
  __do_sys_futex+0x2a2/0x470 kernel/futex.c:3797
  do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
  entry_SYSCALL_64_after_hwframe+0x44/0xae

other info that might help us debug this:

Chain exists of:
  fasync_lock --> &new->fa_lock --> &f->f_owner.lock

 Possible interrupt unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&f->f_owner.lock);
                               local_irq_disable();
                               lock(fasync_lock);
                               lock(&new->fa_lock);
  <Interrupt>
    lock(fasync_lock);

 *** DEADLOCK ***

8 locks held by syz-executor.3/20576:
 #0: ffff888144e55110 (&evdev->mutex){+.+.}-{3:3}, at: evdev_write+0x1d3/0x760 drivers/input/evdev.c:513
 #1: ffff88801cdb8230 (&dev->event_lock){-...}-{2:2}, at: input_inject_event+0xa6/0x310 drivers/input/input.c:471
 #2: ffffffff8bf74360 (rcu_read_lock){....}-{1:2}, at: is_event_supported drivers/input/input.c:53 [inline]
 #2: ffffffff8bf74360 (rcu_read_lock){....}-{1:2}, at: is_event_supported drivers/input/input.c:50 [inline]
 #2: ffffffff8bf74360 (rcu_read_lock){....}-{1:2}, at: input_inject_event+0x92/0x310 drivers/input/input.c:470
 #3: ffffffff8bf74360 (rcu_read_lock){....}-{1:2}, at: input_pass_values.part.0+0x0/0x700 drivers/input/input.c:837
 #4: ffffffff8bf74360 (rcu_read_lock){....}-{1:2}, at: evdev_events+0x59/0x3f0 drivers/input/evdev.c:296
 #5: ffff88802f921028 (&client->buffer_lock){....}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline]
 #5: ffff88802f921028 (&client->buffer_lock){....}-{2:2}, at: evdev_pass_values.part.0+0xf6/0x970 drivers/input/evdev.c:261
 #6: ffffffff8bf74360 (rcu_read_lock){....}-{1:2}, at: kill_fasync+0x3d/0x460 fs/fcntl.c:1031
 #7: ffff8880183e1018 (&new->fa_lock){....}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:1012 [inline]
 #7: ffff8880183e1018 (&new->fa_lock){....}-{2:2}, at: kill_fasync fs/fcntl.c:1033 [inline]
 #7: ffff8880183e1018 (&new->fa_lock){....}-{2:2}, at: kill_fasync+0x14b/0x460 fs/fcntl.c:1026

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
 -> (fasync_lock){+.+.}-{2:2} {
    HARDIRQ-ON-W at:
                      lock_acquire kernel/locking/lockdep.c:5511 [inline]
                      lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476
                      __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]
                      fasync_remove_entry+0x2e/0x1f0 fs/fcntl.c:885
                      fasync_helper+0x9e/0xb0 fs/fcntl.c:993
                      __tty_fasync drivers/tty/tty_io.c:2246 [inline]
                      tty_release+0x16d/0x1210 drivers/tty/tty_io.c:1764
                      __fput+0x288/0x920 fs/file_table.c:280
                      task_work_run+0xdd/0x1a0 kernel/task_work.c:140
                      tracehook_notify_resume include/linux/tracehook.h:189 [inline]
                      exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
                      exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208
                      __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
                      syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
                      entry_SYSCALL_64_after_hwframe+0x44/0xae
    SOFTIRQ-ON-W at:
                      lock_acquire kernel/locking/lockdep.c:5511 [inline]
                      lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476
                      __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]
                      fasync_remove_entry+0x2e/0x1f0 fs/fcntl.c:885
                      fasync_helper+0x9e/0xb0 fs/fcntl.c:993
                      __tty_fasync drivers/tty/tty_io.c:2246 [inline]
                      tty_release+0x16d/0x1210 drivers/tty/tty_io.c:1764
                      __fput+0x288/0x920 fs/file_table.c:280
                      task_work_run+0xdd/0x1a0 kernel/task_work.c:140
                      tracehook_notify_resume include/linux/tracehook.h:189 [inline]
                      exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
                      exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208
                      __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
                      syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
                      entry_SYSCALL_64_after_hwframe+0x44/0xae
    INITIAL USE at:
                     lock_acquire kernel/locking/lockdep.c:5511 [inline]
                     lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476
                     __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]
                     fasync_remove_entry+0x2e/0x1f0 fs/fcntl.c:885
                     fasync_helper+0x9e/0xb0 fs/fcntl.c:993
                     __tty_fasync drivers/tty/tty_io.c:2246 [inline]
                     tty_release+0x16d/0x1210 drivers/tty/tty_io.c:1764
                     __fput+0x288/0x920 fs/file_table.c:280
                     task_work_run+0xdd/0x1a0 kernel/task_work.c:140
                     tracehook_notify_resume include/linux/tracehook.h:189 [inline]
                     exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
                     exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208
                     __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
                     syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
                     entry_SYSCALL_64_after_hwframe+0x44/0xae
  }
  ... key      at: [<ffffffff8c0d7f18>] fasync_lock+0x18/0x8e0
  ... acquired at:
   __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline]
   _raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:311
   fasync_remove_entry+0xb6/0x1f0 fs/fcntl.c:890
   fasync_helper+0x9e/0xb0 fs/fcntl.c:993
   __tty_fasync drivers/tty/tty_io.c:2246 [inline]
   tty_fasync+0x17b/0x390 drivers/tty/tty_io.c:2279
   __fput+0x712/0x920 fs/file_table.c:277
   task_work_run+0xdd/0x1a0 kernel/task_work.c:140
   tracehook_notify_resume include/linux/tracehook.h:189 [inline]
   exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
   exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208
   __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
   syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
   entry_SYSCALL_64_after_hwframe+0x44/0xae

-> (&new->fa_lock){....}-{2:2} {
   INITIAL USE at:
                   lock_acquire kernel/locking/lockdep.c:5511 [inline]
                   lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline]
                   _raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:311
                   fasync_remove_entry+0xb6/0x1f0 fs/fcntl.c:890
                   fasync_helper+0x9e/0xb0 fs/fcntl.c:993
                   __tty_fasync drivers/tty/tty_io.c:2246 [inline]
                   tty_fasync+0x17b/0x390 drivers/tty/tty_io.c:2279
                   __fput+0x712/0x920 fs/file_table.c:277
                   task_work_run+0xdd/0x1a0 kernel/task_work.c:140
                   tracehook_notify_resume include/linux/tracehook.h:189 [inline]
                   exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
                   exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208
                   __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
                   syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
                   entry_SYSCALL_64_after_hwframe+0x44/0xae
   INITIAL READ USE at:
                        lock_acquire kernel/locking/lockdep.c:5511 [inline]
                        lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476
                        __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
                        _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
                        kill_fasync_rcu fs/fcntl.c:1012 [inline]
                        kill_fasync fs/fcntl.c:1033 [inline]
                        kill_fasync+0x14b/0x460 fs/fcntl.c:1026
                        __pass_event drivers/input/evdev.c:240 [inline]
                        evdev_pass_values.part.0+0x64e/0x970 drivers/input/evdev.c:278
                        evdev_pass_values drivers/input/evdev.c:253 [inline]
                        evdev_events+0x28b/0x3f0 drivers/input/evdev.c:306
                        input_to_handler+0x2a0/0x4c0 drivers/input/input.c:115
                        input_pass_values.part.0+0x284/0x700 drivers/input/input.c:145
                        input_pass_values drivers/input/input.c:134 [inline]
                        input_handle_event+0x373/0x1440 drivers/input/input.c:404
                        input_inject_event+0x2f5/0x310 drivers/input/input.c:476
                        evdev_write+0x430/0x760 drivers/input/evdev.c:530
                        vfs_write+0x28e/0xa30 fs/read_write.c:603
                        ksys_write+0x1ee/0x250 fs/read_write.c:658
                        do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
                        entry_SYSCALL_64_after_hwframe+0x44/0xae
 }
 ... key      at: [<ffffffff8fe97140>] __key.0+0x0/0x40
 ... acquired at:
   lock_acquire kernel/locking/lockdep.c:5511 [inline]
   lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
   _raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:231
   send_sigio+0x24/0x370 fs/fcntl.c:795
   kill_fasync_rcu fs/fcntl.c:1019 [inline]
   kill_fasync fs/fcntl.c:1033 [inline]
   kill_fasync+0x205/0x460 fs/fcntl.c:1026
   __pass_event drivers/input/evdev.c:240 [inline]
   evdev_pass_values.part.0+0x64e/0x970 drivers/input/evdev.c:278
   evdev_pass_values drivers/input/evdev.c:253 [inline]
   evdev_events+0x28b/0x3f0 drivers/input/evdev.c:306
   input_to_handler+0x2a0/0x4c0 drivers/input/input.c:115
   input_pass_values.part.0+0x284/0x700 drivers/input/input.c:145
   input_pass_values drivers/input/input.c:134 [inline]
   input_handle_event+0x373/0x1440 drivers/input/input.c:404
   input_inject_event+0x2f5/0x310 drivers/input/input.c:476
   evdev_write+0x430/0x760 drivers/input/evdev.c:530
   vfs_write+0x28e/0xa30 fs/read_write.c:603
   ksys_write+0x1ee/0x250 fs/read_write.c:658
   do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
   entry_SYSCALL_64_after_hwframe+0x44/0xae


the dependencies between the lock to be acquired
 and SOFTIRQ-irq-unsafe lock:
-> (&f->f_owner.lock){.+.?}-{2:2} {
   HARDIRQ-ON-R at:
                    lock_acquire kernel/locking/lockdep.c:5511 [inline]
                    lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476
                    __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
                    _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
                    f_getown+0x23/0x2a0 fs/fcntl.c:153
                    do_fcntl+0xc41/0x1200 fs/fcntl.c:388
                    __do_sys_fcntl fs/fcntl.c:471 [inline]
                    __se_sys_fcntl fs/fcntl.c:456 [inline]
                    __x64_sys_fcntl+0x165/0x1e0 fs/fcntl.c:456
                    do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
                    entry_SYSCALL_64_after_hwframe+0x44/0xae
   IN-SOFTIRQ-R at:
                    lock_acquire kernel/locking/lockdep.c:5511 [inline]
                    lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476
                    __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
                    _raw_read_lock_irqsave+0x45/0x90 kernel/locking/spinlock.c:231
                    send_sigurg+0x1e/0xac0 fs/fcntl.c:834
                    sk_send_sigurg+0x76/0x300 net/core/sock.c:2946
                    tcp_check_urg.isra.0+0x1f4/0x710 net/ipv4/tcp_input.c:5503
                    tcp_urg net/ipv4/tcp_input.c:5544 [inline]
                    tcp_rcv_established+0x106c/0x1eb0 net/ipv4/tcp_input.c:5878
                    tcp_v6_do_rcv+0x41d/0x12b0 net/ipv6/tcp_ipv6.c:1490
                    tcp_v6_rcv+0x3004/0x36a0 net/ipv6/tcp_ipv6.c:1723
                    ip6_protocol_deliver_rcu+0x2e9/0x17f0 net/ipv6/ip6_input.c:422
                    ip6_input_finish+0x7f/0x160 net/ipv6/ip6_input.c:463
                    NF_HOOK include/linux/netfilter.h:301 [inline]
                    NF_HOOK include/linux/netfilter.h:295 [inline]
                    ip6_input+0x9c/0xd0 net/ipv6/ip6_input.c:472
                    dst_input include/net/dst.h:458 [inline]
                    ip6_rcv_finish net/ipv6/ip6_input.c:76 [inline]
                    NF_HOOK include/linux/netfilter.h:301 [inline]
                    NF_HOOK include/linux/netfilter.h:295 [inline]
                    ipv6_rcv+0x28e/0x3c0 net/ipv6/ip6_input.c:297
                    __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5384
                    __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5498
                    process_backlog+0x232/0x6c0 net/core/dev.c:6365
                    __napi_poll+0xaf/0x440 net/core/dev.c:6912
                    napi_poll net/core/dev.c:6979 [inline]
                    net_rx_action+0x801/0xb40 net/core/dev.c:7066
                    __do_softirq+0x29b/0x9f6 kernel/softirq.c:345
                    invoke_softirq kernel/softirq.c:221 [inline]
                    __irq_exit_rcu kernel/softirq.c:422 [inline]
                    irq_exit_rcu+0x134/0x200 kernel/softirq.c:434
                    sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
                    asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
                    __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
                    _raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:191
                    debug_object_free lib/debugobjects.c:847 [inline]
                    debug_object_free+0x1c0/0x350 lib/debugobjects.c:820
                    futex_wait+0x548/0x5f0 kernel/futex.c:2742
                    do_futex+0x15d/0x1710 kernel/futex.c:3734
                    __do_sys_futex+0x2a2/0x470 kernel/futex.c:3797
                    do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
                    entry_SYSCALL_64_after_hwframe+0x44/0xae
   SOFTIRQ-ON-R at:
                    lock_acquire kernel/locking/lockdep.c:5511 [inline]
                    lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476
                    __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
                    _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
                    f_getown+0x23/0x2a0 fs/fcntl.c:153
                    do_fcntl+0xc41/0x1200 fs/fcntl.c:388
                    __do_sys_fcntl fs/fcntl.c:471 [inline]
                    __se_sys_fcntl fs/fcntl.c:456 [inline]
                    __x64_sys_fcntl+0x165/0x1e0 fs/fcntl.c:456
                    do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
                    entry_SYSCALL_64_after_hwframe+0x44/0xae
   INITIAL USE at:
                   lock_acquire kernel/locking/lockdep.c:5511 [inline]
                   lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline]
                   _raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:311
                   f_modown+0x2a/0x390 fs/fcntl.c:91
                   __f_setown fs/fcntl.c:110 [inline]
                   f_setown+0xf4/0x230 fs/fcntl.c:138
                   sock_ioctl+0x1de/0x6a0 net/socket.c:1120
                   vfs_ioctl fs/ioctl.c:48 [inline]
                   __do_sys_ioctl fs/ioctl.c:753 [inline]
                   __se_sys_ioctl fs/ioctl.c:739 [inline]
                   __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
                   do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
                   entry_SYSCALL_64_after_hwframe+0x44/0xae
   INITIAL READ USE at:
                        lock_acquire kernel/locking/lockdep.c:5511 [inline]
                        lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476
                        __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
                        _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223
                        f_getown+0x23/0x2a0 fs/fcntl.c:153
                        do_fcntl+0xc41/0x1200 fs/fcntl.c:388
                        __do_sys_fcntl fs/fcntl.c:471 [inline]
                        __se_sys_fcntl fs/fcntl.c:456 [inline]
                        __x64_sys_fcntl+0x165/0x1e0 fs/fcntl.c:456
                        do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
                        entry_SYSCALL_64_after_hwframe+0x44/0xae
 }
 ... key      at: [<ffffffff8fe96360>] __key.5+0x0/0x40
 ... acquired at:
   lock_acquire kernel/locking/lockdep.c:5511 [inline]
   lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
   _raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:231
   send_sigio+0x24/0x370 fs/fcntl.c:795
   kill_fasync_rcu fs/fcntl.c:1019 [inline]
   kill_fasync fs/fcntl.c:1033 [inline]
   kill_fasync+0x205/0x460 fs/fcntl.c:1026
   __pass_event drivers/input/evdev.c:240 [inline]
   evdev_pass_values.part.0+0x64e/0x970 drivers/input/evdev.c:278
   evdev_pass_values drivers/input/evdev.c:253 [inline]
   evdev_events+0x28b/0x3f0 drivers/input/evdev.c:306
   input_to_handler+0x2a0/0x4c0 drivers/input/input.c:115
   input_pass_values.part.0+0x284/0x700 drivers/input/input.c:145
   input_pass_values drivers/input/input.c:134 [inline]
   input_handle_event+0x373/0x1440 drivers/input/input.c:404
   input_inject_event+0x2f5/0x310 drivers/input/input.c:476
   evdev_write+0x430/0x760 drivers/input/evdev.c:530
   vfs_write+0x28e/0xa30 fs/read_write.c:603
   ksys_write+0x1ee/0x250 fs/read_write.c:658
   do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
   entry_SYSCALL_64_after_hwframe+0x44/0xae


stack backtrace:
CPU: 0 PID: 20576 Comm: syz-executor.3 Not tainted 5.12.0-rc7-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_bad_irq_dependency kernel/locking/lockdep.c:2461 [inline]
 check_irq_usage.cold+0x50d/0x744 kernel/locking/lockdep.c:2690
 check_prev_add kernel/locking/lockdep.c:2941 [inline]
 check_prevs_add kernel/locking/lockdep.c:3060 [inline]
 validate_chain kernel/locking/lockdep.c:3675 [inline]
 __lock_acquire+0x2b2c/0x54c0 kernel/locking/lockdep.c:4901
 lock_acquire kernel/locking/lockdep.c:5511 [inline]
 lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476
 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
 _raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:231
 send_sigio+0x24/0x370 fs/fcntl.c:795
 kill_fasync_rcu fs/fcntl.c:1019 [inline]
 kill_fasync fs/fcntl.c:1033 [inline]
 kill_fasync+0x205/0x460 fs/fcntl.c:1026
 __pass_event drivers/input/evdev.c:240 [inline]
 evdev_pass_values.part.0+0x64e/0x970 drivers/input/evdev.c:278
 evdev_pass_values drivers/input/evdev.c:253 [inline]
 evdev_events+0x28b/0x3f0 drivers/input/evdev.c:306
 input_to_handler+0x2a0/0x4c0 drivers/input/input.c:115
 input_pass_values.part.0+0x284/0x700 drivers/input/input.c:145
 input_pass_values drivers/input/input.c:134 [inline]
 input_handle_event+0x373/0x1440 drivers/input/input.c:404
 input_inject_event+0x2f5/0x310 drivers/input/input.c:476
 evdev_write+0x430/0x760 drivers/input/evdev.c:530
 vfs_write+0x28e/0xa30 fs/read_write.c:603
 ksys_write+0x1ee/0x250 fs/read_write.c:658
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x466459
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4f66993188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459
RDX: 00000000000002b8 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 0000000000a9fb1f R14: 00007f4f66993300 R15: 0000000000022000

Crashes (70):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci-upstream-kasan-gce	2021/04/15 08:41	upstream	7f75285c	fcdb12ba	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-root	2021/04/14 14:48	upstream	50987bec	3134b37f	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce	2021/04/11 08:28	upstream	52e44129	bfeda1b1	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-selinux-root	2021/04/10 11:26	upstream	d4961772	bfeda1b1	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce	2021/04/10 05:06	upstream	17e7124a	6a81331a	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-smack-root	2021/04/08 16:10	upstream	454859c5	6a81331a	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-selinux-root	2021/04/08 13:55	upstream	454859c5	6a81331a	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-smack-root	2021/04/06 04:14	upstream	0a50438c	6a81331a	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce	2021/04/04 18:39	upstream	2023a53b	6a81331a	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-smack-root	2021/04/03 04:00	upstream	d93a0d43	6a81331a	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce	2021/03/31 06:57	upstream	2bb25b3a	6a81331a	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-selinux-root	2021/03/29 14:22	upstream	a5e13c6d	a8529b82	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-qemu-upstream	2021/03/28 20:36	upstream	36a14638	a8529b82	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-selinux-root	2021/03/26 15:16	upstream	db24726b	a8529b82	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-qemu-upstream	2021/03/26 02:27	upstream	00232240	6a383ecf	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-smack-root	2021/03/25 20:32	upstream	e1381380	6a383ecf	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-root	2021/03/23 16:18	upstream	84196390	e613994b	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-selinux-root	2021/03/20 04:52	upstream	1c273e10	3d01c4de	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce	2021/03/03 17:03	upstream	f69d02e3	06ed56cd	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce	2021/03/03 13:36	upstream	f69d02e3	e5b64d68	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-root	2021/03/01 20:53	upstream	7a7fd0de	183afb6c	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-selinux-root	2021/03/01 00:30	upstream	cd278456	4c37c133	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-root	2021/02/26 10:19	upstream	2c87f7a3	76f7fc95	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-qemu-upstream	2021/02/19 16:25	upstream	f40ddce8	f689d40a	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce	2021/02/17 08:41	upstream	f40ddce8	052f8d9f	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce	2021/02/12 09:42	upstream	dcc0b490	a5f86b15	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-smack-root	2021/02/07 09:37	upstream	825b5991	2ce644fc	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce	2021/02/05 01:22	upstream	5c279c4c	23a562df	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-smack-root	2021/02/03 16:01	upstream	3aaf0a27	624dad51	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce	2021/02/02 07:08	upstream	88bb507a	e6b95f32	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce	2021/01/30 06:32	upstream	0e9bcda5	fc9fd31e	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-smack-root	2021/01/28 22:12	upstream	e5ff2cb9	7df34f59	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce	2021/01/26 12:24	upstream	f8ad8187	52e37319	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-smack-root	2021/01/26 01:04	upstream	f8ad8187	52e37319	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-smack-root	2021/01/23 23:15	upstream	e1ae4b0b	52e37319	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-root	2021/01/22 22:28	upstream	83d09ad4	4080af96	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce	2021/01/22 02:06	upstream	9791581c	d4f4eca5	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce	2021/01/21 11:37	upstream	9791581c	d4f4eca5	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-smack-root	2021/01/20 07:52	upstream	45dfb8a5	63631df1	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-smack-root	2021/01/18 03:08	upstream	a1339d63	fd103621	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce	2021/01/17 17:17	upstream	0da0a8a0	813be542	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-386	2021/04/14 02:57	upstream	eebe426d	a184b83e	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-386	2021/04/11 03:27	upstream	52e44129	bfeda1b1	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-386	2021/04/05 21:59	upstream	0a50438c	6a81331a	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-386	2021/04/02 13:31	upstream	1678e493	6a81331a	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-386	2021/03/29 07:39	upstream	36a14638	a8529b82	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-386	2021/03/26 08:23	upstream	db24726b	6a383ecf	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-386	2021/03/01 17:10	upstream	fe07bfda	4c37c133	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-386	2021/02/10 21:27	upstream	291009f6	a52ee10a	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-386	2021/02/03 22:45	upstream	3afe9076	624dad51	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-386	2021/02/03 21:05	upstream	3afe9076	624dad51	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-386	2021/01/22 21:04	upstream	83d09ad4	4080af96	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-386	2021/01/19 02:14	upstream	19c329f6	63631df1	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-linux-next-kasan-gce-root	2021/04/02 09:27	linux-next	454c576c	6a81331a	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-linux-next-kasan-gce-root	2021/01/23 10:38	linux-next	bc085f8f	52e37319	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-linux-next-kasan-gce-root	2021/01/21 14:21	linux-next	bc085f8f	d4f4eca5	.config	log	report	info	possible deadlock in fasync_remove_entry
ci-upstream-kasan-gce-selinux-root	2021/01/16 13:18	upstream	1d94330a	65a7a854	.config	log	report	info
ci-upstream-kasan-gce	2021/01/09 23:34	upstream	996e435f	2c1f2513	.config	log	report	info
ci-upstream-kasan-gce-root	2021/01/08 14:55	upstream	f5e6c330	c104d4a3	.config	log	report	info
ci-upstream-kasan-gce-selinux-root	2021/01/07 05:46	upstream	9f1abbe9	c104d4a3	.config	log	report	info
ci-upstream-kasan-gce-root	2021/01/05 16:21	upstream	36bbbd0e	a0234d98	.config	log	report	info
ci-upstream-kasan-gce	2021/01/05 12:57	upstream	36bbbd0e	a0234d98	.config	log	report	info
ci-upstream-kasan-gce-386	2021/01/12 04:29	upstream	a0d54b4f	2c1f2513	.config	log	report	info
ci-upstream-kasan-gce-386	2021/01/09 20:01	upstream	996e435f	2c1f2513	.config	log	report	info
ci-upstream-kasan-gce-386	2021/01/09 17:45	upstream	996e435f	2c1f2513	.config	log	report	info
ci-upstream-kasan-gce-386	2021/01/09 12:29	upstream	996e435f	a6c52263	.config	log	report	info
ci-upstream-kasan-gce-386	2021/01/08 22:42	upstream	6279d812	c104d4a3	.config	log	report	info
ci-upstream-kasan-gce-386	2021/01/05 15:36	upstream	36bbbd0e	a0234d98	.config	log	report	info
ci-upstream-linux-next-kasan-gce-root	2021/01/15 11:10	linux-next	b3a3cbde	65a7a854	.config	log	report	info