INFO: task syz-executor3:26630 blocked for more than 140 seconds.
      Not tainted 4.9.126+ #38
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3   D28832 26630   2112 0x00000004
 ffff88014dd917c0 ffff8801d08f9600 ffff8801d08f9600 ffff88014e84df00
 ffff8801db721018 ffff88014ac57cf8 ffffffff8277d952 0000000000000000
 ffff88014dd92070 ffffed0029bb240d 00ff88014dd917c0 ffff8801db7218f0
Call Trace:
 [<ffffffff8277ee7f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff8277f803>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff82781486>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff82781486>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff81fe8de2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
 [<ffffffff814e3427>] filp_close+0xa7/0x140 fs/open.c:1129
 [<ffffffff8154c216>] __close_fd+0x156/0x230 fs/file.c:651
 [<ffffffff814e350c>] SYSC_close fs/open.c:1148 [inline]
 [<ffffffff814e350c>] SyS_close+0x4c/0x90 fs/open.c:1146
 [<ffffffff8100554f>] do_syscall_64+0x19f/0x480 arch/x86/entry/common.c:282
 [<ffffffff8278ca53>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/24:
 #0:  (rcu_read_lock){......}, at: [<ffffffff81309d0c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81309d0c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813e6e4c>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/2022:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff8278ab22>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81cdd9a2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor3/26630:
 #0:  (&evdev->mutex){+.+.+.}, at: [<ffffffff81fe8de2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.126+ #38
 ffff8801d9907d08 ffffffff81af1049 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810967d0 ffff8801d9907d40
 ffffffff81afbda9 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81af1049>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81af1049>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81afbda9>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81afbd3c>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff810968d4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8130a29d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8130a29d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8130a29d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8130a29d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff8113dc9d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8278cc1c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8155 Comm: syz-executor4 Not tainted 4.9.126+ #38
task: ffff88014e3eaf80 task.stack: ffff88014a768000
RIP: 0010:[<ffffffff813096a0>] 
c [<ffffffff813096a0>] __sanitizer_cov_trace_pc+0x0/0x50
RSP: 0018:ffff88014a76f938  EFLAGS: 00000246
RAX: ffffffff8138045d RBX: dffffc0000000000 RCX: 1ffff100294edffa
RDX: 0000000000000000 RSI: ffffffff8137d7d3 RDI: ffffffff8288cdb8
RBP: ffff88014a76fca8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88014a76fc80
R13: ffffffff8288c840 R14: ffffc9000fb78028 R15: 00000000000000af
FS:  00007f9c596c8700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002030e000 CR3: 00000001cbe35000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Stack:
 ffffffff81380462
c ffff88014e3eb820
c 000000004e3eb878
c 1ffff100294edf2c
c
 ffff88014e3eb830
c 0000000041b58ab3
c ffffffff82c32370
c ffffffff8137d710
c
 ffffffff82c309e0
c ffffffff811ff280
c dffffc0000000000
c 0000000002ea6172
c
Call Trace:
 [<ffffffff8130c32c>] seccomp_run_filters kernel/seccomp.c:200 [inline]
 [<ffffffff8130c32c>] __seccomp_filter+0x14c/0xc80 kernel/seccomp.c:589
 [<ffffffff8130e826>] __secure_computing+0xa6/0x290 kernel/seccomp.c:692
 [<ffffffff81004940>] syscall_trace_enter+0x550/0xd20 arch/x86/entry/common.c:117
 [<ffffffff8100566c>] do_syscall_64+0x2bc/0x480 arch/x86/entry/common.c:273
 [<ffffffff8278ca53>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c<55> 
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c