INFO: task syz-executor1:13843 blocked for more than 140 seconds.
      Not tainted 4.9.128+ #93
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1   D28832 13843   2096 0x00000004
 ffff8801d2f1af80 ffff8801d6630b00 ffff8801d6630b00 ffff8801d2f1c740
 ffff8801db721018 ffff8801c8f77cf8 ffffffff8277ee02 0000000000000000
 ffff8801d2f1b830 ffffed003a5e3705 00ff8801d2f1af80 ffff8801db7218f0
Call Trace:
 [<ffffffff8278032f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff82780cb3>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff82782936>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff82782936>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff81fea2b2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
 [<ffffffff814e3487>] filp_close+0xa7/0x140 fs/open.c:1129
 [<ffffffff8154c2a6>] __close_fd+0x156/0x230 fs/file.c:651
 [<ffffffff814e356c>] SYSC_close fs/open.c:1148 [inline]
 [<ffffffff814e356c>] SyS_close+0x4c/0x90 fs/open.c:1146
 [<ffffffff8100554f>] do_syscall_64+0x19f/0x480 arch/x86/entry/common.c:282
 [<ffffffff8278df13>] 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: [<ffffffff8130a0ac>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8130a0ac>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813e71ec>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/2030:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff8278bfd2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81cdee72>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor1/13843:
 #0:  (&evdev->mutex){+.+.+.}, at: [<ffffffff81fea2b2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
1 lock held by syz-executor1/13853:
 #0:  (&evdev->mutex){+.+.+.}, at: [<ffffffff81fea2b2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
1 lock held by syz-executor1/13850:
 #0:  (&evdev->mutex){+.+.+.}, at: [<ffffffff81fea2b2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350

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

NMI backtrace for cpu 0
CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.128+ #93
 ffff8801d9907d08 ffffffff81af2469 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810967d0 ffff8801d9907d40
 ffffffff81afd1c9 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81af2469>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81af2469>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81afd1c9>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81afd15c>] 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
 [<ffffffff8130a63d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8130a63d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8130a63d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8130a63d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff8113e00d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8278e0dc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3871 Comm: syz-executor3 Not tainted 4.9.128+ #93
task: ffff8801c94a2f80 task.stack: ffff8801ab6d8000
RIP: 0010:[<ffffffff81309a40>] 
c [<ffffffff81309a40>] __sanitizer_cov_trace_pc+0x0/0x50
RSP: 0018:ffff8801ab6df938  EFLAGS: 00000246
RAX: ffffffff8137eb70 RBX: dffffc0000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8137db73 RDI: ffffffff8288cce8
RBP: ffff8801ab6dfca8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801ab6dfc80
R13: ffffffff8288c840 R14: ffffc9000ccf7048 R15: 0000000000000095
FS:  00007f42ee2f5700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9017e91000 CR3: 00000001cb3f8000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8137eb75
c ffff8801c94a3828
c 00000000c94a3830
c 1ffff100356dbf2c
c
 ffffffff83a2bc48
c 0000000041b58ab3
c ffffffff82c325f8
c ffffffff8137dab0
c
 0000000000003be9
c 0000000000000000
c dffffc0000000000
c 0000000002ea5cd4
c
Call Trace:
 [<ffffffff8130c6cc>] seccomp_run_filters kernel/seccomp.c:200 [inline]
 [<ffffffff8130c6cc>] __seccomp_filter+0x14c/0xc80 kernel/seccomp.c:589
 [<ffffffff8130ebc6>] __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
 [<ffffffff8278df13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
c1c 
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c84 
c00 
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c<55> 
c48 
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c04 
c25 
c00 
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c01 
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c7e 
c81 
c