INFO: task syz-executor3:27523 blocked for more than 140 seconds.
      Not tainted 4.9.124+ #85
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3   D29056 27523  12217 0x00000004
 ffff88019a6d0000 0000000000000000 ffff8801baf91080 ffff8801d9edaf80
 ffff8801db6210d8 ffff8801d4c9fcf8 ffffffff8277cf52 0000000000000000
 ffff88019a6d08b0 ffffed00334da115 00ff88019a6d0000 ffff8801db6219b0
Call Trace:
 [<ffffffff8277e47f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff8277ee03>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff82780a86>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff82780a86>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff81fe95b2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
 [<ffffffff814f5897>] filp_close+0xa7/0x140 fs/open.c:1129
 [<ffffffff8155e686>] __close_fd+0x156/0x230 fs/file.c:651
 [<ffffffff814f597c>] SYSC_close fs/open.c:1148 [inline]
 [<ffffffff814f597c>] SyS_close+0x4c/0x90 fs/open.c:1146
 [<ffffffff8100554f>] do_syscall_64+0x19f/0x480 arch/x86/entry/common.c:282
 [<ffffffff8278c053>] 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: [<ffffffff81314210>] rcu_read_unlock include/linux/rcupdate.h:927 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81314210>] rcu_lock_break kernel/hung_task.c:143 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81314210>] check_hung_uninterruptible_tasks kernel/hung_task.c:177 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81314210>] watchdog+0x310/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813f99b9>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/2215:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff8278a122>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81cde522>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor3/27523:
 #0:  (&evdev->mutex){+.+.+.}, at: [<ffffffff81fe95b2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350

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

NMI backtrace for cpu 0
CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.124+ #85
 ffff8801d9497d08 ffffffff81af4b39 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff81096740 ffff8801d9497d40
 ffffffff81aff897 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81af4b39>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81af4b39>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81aff897>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81aff82a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff81096844>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff813145ad>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff813145ad>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff813145ad>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff813145ad>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff811410dd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8278c21c>] 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: 24095 Comm: syz-executor1 Not tainted 4.9.124+ #85
task: ffff8801a7325f00 task.stack: ffff8801bfe10000
RIP: 0010:[<ffffffff81390353>] 
c [<ffffffff81390353>] __bpf_prog_run+0xc3/0x54b0 kernel/bpf/core.c:584
RSP: 0018:ffff8801bfe17940  EFLAGS: 00000293
RAX: ffff8801a7325f00 RBX: dffffc0000000000 RCX: 1ffff10037fc2ffa
RDX: 0000000000000000 RSI: ffffffff81390353 RDI: ffff8801bfe17e48
RBP: ffff8801bfe17ca8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801bfe17c80
R13: ffffffff8288f300 R14: ffffc9000330a028 R15: ffff8801bfe17e48
FS:  00007f8a727d4700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020a07000 CR3: 00000001c002e000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801a73267a0
c 00000000a73267f8
c 1ffff10037fc2f2c
c ffff8801a73267b0
c
 0000000041b58ab3
c ffffffff82c32738
c ffffffff81390290
c ffffffff82c30d68
c
 ffffffff81202540
c 00000000000050b2
c 0000000000000000
c dffffc0000000000
c
Call Trace:
 [<ffffffff8131662c>] seccomp_run_filters kernel/seccomp.c:200 [inline]
 [<ffffffff8131662c>] __seccomp_filter+0x14c/0xc80 kernel/seccomp.c:589
 [<ffffffff81318b26>] __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
 [<ffffffff8278c053>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c