INFO: task syz-executor0:21671 blocked for more than 140 seconds.
      Not tainted 4.9.127+ #91
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D28832 21671   2127 0x00000004
 ffff8801063f97c0 ffff880108f98000 ffff880107af6e00 ffff8801d865af80
 ffff8801db621018 ffff8801096f7cf8 ffffffff8277dc12 0000000000000000
 ffff8801063fa070 ffffed0020c7f40d 00ff8801063f97c0 ffff8801db6218f0
Call Trace:
 [<ffffffff8277f13f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff8277fac3>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff82781746>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff82781746>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff81fe9032>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
 [<ffffffff814e34b7>] filp_close+0xa7/0x140 fs/open.c:1129
 [<ffffffff8154c2d6>] __close_fd+0x156/0x230 fs/file.c:651
 [<ffffffff814e359c>] SYSC_close fs/open.c:1148 [inline]
 [<ffffffff814e359c>] SyS_close+0x4c/0x90 fs/open.c:1146
 [<ffffffff8100554f>] do_syscall_64+0x19f/0x480 arch/x86/entry/common.c:282
 [<ffffffff8278cd13>] 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: [<ffffffff81309d9c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81309d9c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813e6edc>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/2038:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff8278ade2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81cddbf2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor0/21671:
 #0:  (&evdev->mutex){+.+.+.}, at: [<ffffffff81fe9032>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350

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

NMI backtrace for cpu 0
CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.127+ #91
 ffff8801d9907d08 ffffffff81af11e9 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810967d0 ffff8801d9907d40
 ffffffff81afbf49 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81af11e9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81af11e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81afbf49>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81afbedc>] 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
 [<ffffffff8130a32d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8130a32d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8130a32d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8130a32d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff8113dd2d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8278cedc>] 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: 15886 Comm: syz-executor1 Not tainted 4.9.127+ #91
task: ffff8801d1045f00 task.stack: ffff8801c55c0000
RIP: 0010:[<ffffffff81380500>] 
c [<ffffffff81380500>] __bpf_prog_run+0x2d60/0x54b0 kernel/bpf/core.c:607
RSP: 0018:ffff8801c55c7940  EFLAGS: 00000a06
RAX: 1ffff920019a7006 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffffc9000cd38031 RSI: ffffffff813804f2 RDI: ffffc9000cd38031
RBP: ffff8801c55c7ca8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801c55c7c80
R13: ffffffff8288c840 R14: ffffc9000cd38030 R15: 00000000000000af
FS:  00007f32f569f700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001195308 CR3: 00000001c4b32000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d10467a0
c 00000000d10467f8
c 1ffff10038ab8f2c
c ffff8801d10467b0
c
 0000000041b58ab3
c ffffffff82c32470
c ffffffff8137d7a0
c ffffffff82c30ae0
c
 ffffffff811ff310
c 0000000000004768
c 0000000000000000
c ffff8801d10467d8
c
Call Trace:
 [<ffffffff8130c3bc>] seccomp_run_filters kernel/seccomp.c:200 [inline]
 [<ffffffff8130c3bc>] __seccomp_filter+0x14c/0xc80 kernel/seccomp.c:589
 [<ffffffff8130e8b6>] __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
 [<ffffffff8278cd13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
c08 
c84 
cd2 
c0f 
c85 
cd6 
c11 
c00 
c00 
c49 
c0f 
cbf 
c46 
c02 
c4d 
c8d 
c74 
cc6 
c08 
ce9 
c71 
cd3 
cff 
cff 
ce8 
c3e 
c92 
cf8 
cff 
c49 
c8d 
c7e 
c01 
c48 
c89 
cf8 
c48 
c89 
cfa 
c48 
cc1 
ce8 
c03 
c<83> 
ce2 
c07 
c0f 
cb6 
c04 
c18 
c38 
cd0 
c7f 
c08 
c84 
cc0 
c0f 
c85 
c9b 
c24 
c00 
c00 
c41 
c0f 
c