INFO: task syz-executor5:3215 blocked for more than 140 seconds.
      Not tainted 4.9.126+ #90
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5   D29688  3215   2105 0x00000004
 ffff880193360000 ffff8801a3420b00 ffff8801cafd1080 ffff8801a3544740
 ffff8801db721018 ffff88019c01fcf8 ffffffff8277d952 0000000000000000
 ffff8801933608b0 ffffed003266c115 00ff880193360000 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: [<ffffffff81309f00>] rcu_read_unlock include/linux/rcupdate.h:927 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81309f00>] rcu_lock_break kernel/hung_task.c:143 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81309f00>] check_hung_uninterruptible_tasks kernel/hung_task.c:177 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81309f00>] watchdog+0x310/0xa20 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/2026:
 #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-executor5/3215:
 #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+ #90
 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: 403 Comm: syz-executor1 Not tainted 4.9.126+ #90
task: ffff8801a3695f00 task.stack: ffff8801a1060000
RIP: 0010:[<ffffffff813804b9>] 
c [<ffffffff813804b9>] __bpf_prog_run+0x2da9/0x54b0 kernel/bpf/core.c:607
RSP: 0018:ffff8801a1067940  EFLAGS: 00000202
RAX: 0000000000000007 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000007 RSI: ffffffff81380462 RDI: ffff8801a10679f8
RBP: ffff8801a1067ca8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801a1067c80
R13: ffffffff8288c840 R14: ffffc9000f84b030 R15: 0000000000000007
FS:  00007f9b94d0b700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000f023e0 CR3: 00000001c6da3000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801a36967a8
c 00000000a36967b0
c 1ffff1003420cf2c
c ffffffff811f463b
c
 0000000041b58ab3
c ffffffff82c32370
c ffffffff8137d710
c ffff8801db6182c0
c
 0000000000000000
c 0000000000003a84
c 0000000000000000
c dffffc0000000000
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: 
c48 
c8d 
cbc 
cd5 
c18 
cfd 
cff 
cff 
c48 
c89 
cf9 
c48 
cc1 
ce9 
c03 
c80 
c3c 
c19 
c00 
c0f 
c85 
c55 
c1c 
c00 
c00 
cc0 
ce8 
c04 
c49 
c8b 
c8c 
cd4 
c40 
cfd 
cff 
cff 
c49 
c89 
cc7 
c41 
c83 
ce7 
c0f 
c<4a> 
c8d 
cbc 
cfd 
c18 
cfd 
cff 
cff 
c48 
c89 
cf8 
c48 
cc1 
ce8 
c03 
c80 
c3c 
c18 
c00 
c0f 
c85 
c