INFO: task syz-executor2:17924 blocked for more than 140 seconds.
      Not tainted 4.9.133+ #105
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor2   D28824 17924   2087 0x00000004
 ffff8801c8595f00 ffff8801d144f900 ffff8801aad8c780 ffff8801cefec740
 ffff8801db721018 ffff8801cef6fcf8 ffffffff827f3aa2 0000000000000000
 ffff8801c85967b0 ffffed00390b2cf5 00ff8801c8595f00 ffff8801db7218f0
Call Trace:
 [<ffffffff827f4fcf>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff827f5953>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff827f79cd>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff827f79cd>] mutex_lock_nested+0x38d/0x900 kernel/locking/mutex.c:621
 [<ffffffff82047f32>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
 [<ffffffff81502ac7>] filp_close+0xa7/0x140 fs/open.c:1129
 [<ffffffff8156c876>] __close_fd+0x156/0x230 fs/file.c:651
 [<ffffffff81502bac>] SYSC_close fs/open.c:1148 [inline]
 [<ffffffff81502bac>] SyS_close+0x4c/0x90 fs/open.c:1146
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82803d13>] 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: [<ffffffff8131baec>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131baec>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813fe2b4>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/2019:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82801df2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81d2b472>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor2/17924:
 #0:  (&evdev->mutex){+.+.+.}, at: [<ffffffff82047f32>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350

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

NMI backtrace for cpu 0
CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.133+ #105
 ffff8801d9907d08 ffffffff81b37069 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff81098330 ffff8801d9907d40
 ffffffff81b42179 0000000000000000 0000000000000000 0000000000000004
Call Trace:
 [<ffffffff81b37069>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b37069>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81b42179>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81b4210c>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff81098434>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8131c07d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8131c07d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8131c07d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8131c07d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff811428dd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff82803edc>] 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: 3949 Comm: syz-executor3 Not tainted 4.9.133+ #105
task: ffff8801c6b95f00 task.stack: ffff8801ae1d0000
RIP: 0033:[<00000000004015b4>] 
c [<00000000004015b4>] 0x4015b4
RSP: 002b:00007f8022561b50  EFLAGS: 00000282
RAX: 00000000ebd8ffda RBX: 0000000000000ff4 RCX: 0000000000457569
RDX: 0000000000410f61 RSI: 0000000000a44bf0 RDI: 0000000000000043
RBP: 00000000004bc231 R08: 000000000000000e R09: 0000000000000000
R10: 00007f8022562700 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000004c3023 R14: 00000000004d50d0 R15: 00000000ffffffff
FS:  00007f8022562700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020b91000 CR3: 00000001c6b03000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400