INFO: task syz-executor4:8881 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-executor4   D28856  8881   2089 0x00000000
 ffff88019d542f80 ffff8801d488dd80 ffff8801d488dd80 ffff88019d9c0000
 ffff8801db721018 ffff88019daef818 ffffffff8277ee02 0000000000000000
 ffff88019d543830 ffffed0033aa8705 00ff88019d542f80 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
 [<ffffffff8154b361>] close_files fs/file.c:406 [inline]
 [<ffffffff8154b361>] put_files_struct+0x151/0x250 fs/file.c:434
 [<ffffffff8154b583>] exit_files+0x83/0xb0 fs/file.c:463
 [<ffffffff810e3ff9>] do_exit+0x759/0x2750 kernel/exit.c:828
 [<ffffffff810ea481>] do_group_exit+0x111/0x300 kernel/exit.c:937
 [<ffffffff8110b411>] get_signal+0x4e1/0x1460 kernel/signal.c:2321
 [<ffffffff81051225>] do_signal+0x95/0x1b00 arch/x86/kernel/signal.c:807
 [<ffffffff81003e2e>] exit_to_usermode_loop+0x10e/0x150 arch/x86/entry/common.c:157
 [<ffffffff8100570d>] prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline]
 [<ffffffff8100570d>] syscall_return_slowpath arch/x86/entry/common.c:260 [inline]
 [<ffffffff8100570d>] do_syscall_64+0x35d/0x480 arch/x86/entry/common.c:287
 [<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
1 lock held by rsyslogd/1889:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8154c6fc>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/2016:
 #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-executor4/8881:
 #0:  (&evdev->mutex){+.+.+.}, at: [<ffffffff81fea2b2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
1 lock held by syz-executor4/8897:
 #0:  (&evdev->mutex){+.+.+.}, at: [<ffffffff81fea2b2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
1 lock held by syz-executor4/13486:
 #0:  (&evdev->mutex){+.+.+.}, at: [<ffffffff81fea2b2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.128+ #93
 ffff8801d9907d08 ffffffff81af2469 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810967d0 ffff8801d9907d40
 ffffffff81afd1c9 0000000000000001 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 13637 Comm: init Not tainted 4.9.128+ #93
task: ffff8801c771df00 task.stack: ffff8801c71d0000
RIP: 0010:[<ffffffff81d09b9b>] 
c [<ffffffff81d09b9b>] inb arch/x86/include/asm/io.h:316 [inline]
RIP: 0010:[<ffffffff81d09b9b>] 
c [<ffffffff81d09b9b>] io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:413
RSP: 0018:ffff8801c71d7538  EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: ffffffff81d09b41 RDI: ffffffff84959a18
RBP: ffff8801c71d7548 R08: ffff8801c771e820 R09: ce7c7de6d0df4a7d
R10: ffff8801c771df00 R11: 0000000000000001 R12: ffffffff849599e0
R13: 0000000000000020 R14: fffffbfff092b383 R15: fffffbfff092b345
FS:  00007fa1816837a0(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe0ed2a0000 CR3: 00000001d7bf7000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff849599e0
c 0000000000002708
c ffff8801c71d7598
c ffffffff81d0bdb4
c
 ffff8801c71d75d0
c ffffffff84959a28
c ffffffff84959c1a
c ffffffff849599e0
c
 0000000000000034
c ffffffff81d0bf00
c dffffc0000000000
c 0000000000000034
c
Call Trace:
 [<ffffffff81d0bdb4>] serial_in drivers/tty/serial/8250/8250.h:111 [inline]
 [<ffffffff81d0bdb4>] wait_for_xmitr+0x94/0x1e0 drivers/tty/serial/8250/8250_port.c:1997
 [<ffffffff81d0bf1f>] serial8250_console_putchar+0x1f/0x60 drivers/tty/serial/8250/8250_port.c:3103
 [<ffffffff81cf4599>] uart_console_write+0x59/0xf0 drivers/tty/serial/serial_core.c:1866
 [<ffffffff81d17138>] serial8250_console_write+0x528/0x820 drivers/tty/serial/8250/8250_port.c:3169
 [<ffffffff81d04daf>] univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:594
 [<ffffffff8121b4bd>] call_console_drivers.isra.0.constprop.15+0x1ad/0x360 kernel/printk/printk.c:1589
 [<ffffffff8121e1ef>] console_unlock+0x47f/0xb50 kernel/printk/printk.c:2449
 [<ffffffff8121f5f7>] console_device+0x97/0xc0 kernel/printk/printk.c:2557
 [<ffffffff81cd3925>] tty_lookup_driver drivers/tty/tty_io.c:2003 [inline]
 [<ffffffff81cd3925>] tty_open_by_driver drivers/tty/tty_io.c:2048 [inline]
 [<ffffffff81cd3925>] tty_open+0x6f5/0xdf0 drivers/tty/tty_io.c:2125
 [<ffffffff814f839d>] chrdev_open+0x22d/0x4c0 fs/char_dev.c:392
 [<ffffffff814e284f>] do_dentry_open+0x3ef/0xc90 fs/open.c:766
 [<ffffffff814e617c>] vfs_open+0x11c/0x210 fs/open.c:879
 [<ffffffff8151cde2>] do_last fs/namei.c:3410 [inline]
 [<ffffffff8151cde2>] path_openat+0x542/0x2790 fs/namei.c:3534
 [<ffffffff81521eb7>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff814e6b8d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff814e6e6d>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff814e6e6d>] SyS_open+0x2d/0x40 fs/open.c:1085
 [<ffffffff8100554f>] do_syscall_64+0x19f/0x480 arch/x86/entry/common.c:282
 [<ffffffff8278df13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
c24 
cc9 
c00 
c00 
c00 
c49 
c8d 
c7c 
c24 
c38 
c48 
cb8 
c00 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
c48 
c89 
cfa 
c48 
cc1 
cea 
c03 
cd3 
ce3 
c80 
c3c 
c02 
c00 
c75 
c17 
c41 
c03 
c5c 
c24 
c38 
c89 
cda 
cec 
c<5b> 
c0f 
cb6 
cc0 
c41 
c5c 
c5d 
cc3 
ce8 
cf8 
c9f 
c7c 
cff 
ceb 
cc2 
ce8 
c51 
ca0 
c7c 
cff 
ceb 
c