INFO: task syz-executor1:6811 blocked for more than 140 seconds.
      Not tainted 4.9.124-g09eb2ba #83
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1   D29088  6811   3843 0x00000000
 ffff8801cf6ac800 ffff8801d8010540 ffff8801d8010540 ffff8801d3a38000
 ffff8801db221c18 ffff8801d5ef7cf8 ffffffff839f0afd ffff8801cf6ad0c8
 ffffed0039ed5a18 ffff8801cf6ac800 00fffc0000000000 ffff8801db2224e8
Call Trace:
 [<ffffffff839f20ff>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff839f2a83>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff839f6f06>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff839f6f06>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff82b55962>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
 [<ffffffff8156d315>] filp_close+0xa5/0x140 fs/open.c:1129
 [<ffffffff815dc396>] __close_fd+0x156/0x230 fs/file.c:651
 [<ffffffff8156d3fc>] SYSC_close fs/open.c:1148 [inline]
 [<ffffffff8156d3fc>] SyS_close+0x4c/0x90 fs/open.c:1146
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff83a019d3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/519:
 #0:  (rcu_read_lock){......}, at: [<ffffffff813689dc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813689dc>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81428248>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3666:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815dc7ec>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3762:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839ffba2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff82125402>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor1/6811:
 #0:  (&evdev->mutex){+.+...}, at: [<ffffffff82b55962>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
1 lock held by syz-executor1/6818:
 #0:  (&evdev->mutex){+.+...}, at: [<ffffffff82b58542>] evdev_ioctl_handler+0x112/0x1820 drivers/input/evdev.c:1293
1 lock held by syz-executor1/6873:
 #0:  (&evdev->mutex){+.+...}, at: [<ffffffff82b575eb>] evdev_open_device drivers/input/evdev.c:423 [inline]
 #0:  (&evdev->mutex){+.+...}, at: [<ffffffff82b575eb>] evdev_open+0x1db/0x430 drivers/input/evdev.c:516
1 lock held by syz-executor1/6900:
 #0:  (&evdev->mutex){+.+...}, at: [<ffffffff82b58542>] evdev_ioctl_handler+0x112/0x1820 drivers/input/evdev.c:1293
1 lock held by syz-executor1/6874:
 #0:  (&evdev->mutex){+.+...}, at: [<ffffffff82b55962>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
1 lock held by syz-executor1/6903:
 #0:  (&evdev->mutex){+.+...}, at: [<ffffffff82b55962>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350

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

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.124-g09eb2ba #83
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8637d08 ffffffff81eb95e9 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b9fa0 ffff8801d8637d40
 ffffffff81ec4927 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb95e9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb95e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ec4927>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ec48ba>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810ba0a4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81368f74>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81368f74>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81368f74>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81368f74>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119f3cd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff83a01b9c>] 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 skipped: idling at pc 0xffffffff83a00606