INFO: task syz-executor5:4233 blocked for more than 140 seconds.
      Not tainted 4.9.135+ #117
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5   D29032  4233   2100 0x80000002
 ffff8801caa32f80 ffff8801c8316e00 ffff8801a9622680 ffff8801ce7717c0
 ffff8801db721018 ffff8801a9337808 ffffffff82806912 0000000000000000
 ffff8801caa33830 ffffed0039546705 00ff8801caa32f80 ffff8801db7218f0
Call Trace:
 [<ffffffff82807e3f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff828087c3>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff8280a83d>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff8280a83d>] mutex_lock_nested+0x38d/0x900 kernel/locking/mutex.c:621
 [<ffffffff82053bf2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
 [<ffffffff81502a67>] filp_close+0xa7/0x140 fs/open.c:1129
 [<ffffffff8156b8d1>] close_files fs/file.c:406 [inline]
 [<ffffffff8156b8d1>] put_files_struct+0x151/0x250 fs/file.c:434
 [<ffffffff8156baf3>] exit_files+0x83/0xb0 fs/file.c:463
 [<ffffffff810e6a1f>] do_exit+0x75f/0x29d0 kernel/exit.c:828
 [<ffffffff810ed121>] do_group_exit+0x111/0x300 kernel/exit.c:937
 [<ffffffff8110e8c1>] get_signal+0x4e1/0x1460 kernel/signal.c:2321
 [<ffffffff81052a55>] do_signal+0x95/0x1b00 arch/x86/kernel/signal.c:807
 [<ffffffff81003e2e>] exit_to_usermode_loop+0x10e/0x150 arch/x86/entry/common.c:158
 [<ffffffff81005932>] prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 [<ffffffff81005932>] syscall_return_slowpath arch/x86/entry/common.c:263 [inline]
 [<ffffffff81005932>] do_syscall_64+0x3e2/0x550 arch/x86/entry/common.c:290
 [<ffffffff82816b93>] 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: [<ffffffff8131bb4c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131bb4c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813fe314>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/2024:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82814c62>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81d36fc2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor5/4233:
 #0:  (&evdev->mutex){+.+.+.}, at: [<ffffffff82053bf2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
1 lock held by syz-executor5/10368:
 #0:  (&evdev->mutex){+.+.+.}, at: [<ffffffff82053bf2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
2 locks held by syz-executor1/12332:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82814c62>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&tty->atomic_write_lock){+.+.+.}, at: [<ffffffff81d1f441>] tty_write_lock+0x21/0x60 drivers/tty/tty_io.c:1107
1 lock held by syz-executor5/12780:
 #0:  (&evdev->mutex){+.+.+.}, at: [<ffffffff82053bf2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
1 lock held by syz-executor5/12784:
 #0:  (&evdev->mutex){+.+.+.}, at: [<ffffffff82053bf2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
1 lock held by syz-executor5/12794:
 #0:  (&evdev->mutex){+.+.+.}, at: [<ffffffff82053bf2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.135+ #117
 ffff8801d9907d08 ffffffff81b42b89 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff81098330 ffff8801d9907d40
 ffffffff81b4dc99 0000000000000001 0000000000000000 0000000000000004
Call Trace:
 [<ffffffff81b42b89>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b42b89>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81b4dc99>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81b4dc2c>] 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
 [<ffffffff8131c0dd>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8131c0dd>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8131c0dd>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8131c0dd>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff811428dd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff82816d5c>] 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: 11358 Comm: syz-executor2 Not tainted 4.9.135+ #117
task: ffff8801d6ce97c0 task.stack: ffff8801d65d8000
RIP: 0033:[<00000000004015bb>] 
c [<00000000004015bb>] 0x4015bb
RSP: 002b:00007f52b8769690  EFLAGS: 00000202
RAX: 0000000061c6b075 RBX: 000000000000000b RCX: 0000000000457569
RDX: 0000000000000000 RSI: 00007f52b87696c0 RDI: 000000000000000b
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f52b876a700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002086e000 CR3: 00000001cb73b000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400