ion_ioctl: ioctl validate failed
INFO: task syz-executor1:13507 blocked for more than 140 seconds.
      Not tainted 4.9.125+ #89
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1   D29688 13507   2103 0x00000004
 ffff8801d4308000 ffff8801d1b3b700 ffff8801d1b3b700 ffff8801c0df0000
 ffff8801db721018 ffff8801ca39fcf8 ffffffff8277d092 0000000000000000
 ffff8801d43088b0 ffffed003a861115 00ff8801d4308000 ffff8801db7218f0
Call Trace:
 [<ffffffff8277e5bf>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff8277ef43>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff82780bc6>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff82780bc6>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff81fe8522>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
 [<ffffffff814e2ed7>] filp_close+0xa7/0x140 fs/open.c:1129
 [<ffffffff8154bcc6>] __close_fd+0x156/0x230 fs/file.c:651
 [<ffffffff814e2fbc>] SYSC_close fs/open.c:1148 [inline]
 [<ffffffff814e2fbc>] SyS_close+0x4c/0x90 fs/open.c:1146
 [<ffffffff8100554f>] do_syscall_64+0x19f/0x480 arch/x86/entry/common.c:282
 [<ffffffff8278c193>] 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: [<ffffffff81309abc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81309abc>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813e68fc>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/2028:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff8278a262>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81cdd442>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor1/13507:
 #0:  (&evdev->mutex){+.+.+.}, at: [<ffffffff81fe8522>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350

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

NMI backtrace for cpu 0
CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.125+ #89
 ffff8801d9907d08 ffffffff81af0ae9 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810967d0 ffff8801d9907d40
 ffffffff81afb849 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81af0ae9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81af0ae9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81afb849>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81afb7dc>] 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
 [<ffffffff8130a04d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8130a04d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8130a04d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8130a04d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff8113d9ad>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8278c35c>] 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: 6700 Comm: syz-executor4 Not tainted 4.9.125+ #89
task: ffff8801d1f68000 task.stack: ffff8801a68f0000
RIP: 0010:[<ffffffff811febea>] 
c [<ffffffff811febea>] trace_hardirqs_on_caller+0x1fa/0x590 kernel/locking/lockdep.c:2735
RSP: 0018:ffff8801a68f7ed0  EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffff8801d1f68000 RCX: 0000000000000000
RDX: ffff8801d1f688ac RSI: ffffffff810053cb RDI: ffff8801d1f688ac
RBP: ffff8801a68f7ee0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff810053f8
R13: ffff8801a68f7fd0 R14: ffff8801d1f68000 R15: 0000000000000000
FS:  00007fe83f841700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff212f40140 CR3: 00000001cbe4d000 CR4: 00000000001606b0
Stack:
 ffff8801a68f7f58
c 00000000000000ca
c ffff8801a68f7ef0
c ffffffff811fef8d
c
 ffff8801a68f7f48
c ffffffff810053f8
c 0000000000000000
c 0000000000000000
c
 0000000000000000
c 0000000000000000
c 0000000000000000
c 0000000000000000
c
Call Trace:
 [<ffffffff811fef8d>] trace_hardirqs_on+0xd/0x10 kernel/locking/lockdep.c:2743
 [<ffffffff810053f8>] do_syscall_64+0x48/0x480 arch/x86/entry/common.c:270
 [<ffffffff8278c193>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
c8b 
c8b 
c7c 
c08 
c00 
c00 
c85 
cc9 
c0f 
c85 
cb8 
c01 
c00 
c00 
c65 
c48 
c8b 
c1c 
c25 
c00 
c7e 
c01 
c00 
c48 
c8d 
cbb 
cac 
c08 
c00 
c00 
c48 
cb8 
c00 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
c48 
c89 
cfa 
c<48> 
cc1 
cea 
c03 
c0f 
cb6 
c14 
c02 
c48 
c89 
cf8 
c83 
ce0 
c07 
c83 
cc0 
c03 
c38 
cd0 
c7c 
c08 
c