INFO: task syz-executor2:28520 blocked for more than 140 seconds.
      Not tainted 4.4.155+ #98
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor2   D ffff8800a383fd58 29312 28520   2104 0x00000004
 ffff8800a383fd58 0000000000000000 ffff8801d6bd3848 ffffed003ad7a708
 ffff8801d6bd2f00 ffff8801db71f180 ffff8801db71f1a8 ffff8801db71e898
 ffff8801db71e880 ffff8801d4700000 ffff8801d6bd2f80 0000000000000000
Call Trace:
 [<ffffffff8268424a>] schedule+0x7a/0x1b0 kernel/sched/core.c:3355
 [<ffffffff826849e3>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3388
 [<ffffffff82686707>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff82686707>] mutex_lock_nested+0x307/0x840 kernel/locking/mutex.c:621
 [<ffffffff81f22c72>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
 [<ffffffff8146e887>] filp_close+0xa7/0x140 fs/open.c:1095
 [<ffffffff814ce131>] __close_fd+0x1a1/0x2b0 fs/file.c:650
 [<ffffffff8146e96c>] SYSC_close fs/open.c:1114 [inline]
 [<ffffffff8146e96c>] SyS_close+0x4c/0x90 fs/open.c:1112
 [<ffffffff82690be1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
1 lock held by syz-executor2/28520:
 #0:  (&evdev->mutex){+.+.+.}, at: [<ffffffff81f22c72>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 20 Comm: khungtaskd Not tainted 4.4.155+ #98
task: ffff8801da6f2f80 task.stack: ffff8801d9ee8000
RIP: 0010:[<ffffffff8109a2a6>]  [<ffffffff8109a2a6>] native_apic_mem_write arch/x86/include/asm/apic.h:93 [inline]
RIP: 0010:[<ffffffff8109a2a6>]  [<ffffffff8109a2a6>] __default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline]
RIP: 0010:[<ffffffff8109a2a6>]  [<ffffffff8109a2a6>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:61 [inline]
RIP: 0010:[<ffffffff8109a2a6>]  [<ffffffff8109a2a6>] flat_send_IPI_mask+0xf6/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8801d9eefcc8  EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fc300
RBP: ffff8801d9eefcf0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000003000000 R14: ffffffff82e5f3a0 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020533000 CR3: 00000001d7369000 CR4: 00000000001606b0
Stack:
 ffffffff82e5f3a0 ffffffff831a3020 0000000000000007 fffffbfff06344e4
 0000000000000008 ffff8801d9eefd10 ffffffff81091931 ffffffff82920960
 0000000000000003 ffff8801d9eefd68 ffffffff81a60182 ffffffff813918e5
Call Trace:
 [<ffffffff81091931>] nmi_raise_cpu_backtrace+0x61/0x80 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81a60182>] nmi_trigger_all_cpu_backtrace.cold.0+0x70/0xae lib/nmi_backtrace.c:85
 [<ffffffff810919d4>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff8139b2a7>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff8139b2a7>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8139b2a7>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8139b2a7>] watchdog.cold.0+0xd3/0xee kernel/hung_task.c:238
 [<ffffffff8112f2e8>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff82690fc5>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:510
Code: 00 c3 5f ff 80 e6 10 75 e1 41 c1 e5 18 44 89 2c 25 10 c3 5f ff 44 89 fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 c3 5f ff <41> f7 c4 00 02 00 00 75 1a 4c 89 e7 57 9d 0f 1f 44 00 00 e8 62 
NMI backtrace for cpu 1
CPU: 1 PID: 12379 Comm: syz-executor4 Not tainted 4.4.155+ #98
task: ffff8801d4700000 task.stack: ffff8801d33f8000
RIP: 0010:[<ffffffff82690b50>]  [<ffffffff82690b50>] entry_SYSCALL_64+0x0/0x26 arch/x86/entry/entry_64.S:54
RSP: 0018:00007f352013ccf8  EFLAGS: 00000046
RAX: 00000000000000ca RBX: 00000000009300a8 RCX: 00000000004572a9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000009300a8
RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000009300ac
R13: 0000000000a3fb9f R14: 00007f352013d9c0 R15: 0000000000000000
FS:  00007f352013d700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f055d2709de CR3: 00000000ba815000 CR4: 00000000001606b0
Stack:
 00000000004083f7 0000000000000000 0000000000000000 0000000000000000
 000000000040df75 0000000000000000 00007f352013d700 00007f352013d700
 74c75e9af19de7b5 0000000000000000 0000000000a3fb9f 00007f352013d9c0
Call Trace:
 <UNK> 
dCode: df e8 c5 fe ff ff e8 90 41 c6 fe 5b 5d c3 e8 d8 0f dd fe eb db 90 90 90 90 90 90 0f 01 f8 48 0f 07 66 2e 0f 1f 84 00 00 00 00 00 <0f> 01 f8 eb 21 90 90 90 90 90 90 90 0f 20 d8 48 25 00 e0 ff ff