INFO: task syz-executor2:16813 blocked for more than 120 seconds.
      Not tainted 4.4.105-ge303a83 #5
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor2   D ffff8800b54af4d8 26440 16813   3543 0x00000004
 ffff8800b54af4d8 000000000000002a 0000000000005730 0000000041b58ab3
 ffffffff83fad850 ffffffff8122ab00 ffff8801db51f838 ffff8801db51f860
 ffff8801db51ef58 ffff8800bb218000 ffff8800b54b0000 ffff8800b54a8000
Call Trace:
 [<ffffffff8373c3aa>] schedule+0x9a/0x1c0 kernel/sched/core.c:3351
 [<ffffffff8374768c>] schedule_timeout+0x3fc/0xb80 kernel/time/timer.c:1508
 [<ffffffff8373a32e>] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:4932
 [<ffffffff8373d65b>] io_schedule include/linux/sched.h:446 [inline]
 [<ffffffff8373d65b>] bit_wait_io+0x1b/0xc0 kernel/sched/wait.c:595
 [<ffffffff8373d19f>] __wait_on_bit_lock+0x8f/0x140 kernel/sched/wait.c:434
 [<ffffffff813ff6bf>] __lock_page+0x18f/0x1f0 mm/filemap.c:888
 [<ffffffff8158fc8a>] lock_page include/linux/pagemap.h:458 [inline]
 [<ffffffff8158fc8a>] __generic_file_splice_read+0x76a/0xb60 fs/splice.c:412
 [<ffffffff8159013c>] generic_file_splice_read+0xbc/0x210 fs/splice.c:542
 [<ffffffff8158c544>] do_splice_to+0xd4/0x120 fs/splice.c:1154
 [<ffffffff8158c7cc>] splice_direct_to_actor+0x23c/0x820 fs/splice.c:1226
 [<ffffffff8158cefc>] do_splice_direct+0x14c/0x270 fs/splice.c:1337
 [<ffffffff814fa854>] do_sendfile+0x4d4/0xf40 fs/read_write.c:1227
 [<ffffffff814fcb10>] SYSC_sendfile64 fs/read_write.c:1282 [inline]
 [<ffffffff814fcb10>] SyS_sendfile64+0xb0/0x130 fs/read_write.c:1274
 [<ffffffff8374ab36>] entry_SYSCALL_64_fastpath+0x16/0x76
no locks held by syz-executor2/16813.
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.105-ge303a83 #5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffffffff84214840 task.stack: ffffffff84200000
RIP: 0010:[<ffffffff81275236>]  [<ffffffff81275236>] debug_lockdep_rcu_enabled.part.4+0x26/0x60 kernel/rcu/update.c:243
RSP: 0018:ffffffff84207b78  EFLAGS: 00000803
RAX: dffffc0000000000 RBX: ffffffff84214840 RCX: ffff8800b9313048
RDX: 1ffffffff0842a15 RSI: ffff8801db41ef58 RDI: ffffffff842150ac
RBP: ffffffff84207b80 R08: ffff8800b9313060 R09: ffff8801db41ef40
R10: dffffc0000000000 R11: 1ffffffff0840f72 R12: ffffffff83843460
R13: 0000003843fd71a4 R14: 0000000000000000 R15: ffff8801db41ef40
FS:  0000000000000000(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c4222e8a38 CR3: 00000001d486e000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8800b9312fe0 ffffffff84207b90 ffffffff812752e7 ffffffff84207bf0
 ffffffff811d83d5 ffffffff8122ab40 ffff8801db41f0b0 ffff8800b9313048
 ffff8800b9313060 ffff8800b9313048 ffff8800b9312fe0 ffff8801db41efe8
Call Trace:
 [<ffffffff812752e7>] debug_lockdep_rcu_enabled+0x77/0x90 kernel/rcu/update.c:242
 [<ffffffff811d83d5>] trace_sched_stat_wait include/trace/events/sched.h:374 [inline]
 [<ffffffff811d83d5>] update_stats_wait_end+0x4c5/0xa30 kernel/sched/fair.c:923
 [<ffffffff811d8bbd>] set_next_entity+0x27d/0x3d0 kernel/sched/fair.c:3686
 [<ffffffff811f5811>] pick_next_task_fair+0xb11/0x2220 kernel/sched/fair.c:7074
 [<ffffffff8373b115>] pick_next_task kernel/sched/core.c:3187 [inline]
 [<ffffffff8373b115>] __schedule+0xc15/0x1c70 kernel/sched/core.c:3304
 [<ffffffff8373c3aa>] schedule+0x9a/0x1c0 kernel/sched/core.c:3351
 [<ffffffff8373cb83>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3384
 [<ffffffff81215022>] cpu_idle_loop kernel/sched/idle.c:279 [inline]
 [<ffffffff81215022>] cpu_startup_entry+0x302/0x820 kernel/sched/idle.c:301
 [<ffffffff83737772>] rest_init+0x152/0x160 init/main.c:409
 [<ffffffff848195c7>] start_kernel+0x638/0x66d init/main.c:680
 [<ffffffff84818312>] x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:196
 [<ffffffff84818454>] x86_64_start_kernel+0x140/0x163 arch/x86/kernel/head64.c:185
Code: 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 65 48 8b 1c 25 00 3f 01 00 48 8d bb 6c 08 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 10 
NMI backtrace for cpu 1
CPU: 1 PID: 483 Comm: khungtaskd Not tainted 4.4.105-ge303a83 #5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d99b17c0 task.stack: ffff8800bb040000
RIP: 0010:[<ffffffff810c0777>]  [<ffffffff810c0777>] native_apic_mem_write arch/x86/include/asm/apic.h:94 [inline]
RIP: 0010:[<ffffffff810c0777>]  [<ffffffff810c0777>] __default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline]
RIP: 0010:[<ffffffff810c0777>]  [<ffffffff810c0777>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:61 [inline]
RIP: 0010:[<ffffffff810c0777>]  [<ffffffff810c0777>] flat_send_IPI_mask+0xf7/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800bb047cb8  EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300
RBP: ffff8800bb047ce0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000000000003 R14: ffffffff8426ace0 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c4222e9fa8 CR3: 00000001d486e000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8426ace0 ffffffff847e73c0 ffffffff847e4964 0000000000000001
 dffffc0000000000 ffff8800bb047d00 ffffffff810b62ab fffffbfff08fc92c
 0000000000019460 ffff8800bb047d68 ffffffff81cd3e78 0000000000000000
Call Trace:
 [<ffffffff810b62ab>] nmi_raise_cpu_backtrace+0x5b/0x70 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81cd3e78>] nmi_trigger_all_cpu_backtrace+0x428/0x590 lib/nmi_backtrace.c:85
 [<ffffffff810b6344>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff8134e976>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff8134e976>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8134e976>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8134e976>] watchdog+0x636/0xa20 kernel/hung_task.c:238
 [<ffffffff81185b45>] kthread+0x245/0x310 kernel/kthread.c:211
 [<ffffffff8374aeef>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:468
Code: b3 5f ff f6 c4 10 75 e1 44 89 e8 c1 e0 18 89 04 25 10 b3 5f ff 44 89 fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 b3 5f ff <41> f7 c4 00 02 00 00 74 1a e8 8b 9d 16 00 4c 89 e7 57 9d 0f 1f