INFO: task syz-executor0:7655 blocked for more than 120 seconds.
      Not tainted 4.4.112-g5f6325b #21
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D ffff8801d4b2f458 26424  7655   4856 0x20020004
 ffff8801d4b2f458 0000000000000024 e9298dedb8f1d678 ffff8801d4b2f500
 ffff8801d4b2f630 ffff8801d9c12c00 ffff8801db31fdb8 ffff8801db31fde0
 ffff8801db31f4d8 ffff8800b701c740 ffff8800b7bb2f80 ffff8801d4b28000
Call Trace:
 [<ffffffff837683ba>] schedule+0x9a/0x1c0 kernel/sched/core.c:3351
 [<ffffffff83773701>] schedule_timeout+0x3a1/0x970 kernel/time/timer.c:1508
 [<ffffffff8376633e>] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:4932
 [<ffffffff8376966b>] io_schedule include/linux/sched.h:447 [inline]
 [<ffffffff8376966b>] bit_wait_io+0x1b/0xc0 kernel/sched/wait.c:595
 [<ffffffff837691af>] __wait_on_bit_lock+0x8f/0x140 kernel/sched/wait.c:434
 [<ffffffff8141d0ed>] __lock_page+0x18d/0x1f0 mm/filemap.c:888
 [<ffffffff815b96d0>] lock_page include/linux/pagemap.h:458 [inline]
 [<ffffffff815b96d0>] __generic_file_splice_read+0x730/0xb00 fs/splice.c:412
 [<ffffffff815b9b82>] generic_file_splice_read+0xe2/0x1c0 fs/splice.c:542
 [<ffffffff815b5e85>] do_splice_to+0xf5/0x140 fs/splice.c:1154
 [<ffffffff815b6120>] splice_direct_to_actor+0x250/0x830 fs/splice.c:1226
 [<ffffffff815b68a7>] do_splice_direct+0x1a7/0x270 fs/splice.c:1337
 [<ffffffff8152086c>] do_sendfile+0x54c/0xd30 fs/read_write.c:1227
 [<ffffffff81522a41>] C_SYSC_sendfile fs/read_write.c:1303 [inline]
 [<ffffffff81522a41>] compat_SyS_sendfile+0xd1/0x160 fs/read_write.c:1292
 [<ffffffff81006d84>] do_syscall_32_irqs_on arch/x86/entry/common.c:390 [inline]
 [<ffffffff81006d84>] do_fast_syscall_32+0x314/0x890 arch/x86/entry/common.c:457
 [<ffffffff83777e2a>] sysenter_flags_fixed+0xd/0x17
no locks held by syz-executor0/7655.
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 486 Comm: khungtaskd Not tainted 4.4.112-g5f6325b #21
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800bb2e5f00 task.stack: ffff8800bb2a8000
RIP: 0010:[<ffffffff810c3e87>]  [<ffffffff810c3e87>] native_apic_mem_write arch/x86/include/asm/apic.h:94 [inline]
RIP: 0010:[<ffffffff810c3e87>]  [<ffffffff810c3e87>] __default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline]
RIP: 0010:[<ffffffff810c3e87>]  [<ffffffff810c3e87>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:61 [inline]
RIP: 0010:[<ffffffff810c3e87>]  [<ffffffff810c3e87>] flat_send_IPI_mask+0xf7/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800bb2afcb8  EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300
RBP: ffff8800bb2afce0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000000000003 R14: ffffffff8426ec20 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f668cde49b8 CR3: 00000001d9388000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8426ec20 ffffffff847ee680 000000000001bca0 0000000000000040
 dffffc0000000000 ffff8800bb2afd00 ffffffff810b99bb ffffffff839f59a0
 0000000000000003 ffff8800bb2afd60 ffffffff81d106f7 0000000000000000
Call Trace:
 [<ffffffff810b99bb>] nmi_raise_cpu_backtrace+0x5b/0x70 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81d106f7>] nmi_trigger_all_cpu_backtrace+0x4a7/0x550 lib/nmi_backtrace.c:85
 [<ffffffff810b9a54>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff81367e3a>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff81367e3a>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81367e3a>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81367e3a>] watchdog+0x6fa/0xae0 kernel/hung_task.c:238
 [<ffffffff81190958>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff8377689f>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:494
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 db 1f 17 00 4c 89 e7 57 9d 0f 1f 
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.112-g5f6325b #21
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801da3a97c0 task.stack: ffff8801da3b8000
RIP: 0010:[<ffffffff811a4830>]  [<ffffffff811a4830>] preempt_count_sub+0x0/0x160 kernel/sched/core.c:2638
RSP: 0018:ffff8801da3bfc90  EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000096 RCX: 0000000000000000
RDX: 1ffff1003b4753ff RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffff8801da3bfca8 R08: 1ffff1003b43760a R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff1003b477f42 R12: ffff8801db319640
R13: ffff8801db319c70 R14: 0000000000000001 R15: ffff8801db319640
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f19f4bfc000 CR3: 00000001d9388000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff83775a55 1ffff1003b477f99 ffff8801db319700 ffff8801da3bfd50
 ffffffff812ac299 ffff8801db31fe88 ffff8801db319700 0000000041b58ab3
 ffffffff83fa8e5b ffffffff812abf90 000000000000000f 0000000000000096
Call Trace:
 [<ffffffff812ac299>] unlock_hrtimer_base kernel/time/hrtimer.c:818 [inline]
 [<ffffffff812ac299>] hrtimer_try_to_cancel+0x309/0x660 kernel/time/hrtimer.c:1059
 [<ffffffff812ac612>] hrtimer_cancel+0x22/0x40 kernel/time/hrtimer.c:1077
 [<ffffffff812d48fe>] tick_nohz_restart+0x1e/0x190 kernel/time/tick-sched.c:559
 [<ffffffff812d6957>] tick_nohz_restart_sched_tick kernel/time/tick-sched.c:726 [inline]
 [<ffffffff812d6957>] tick_nohz_idle_exit+0x247/0x3d0 kernel/time/tick-sched.c:946
 [<ffffffff81220967>] cpu_idle_loop kernel/sched/idle.c:267 [inline]
 [<ffffffff81220967>] cpu_startup_entry+0x2e7/0x820 kernel/sched/idle.c:301
 [<ffffffff810adc64>] start_secondary+0x304/0x3e0 arch/x86/kernel/smpboot.c:242
Code: f7 e8 45 98 35 00 e9 af fb ff ff 48 89 45 d0 e8 37 98 35 00 48 8b 45 d0 e9 73 fb ff ff 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 <48> b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 89 fb 48 c7 c7 00