INFO: task syz-executor3:8530 blocked for more than 120 seconds.
      Not tainted 4.4.137-ga2e2217 #59
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3   D ffff8800afc47460 26360  8530   3876 0x20020004
 ffff8800afc47460 0000000000000040 ffff8800a2bfe900 1a727ab2952bdaf1
 ffff8800afc47600 ffff8801db31fdb8 ffff8801db31fde0 ffff8801db31f4d8
 ffff8801db31f4c0 ffff8800b0f18000 ffff8800a2bfe000 0000000000000000
Call Trace:
 [<ffffffff838b489a>] schedule+0x7a/0x1b0 kernel/sched/core.c:3359
 [<ffffffff838bfcb1>] schedule_timeout+0x481/0x8b0 kernel/time/timer.c:1515
 [<ffffffff838b275a>] io_schedule_timeout+0x1ba/0x390 kernel/sched/core.c:4941
 [<ffffffff838b5aeb>] io_schedule include/linux/sched.h:447 [inline]
 [<ffffffff838b5aeb>] bit_wait_io+0x1b/0xd0 kernel/sched/wait.c:595
 [<ffffffff838b5652>] __wait_on_bit_lock.part.4+0x92/0x140 kernel/sched/wait.c:434
 [<ffffffff838b5709>] __wait_on_bit_lock+0x9/0x10 kernel/sched/wait.c:427
 [<ffffffff8141cdfd>] __lock_page+0x17d/0x1f0 mm/filemap.c:888
 [<ffffffff815b9b0b>] lock_page include/linux/pagemap.h:458 [inline]
 [<ffffffff815b9b0b>] __generic_file_splice_read+0x7eb/0xbb0 fs/splice.c:412
 [<ffffffff815b9fb2>] generic_file_splice_read+0xe2/0x1c0 fs/splice.c:542
 [<ffffffff815b6107>] do_splice_to+0xf7/0x140 fs/splice.c:1154
 [<ffffffff815b6392>] splice_direct_to_actor+0x242/0x830 fs/splice.c:1226
 [<ffffffff815b6b23>] do_splice_direct+0x1a3/0x270 fs/splice.c:1337
 [<ffffffff815206c4>] do_sendfile+0x4e4/0xb80 fs/read_write.c:1227
 [<ffffffff81522811>] C_SYSC_sendfile fs/read_write.c:1303 [inline]
 [<ffffffff81522811>] compat_SyS_sendfile+0xd1/0x160 fs/read_write.c:1292
 [<ffffffff81006d96>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff81006d96>] do_fast_syscall_32+0x326/0x8b0 arch/x86/entry/common.c:459
 [<ffffffff838c422a>] sysenter_flags_fixed+0xd/0x17
no locks held by syz-executor3/8530.
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 491 Comm: khungtaskd Not tainted 4.4.137-ga2e2217 #59
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9380000 task.stack: ffff8801d9060000
RIP: 0010:[<ffffffff810bfeb6>]  [<ffffffff810bfeb6>] native_apic_mem_write arch/x86/include/asm/apic.h:94 [inline]
RIP: 0010:[<ffffffff810bfeb6>]  [<ffffffff810bfeb6>] __default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline]
RIP: 0010:[<ffffffff810bfeb6>]  [<ffffffff810bfeb6>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:61 [inline]
RIP: 0010:[<ffffffff810bfeb6>]  [<ffffffff810bfeb6>] flat_send_IPI_mask+0xf6/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8801d9067cc8  EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300
RBP: ffff8801d9067cf0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000000000003 R14: 0000000000000002 R15: ffffffff8446f7a0
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9012a92140 CR3: 00000000b0eda000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8446f7a0 ffffffff84a18ee0 0000000000000007 fffffbfff0942c8c
 0000000000000040 ffff8801d9067d10 ffffffff810b5e71 ffffffff83c0b560
 0000000000000003 ffff8801d9067d68 ffffffff81e19e83 ffff8800a2bfe000
Call Trace:
 [<ffffffff810b5e71>] nmi_raise_cpu_backtrace+0x61/0x80 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81e19e83>] nmi_trigger_all_cpu_backtrace.cold.4+0x70/0xad lib/nmi_backtrace.c:85
 [<ffffffff810b5f14>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff8141a459>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff8141a459>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8141a459>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8141a459>] watchdog.cold.1+0xd3/0xee kernel/hung_task.c:238
 [<ffffffff81190958>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff838c2d15>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:510
Code: b3 5f ff f6 c4 10 75 e2 44 89 e8 c1 e0 18 89 04 25 10 b3 5f ff 44 89 f2 09 da 80 cf 04 41 83 fe 02 0f 44 d3 89 14 25 00 b3 5f ff <41> f7 c4 00 02 00 00 75 1a 4c 89 e7 57 9d 0f 1f 44 00 00 e8 72 
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.137-ga2e2217 #59
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9a41800 task.stack: ffff8801d9a50000
RIP: 0010:[<ffffffff813514b1>]  [<ffffffff813514b1>] __sanitizer_cov_trace_pc+0x1/0x50 kernel/kcov.c:93
RSP: 0018:ffff8801d9a57da8  EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff84483be0 RCX: 1ffffffff09429a9
RDX: 0000000000000000 RSI: ffffffff81e6e99b RDI: ffffffff84a14d48
RBP: ffff8801d9a57dd8 R08: ffff8801d9a42100 R09: 0000000000000000
R10: 0000000000000001 R11: ffff8801d9a41800 R12: 0000000000000002
R13: 0000000000000000 R14: fffffbfff074890c R15: ffffffff84a05fa8
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9012a92140 CR3: 00000001ca4c5000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d9a57dd8 ffffffff81195768 ffffffff81195700 0000000000000002
 0000000000000000 0000000000000000 ffff8801d9a57df0 ffffffff8113058e
 dffffc0000000000 ffff8801d9a57e00 ffffffff8102728f ffff8801d9a57ea8
Call Trace:
 [<ffffffff8113058e>] idle_notifier_call_chain+0x1e/0x30 kernel/cpu.c:865
 [<ffffffff8102728f>] __exit_idle arch/x86/kernel/process.c:247 [inline]
 [<ffffffff8102728f>] arch_cpu_idle_exit+0x1f/0x30 arch/x86/kernel/process.c:268
 [<ffffffff8121bf69>] cpu_idle_loop kernel/sched/idle.c:255 [inline]
 [<ffffffff8121bf69>] cpu_startup_entry+0x269/0x780 kernel/sched/idle.c:301
 [<ffffffff810aa1e4>] start_secondary+0x324/0x400 arch/x86/kernel/smpboot.c:242
Code: ff e8 24 84 1a 00 eb 85 4c 89 e7 e8 7a 83 1a 00 eb b7 e8 13 84 1a 00 eb 89 4c 89 e7 e8 69 83 1a 00 e9 14 ff ff ff 0f 1f 40 00 55 <48> 89 e5 65 48 8b 04 25 00 67 01 00 65 8b 15 cc 51 cc 7e 81 e2