INFO: task syz-executor5:8072 blocked for more than 120 seconds.
      Not tainted 4.4.113-g202e079 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5   D ffff8801d929f550 27608  8072   3396 0x20020004
 ffff8801d929f550 ffff8800b9eb0038 ffffe8ffffd01c40 ffff8800b9eb0030
 ffff8801d929f528 ffff8801d929f500 ffff8801db31fdb8 ffff8801db31fde0
 ffff8801db31f4d8 ffff8800b4632f80 ffff8800ba46df00 0000000000000000
Call Trace:
 [<ffffffff83763a1a>] schedule+0x7a/0x1b0 kernel/sched/core.c:3351
 [<ffffffff8376ed31>] schedule_timeout+0x3a1/0x970 kernel/time/timer.c:1508
 [<ffffffff837619de>] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:4932
 [<ffffffff815dc70d>] io_schedule include/linux/sched.h:447 [inline]
 [<ffffffff815dc70d>] dio_await_one fs/direct-io.c:449 [inline]
 [<ffffffff815dc70d>] dio_await_completion fs/direct-io.c:503 [inline]
 [<ffffffff815dc70d>] do_blockdev_direct_IO+0x476d/0x8810 fs/direct-io.c:1313
 [<ffffffff815e085e>] __blockdev_direct_IO+0xae/0xe0 fs/direct-io.c:1342
 [<ffffffff815cf592>] blkdev_direct_IO+0xb2/0xe0 fs/block_dev.c:167
 [<ffffffff81422c90>] generic_file_read_iter+0x360/0x1160 mm/filemap.c:1791
 [<ffffffff815d05f5>] blkdev_read_iter+0x105/0x170 fs/block_dev.c:1679
 [<ffffffff8151bec9>] new_sync_read fs/read_write.c:422 [inline]
 [<ffffffff8151bec9>] __vfs_read+0x339/0x440 fs/read_write.c:434
 [<ffffffff8151db33>] vfs_read+0x123/0x3a0 fs/read_write.c:454
 [<ffffffff81520479>] SYSC_read fs/read_write.c:569 [inline]
 [<ffffffff81520479>] SyS_read+0xd9/0x1b0 fs/read_write.c:562
 [<ffffffff81006d74>] do_syscall_32_irqs_on arch/x86/entry/common.c:390 [inline]
 [<ffffffff81006d74>] do_fast_syscall_32+0x314/0x890 arch/x86/entry/common.c:457
 [<ffffffff837734ea>] sysenter_flags_fixed+0xd/0x17
no locks held by syz-executor5/8072.
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 486 Comm: khungtaskd Not tainted 4.4.113-g202e079 #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800bb9e0000 task.stack: ffff8800bac20000
RIP: 0010:[<ffffffff810c3cf7>]  [<ffffffff810c3cf7>] native_apic_mem_write arch/x86/include/asm/apic.h:94 [inline]
RIP: 0010:[<ffffffff810c3cf7>]  [<ffffffff810c3cf7>] __default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline]
RIP: 0010:[<ffffffff810c3cf7>]  [<ffffffff810c3cf7>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:61 [inline]
RIP: 0010:[<ffffffff810c3cf7>]  [<ffffffff810c3cf7>] flat_send_IPI_mask+0xf7/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800bac27cb8  EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300
RBP: ffff8800bac27ce0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000000000003 R14: ffffffff8426f2e0 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1e6bc77000 CR3: 00000001d5bf6000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8426f2e0 ffffffff847ef680 fffffbfff08fd984 dffffc0000000000
 ffff8801db31bca0 ffff8800bac27d00 ffffffff810b982b ffffffff839f6100
 0000000000000003 ffff8800bac27d60 ffffffff81d0d6f4 0000000000000000
Call Trace:
 [<ffffffff810b982b>] nmi_raise_cpu_backtrace+0x5b/0x70 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81d0d6f4>] nmi_trigger_all_cpu_backtrace+0x4a4/0x550 lib/nmi_backtrace.c:85
 [<ffffffff810b98c4>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff81367b6a>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff81367b6a>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81367b6a>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81367b6a>] watchdog+0x6fa/0xae0 kernel/hung_task.c:238
 [<ffffffff811907d8>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff83771f85>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:506
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 20 17 00 4c 89 e7 57 9d 0f 1f 
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.113-g202e079 #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801da3a97c0 task.stack: ffff8801da3b8000
RIP: 0010:[<ffffffff810d0536>]  [<ffffffff810d0536>] native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:49
RSP: 0018:ffff8801da3bfd98  EFLAGS: 00000246
RAX: 0000000000000007 RBX: ffffffff847dd788 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8801da3aa02c
RBP: ffff8801da3bfd98 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: fffffbfff0708868 R14: ffffffff847ebaf8 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb6a1279000 CR3: 00000001d5bf6000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801da3bfdd0 ffffffff81027ed5 ffff8801da3c0000 ffffffff847dd788
 fffffbfff0708868 ffffffff847ebaf8 0000000000000000 ffff8801da3bfde0
 ffffffff8102945a ffff8801da3bfdf8 ffffffff81220418 dffffc0000000000
Call Trace:
 [<ffffffff81027ed5>] arch_safe_halt arch/x86/include/asm/paravirt.h:117 [inline]
 [<ffffffff81027ed5>] default_idle+0x55/0x3c0 arch/x86/kernel/process.c:291
 [<ffffffff8102945a>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:282
 [<ffffffff81220418>] default_idle_call+0x48/0x70 kernel/sched/idle.c:93
 [<ffffffff81220b1d>] cpuidle_idle_call kernel/sched/idle.c:157 [inline]
 [<ffffffff81220b1d>] cpu_idle_loop kernel/sched/idle.c:253 [inline]
 [<ffffffff81220b1d>] cpu_startup_entry+0x5fd/0x8f0 kernel/sched/idle.c:301
 [<ffffffff810adaf4>] start_secondary+0x304/0x3e0 arch/x86/kernel/smpboot.c:242
Code: 00 00 00 00 00 55 48 89 e5 fa 5d c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 fb 5d c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 fb f4 <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 f4 5d c3 66 0f 1f 84