INFO: task syz-executor0:19154 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 ffff8801d0cc7538 27936 19154   9361 0x20020004
 ffff8801d0cc7538 ffffffff812364a0 ffff8801d4000238 ffffe8ffffc13680
 ffff8801d4000230 ffff8801d0cc7500 ffff8801db21fdb8 ffff8801db21fde0
 ffff8801db21f4d8 ffff8801d4355f00 ffff8801d23597c0 ffff8801d0cc0000
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
 [<ffffffff815ddcb4>] io_schedule include/linux/sched.h:447 [inline]
 [<ffffffff815ddcb4>] dio_await_one fs/direct-io.c:449 [inline]
 [<ffffffff815ddcb4>] dio_await_completion fs/direct-io.c:503 [inline]
 [<ffffffff815ddcb4>] do_blockdev_direct_IO+0x4794/0x8830 fs/direct-io.c:1313
 [<ffffffff815e1dfe>] __blockdev_direct_IO+0xae/0xe0 fs/direct-io.c:1342
 [<ffffffff815d0b12>] blkdev_direct_IO+0xb2/0xe0 fs/block_dev.c:167
 [<ffffffff81422fb0>] generic_file_read_iter+0x360/0x1170 mm/filemap.c:1791
 [<ffffffff815d1b75>] blkdev_read_iter+0x105/0x170 fs/block_dev.c:1679
 [<ffffffff8151cb79>] new_sync_read fs/read_write.c:422 [inline]
 [<ffffffff8151cb79>] __vfs_read+0x339/0x440 fs/read_write.c:434
 [<ffffffff8151e7e3>] vfs_read+0x123/0x3a0 fs/read_write.c:454
 [<ffffffff81521129>] SYSC_read fs/read_write.c:569 [inline]
 [<ffffffff81521129>] SyS_read+0xd9/0x1b0 fs/read_write.c:562
 [<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-executor0/19154.
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.112-g5f6325b #21
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffffffff84217840 task.stack: ffffffff84200000
RIP: 0010:[<ffffffff81d65566>]  [<ffffffff81d65566>] check_preemption_disabled+0x6/0x200 lib/smp_processor_id.c:12
RSP: 0018:ffffffff84207d30  EFLAGS: 00000093
RAX: ffffffff84217840 RBX: 00000000000072e6 RCX: ffffffff81d65769
RDX: 0000000000000000 RSI: ffffffff839fdb20 RDI: ffffffff839fdb60
RBP: ffffffff84207d38 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffffffff0840f7a R12: ffffffff85701640
R13: ffffffff84272300 R14: 0000000000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000148f188 CR3: 00000001d00a2000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 dffffc0000000000 ffffffff84207d48 ffffffff81d6577c ffffffff84207d58
 ffffffff810d00c0 ffffffff84207d68 ffffffff810d00f9 ffffffff84207dc8
 ffffffff812bf27a ffffffff812d6863 ffffffff81d6559b 0000000000000002
Call Trace:
 [<ffffffff81d6577c>] debug_smp_processor_id+0x1c/0x20 lib/smp_processor_id.c:56
 [<ffffffff810d00c0>] kvm_clock_read+0x10/0x40 arch/x86/kernel/kvmclock.c:89
 [<ffffffff810d00f9>] kvm_clock_get_cycles+0x9/0x10 arch/x86/kernel/kvmclock.c:98
 [<ffffffff812bf27a>] tk_clock_read kernel/time/timekeeping.c:140 [inline]
 [<ffffffff812bf27a>] timekeeping_get_delta kernel/time/timekeeping.c:234 [inline]
 [<ffffffff812bf27a>] timekeeping_get_ns kernel/time/timekeeping.c:340 [inline]
 [<ffffffff812bf27a>] ktime_get+0xea/0x1d0 kernel/time/timekeeping.c:758
 [<ffffffff812d6863>] tick_nohz_idle_exit+0x153/0x3d0 kernel/time/tick-sched.c:940
 [<ffffffff81220967>] cpu_idle_loop kernel/sched/idle.c:267 [inline]
 [<ffffffff81220967>] cpu_startup_entry+0x2e7/0x820 kernel/sched/idle.c:301
 [<ffffffff83763409>] rest_init+0x189/0x190 init/main.c:410
 [<ffffffff84820811>] start_kernel+0x6b9/0x6ee init/main.c:682
 [<ffffffff8481f312>] x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:196
 [<ffffffff8481f454>] x86_64_start_kernel+0x140/0x163 arch/x86/kernel/head64.c:185
Code: 51 8b 79 ff e9 b8 f9 ff ff e8 a7 8b 79 ff e9 ef fa ff ff e8 9d 8b 79 ff 48 8b 8d 70 ff ff ff e9 a2 fa ff ff 90 55 48 89 e5 41 57 <41> 56 41 55 49 89 f5 41 54 49 89 fc 53 48 83 ec 08 e8 74 a9 5f 
NMI backtrace for cpu 1
CPU: 1 PID: 485 Comm: khungtaskd Not tainted 4.4.112-g5f6325b #21
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800bb3fc740 task.stack: ffff8800bac70000
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:ffff8800bac77cb8  EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300
RBP: ffff8800bac77ce0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000000000003 R14: ffffffff8426ec20 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8da7100000 CR3: 00000000ba3a0000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8426ec20 ffffffff847ee680 000000000001bca0 0000000000000040
 dffffc0000000000 ffff8800bac77d00 ffffffff810b99bb ffffffff839f59a0
 0000000000000003 ffff8800bac77d60 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