INFO: task syz-executor3:10030 blocked for more than 120 seconds.
      Not tainted 4.4.120-gd63fdf6 #28
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3   D ffff8801d8faf570 28840 10030   3798 0x00000004
 ffff8801d8faf570 ffff8801d8faf5f0 ffff8801d8faf540 0000000100000000
 ffffffff8122de80 0000000000000000 ffff8801db31fdb8 ffff8801db31fde0
 ffff8801db31f4d8 ffff8800ac7b9800 ffff8800bb2f4800 0000000000000000
Call Trace:
 [<ffffffff8376582a>] schedule+0x7a/0x1b0 kernel/sched/core.c:3353
 [<ffffffff83770b40>] schedule_timeout+0x3a0/0x970 kernel/time/timer.c:1515
 [<ffffffff837637be>] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:4935
 [<ffffffff83766aeb>] io_schedule include/linux/sched.h:447 [inline]
 [<ffffffff83766aeb>] bit_wait_io+0x1b/0xc0 kernel/sched/wait.c:595
 [<ffffffff8376622c>] __wait_on_bit+0x8c/0x140 kernel/sched/wait.c:395
 [<ffffffff8141d3b5>] wait_on_page_bit+0x1e5/0x210 mm/filemap.c:758
 [<ffffffff81425f95>] wait_on_page_locked include/linux/pagemap.h:521 [inline]
 [<ffffffff81425f95>] __lock_page_or_retry+0x115/0x130 mm/filemap.c:928
 [<ffffffff8142630a>] lock_page_or_retry include/linux/pagemap.h:485 [inline]
 [<ffffffff8142630a>] filemap_fault+0x35a/0xc00 mm/filemap.c:1984
 [<ffffffff814964fe>] __do_fault+0x11e/0x270 mm/memory.c:2775
 [<ffffffff814a1c49>] do_read_fault mm/memory.c:2964 [inline]
 [<ffffffff814a1c49>] do_fault mm/memory.c:3129 [inline]
 [<ffffffff814a1c49>] handle_pte_fault mm/memory.c:3298 [inline]
 [<ffffffff814a1c49>] __handle_mm_fault mm/memory.c:3426 [inline]
 [<ffffffff814a1c49>] handle_mm_fault+0x17f9/0x3190 mm/memory.c:3455
 [<ffffffff814933a2>] faultin_page mm/gup.c:326 [inline]
 [<ffffffff814933a2>] __get_user_pages+0x392/0xf00 mm/gup.c:519
 [<ffffffff81494a08>] populate_vma_page_range+0x198/0x230 mm/gup.c:924
 [<ffffffff81494cac>] __mm_populate+0x20c/0x360 mm/gup.c:974
 [<ffffffff81470102>] mm_populate include/linux/mm.h:1924 [inline]
 [<ffffffff81470102>] vm_mmap_pgoff+0x1a2/0x1c0 mm/util.c:300
 [<ffffffff814afe1f>] SYSC_mmap_pgoff mm/mmap.c:1491 [inline]
 [<ffffffff814afe1f>] SyS_mmap_pgoff+0x33f/0x560 mm/mmap.c:1449
 [<ffffffff8101beb6>] SYSC_mmap arch/x86/kernel/sys_x86_64.c:95 [inline]
 [<ffffffff8101beb6>] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:86
 [<ffffffff8377395f>] entry_SYSCALL_64_fastpath+0x1c/0x98
no locks held by syz-executor3/10030.
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 484 Comm: khungtaskd Not tainted 4.4.120-gd63fdf6 #28
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800bb3fe000 task.stack: ffff8800bb3b8000
RIP: 0010:[<ffffffff810c3e67>]  [<ffffffff810c3e67>] native_apic_mem_write arch/x86/include/asm/apic.h:94 [inline]
RIP: 0010:[<ffffffff810c3e67>]  [<ffffffff810c3e67>] __default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline]
RIP: 0010:[<ffffffff810c3e67>]  [<ffffffff810c3e67>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:61 [inline]
RIP: 0010:[<ffffffff810c3e67>]  [<ffffffff810c3e67>] flat_send_IPI_mask+0xf7/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800bb3bfcb8  EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300
RBP: ffff8800bb3bfce0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000000000003 R14: ffffffff8426f420 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7fec00c9b8 CR3: 00000001cee24000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8426f420 ffffffff847efb00 fffffbfff08fda14 dffffc0000000000
 ffff8801db31bca0 ffff8800bb3bfd00 ffffffff810b999b ffffffff839f63c0
 0000000000000003 ffff8800bb3bfd60 ffffffff81d0eff4 0000000000000000
Call Trace:
 [<ffffffff810b999b>] nmi_raise_cpu_backtrace+0x5b/0x70 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81d0eff4>] nmi_trigger_all_cpu_backtrace+0x4a4/0x550 lib/nmi_backtrace.c:85
 [<ffffffff810b9a34>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff81368c9a>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff81368c9a>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81368c9a>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81368c9a>] watchdog+0x6fa/0xae0 kernel/hung_task.c:238
 [<ffffffff81190788>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff83773d85>] 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 6b 2f 17 00 4c 89 e7 57 9d 0f 1f 
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.120-gd63fdf6 #28
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9b49800 task.stack: ffff8801d9b58000
RIP: 0010:[<ffffffff81246d5b>]  [<ffffffff81246d5b>] atomic_cmpxchg arch/x86/include/asm/atomic.h:177 [inline]
RIP: 0010:[<ffffffff81246d5b>]  [<ffffffff81246d5b>] queued_spin_trylock include/asm-generic/qspinlock.h:84 [inline]
RIP: 0010:[<ffffffff81246d5b>]  [<ffffffff81246d5b>] do_raw_spin_lock+0xeb/0x2c0 kernel/locking/spinlock_debug.c:136
RSP: 0018:ffff8801d9b5fd40  EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8801db31f4c0 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffff8801d9b4a0d0 RDI: ffff8801db31f4c4
RBP: ffff8801d9b5fd68 R08: 0000000000000001 R09: ffffffff8514a100
R10: 0000000000000001 R11: 1ffff1003b36bf7a R12: ffff8801db31f4c8
R13: ffff8801db31f4d0 R14: 0000003828acf546 R15: ffff8801d9b60000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001c560f8 CR3: 00000001cbac0000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801db31f4c0 00000000ffffe909 ffff8801db31f528 0000003828acf546
 ffff8801d9b60000 ffff8801d9b5fd88 ffffffff83772ade ffffffff811f7787
 ffff8801db31f4c0 ffff8801d9b5fdc0 ffffffff811f7787 ffff8801db319c40
Call Trace:
 [<ffffffff83772ade>] __raw_spin_lock include/linux/spinlock_api_smp.h:145 [inline]
 [<ffffffff83772ade>] _raw_spin_lock+0x3e/0x50 kernel/locking/spinlock.c:151
 [<ffffffff811f7787>] update_cpu_load_nohz+0xa7/0x140 kernel/sched/fair.c:4998
 [<ffffffff812d7808>] tick_nohz_restart_sched_tick kernel/time/tick-sched.c:716 [inline]
 [<ffffffff812d7808>] tick_nohz_idle_exit+0x1d8/0x3d0 kernel/time/tick-sched.c:946
 [<ffffffff81221815>] cpu_idle_loop kernel/sched/idle.c:267 [inline]
 [<ffffffff81221815>] cpu_startup_entry+0x2a5/0x8f0 kernel/sched/idle.c:301
 [<ffffffff810adc64>] start_secondary+0x304/0x3e0 arch/x86/kernel/smpboot.c:242
Code: c1 ea 03 0f b6 14 02 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 90 01 00 00 8b 03 85 c0 75 11 ba 01 00 00 00 f0 0f b1 13 <85> c0 0f 84 8f 00 00 00 48 c7 c7 c0 30 21 84 48 b8 00 00 00 00