INFO: task syz-executor0:8627 blocked for more than 120 seconds.
      Not tainted 4.4.107-g610c835 #12
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D ffff8800b7ecf538 26872  8627   3520 0x00000004
 ffff8800b7ecf538 ffffffff81ca514b 1ffff10016fd9ea2 0000000000000000
 ffff8801d7f87038 ffff8800b9a00000 ffff8801db31f878 ffff8801db31f8a0
 ffff8801db31ef98 ffff8801d32ddf00 ffff8800b7a94740 ffff8800b7ec8000
Call Trace:
 [<ffffffff83765d3a>] schedule+0x9a/0x1c0 kernel/sched/core.c:3351
 [<ffffffff83770fd1>] schedule_timeout+0x3a1/0x970 kernel/time/timer.c:1508
 [<ffffffff83763cbe>] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:4932
 [<ffffffff83766feb>] io_schedule include/linux/sched.h:447 [inline]
 [<ffffffff83766feb>] bit_wait_io+0x1b/0xc0 kernel/sched/wait.c:595
 [<ffffffff8376672c>] __wait_on_bit+0x8c/0x140 kernel/sched/wait.c:395
 [<ffffffff81419fd5>] wait_on_page_bit+0x1e5/0x210 mm/filemap.c:758
 [<ffffffff81422be5>] wait_on_page_locked include/linux/pagemap.h:521 [inline]
 [<ffffffff81422be5>] __lock_page_or_retry+0x115/0x130 mm/filemap.c:928
 [<ffffffff81422f5a>] lock_page_or_retry include/linux/pagemap.h:485 [inline]
 [<ffffffff81422f5a>] filemap_fault+0x35a/0xc00 mm/filemap.c:1984
 [<ffffffff8149404e>] __do_fault+0x11e/0x270 mm/memory.c:2775
 [<ffffffff8149f639>] do_read_fault mm/memory.c:2964 [inline]
 [<ffffffff8149f639>] do_fault mm/memory.c:3129 [inline]
 [<ffffffff8149f639>] handle_pte_fault mm/memory.c:3298 [inline]
 [<ffffffff8149f639>] __handle_mm_fault mm/memory.c:3426 [inline]
 [<ffffffff8149f639>] handle_mm_fault+0x17f9/0x3190 mm/memory.c:3455
 [<ffffffff81490eb2>] faultin_page mm/gup.c:326 [inline]
 [<ffffffff81490eb2>] __get_user_pages+0x3c2/0xf70 mm/gup.c:519
 [<ffffffff81492558>] populate_vma_page_range+0x198/0x230 mm/gup.c:924
 [<ffffffff814927fc>] __mm_populate+0x20c/0x360 mm/gup.c:974
 [<ffffffff8146ce52>] mm_populate include/linux/mm.h:1924 [inline]
 [<ffffffff8146ce52>] vm_mmap_pgoff+0x1a2/0x1c0 mm/util.c:276
 [<ffffffff814ad87f>] SYSC_mmap_pgoff mm/mmap.c:1491 [inline]
 [<ffffffff814ad87f>] SyS_mmap_pgoff+0x33f/0x560 mm/mmap.c:1449
 [<ffffffff8101be16>] SYSC_mmap arch/x86/kernel/sys_x86_64.c:95 [inline]
 [<ffffffff8101be16>] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:86
 [<ffffffff83773d36>] entry_SYSCALL_64_fastpath+0x16/0x76
no locks held by syz-executor0/8627.
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 485 Comm: khungtaskd Not tainted 4.4.107-g610c835 #12
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800bac017c0 task.stack: ffff8800bac10000
RIP: 0010:[<ffffffff810c32e7>]  [<ffffffff810c32e7>] native_apic_mem_write arch/x86/include/asm/apic.h:94 [inline]
RIP: 0010:[<ffffffff810c32e7>]  [<ffffffff810c32e7>] __default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline]
RIP: 0010:[<ffffffff810c32e7>]  [<ffffffff810c32e7>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:61 [inline]
RIP: 0010:[<ffffffff810c32e7>]  [<ffffffff810c32e7>] flat_send_IPI_mask+0xf7/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800bac17cb8  EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300
RBP: ffff8800bac17ce0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000000000003 R14: ffffffff8426abe0 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe0e29a5000 CR3: 00000001d34f5000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8426abe0 ffffffff847e8600 00000000000194a0 0000000000000040
 dffffc0000000000 ffff8800bac17d00 ffffffff810b8e1b ffffffff839f53e0
 0000000000000003 ffff8800bac17d60 ffffffff81d0f4d7 0000000000000000
Call Trace:
 [<ffffffff810b8e1b>] nmi_raise_cpu_backtrace+0x5b/0x70 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81d0f4d7>] nmi_trigger_all_cpu_backtrace+0x4a7/0x550 lib/nmi_backtrace.c:85
 [<ffffffff810b8eb4>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff81365a7a>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff81365a7a>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81365a7a>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81365a7a>] watchdog+0x6fa/0xae0 kernel/hung_task.c:238
 [<ffffffff8118dea8>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff837740ef>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:468
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 3b 09 17 00 4c 89 e7 57 9d 0f 1f 
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.107-g610c835 #12
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801da2997c0 task.stack: ffff8801da2a8000
RIP: 0010:[<ffffffff810cf516>]  [<ffffffff810cf516>] native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:49
RSP: 0018:ffff8801da2afd78  EFLAGS: 00000246
RAX: 0000000000000007 RBX: ffffffff847d6708 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8801da29a02c
RBP: ffff8801da2afd78 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f01449c59b8 CR3: 00000001d34f5000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801da2afdb0 ffffffff81027d75 ffff8801da2b0000 ffffffff847d6708
 0000000000000000 0000000000000000 dffffc0000000000 ffff8801da2afdc0
 ffffffff810292ea ffff8801da2afdd8 ffffffff8121e338 ffff8801da2b0000
Call Trace:
 [<ffffffff81027d75>] arch_safe_halt arch/x86/include/asm/paravirt.h:117 [inline]
 [<ffffffff81027d75>] default_idle+0x55/0x3c0 arch/x86/kernel/process.c:291
 [<ffffffff810292ea>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:282
 [<ffffffff8121e338>] default_idle_call+0x48/0x70 kernel/sched/idle.c:93
 [<ffffffff8121ea45>] cpuidle_idle_call kernel/sched/idle.c:157 [inline]
 [<ffffffff8121ea45>] cpu_idle_loop kernel/sched/idle.c:253 [inline]
 [<ffffffff8121ea45>] cpu_startup_entry+0x605/0x820 kernel/sched/idle.c:301
 [<ffffffff810ad2e4>] start_secondary+0x304/0x3e0 arch/x86/kernel/smpboot.c:251
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