INFO: task loop0:5080 blocked for more than 120 seconds.
      Not tainted 4.4.114-ga81d322 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
loop0           D ffff8801ce45ede0 26904  5080      2 0x00000000
 ffff8801ce45ede0 ffffffff847cd6f8 0000000000000000 ffff8800b383e8d0
 ffff8800b383e8a8 ffff8801ce45ee00 ffff8801db31fdb8 ffff8801db31fde0
 ffff8801db31f4d8 ffff8801d95a9800 ffff8800b383e000 ffff8801ce45f670
Call Trace:
 [<ffffffff83765dba>] schedule+0x7a/0x1b0 kernel/sched/core.c:3353
 [<ffffffff837710d0>] schedule_timeout+0x3a0/0x970 kernel/time/timer.c:1515
 [<ffffffff83763d4e>] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:4935
 [<ffffffff81ca6615>] io_schedule include/linux/sched.h:447 [inline]
 [<ffffffff81ca6615>] bt_get+0x305/0x760 block/blk-mq-tag.c:301
 [<ffffffff81ca785b>] __blk_mq_get_tag block/blk-mq-tag.c:325 [inline]
 [<ffffffff81ca785b>] blk_mq_get_tag+0x1eb/0x340 block/blk-mq-tag.c:353
 [<ffffffff81c97c84>] __blk_mq_alloc_request+0x24/0xa50 block/blk-mq.c:215
 [<ffffffff81c9d9d1>] blk_mq_map_request+0x8d1/0xde0 block/blk-mq.c:1190
 [<ffffffff81ca1850>] blk_sq_make_request+0x1a0/0xfc0 block/blk-mq.c:1361
 [<ffffffff81c73f41>] generic_make_request+0x311/0x990 block/blk-core.c:2081
 [<ffffffff81c7473a>] submit_bio+0x17a/0x540 block/blk-core.c:2154
 [<ffffffff815dfcf8>] dio_bio_submit fs/direct-io.c:409 [inline]
 [<ffffffff815dfcf8>] do_blockdev_direct_IO+0x6ba8/0x8810 fs/direct-io.c:1283
 [<ffffffff815e1a0e>] __blockdev_direct_IO+0xae/0xe0 fs/direct-io.c:1342
 [<ffffffff815d0742>] blkdev_direct_IO+0xb2/0xe0 fs/block_dev.c:167
 [<ffffffff81423de0>] generic_file_read_iter+0x360/0x1160 mm/filemap.c:1791
 [<ffffffff815d17a5>] blkdev_read_iter+0x105/0x170 fs/block_dev.c:1679
 [<ffffffff82423b2c>] lo_rw_aio drivers/block/loop.c:506 [inline]
 [<ffffffff82423b2c>] lo_rw_simple drivers/block/loop.c:520 [inline]
 [<ffffffff82423b2c>] do_req_filebacked drivers/block/loop.c:558 [inline]
 [<ffffffff82423b2c>] loop_handle_cmd drivers/block/loop.c:1692 [inline]
 [<ffffffff82423b2c>] loop_queue_work+0x1eac/0x31c0 drivers/block/loop.c:1704
 [<ffffffff81190bab>] kthread_worker_fn+0x27b/0x600 kernel/kthread.c:602
 [<ffffffff811907d8>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff83774305>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:506
no locks held by loop0/5080.
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 486 Comm: khungtaskd Not tainted 4.4.114-ga81d322 #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800bb334800 task.stack: ffff8800bb018000
RIP: 0010:[<ffffffff810c3d57>]  [<ffffffff810c3d57>] native_apic_mem_write arch/x86/include/asm/apic.h:94 [inline]
RIP: 0010:[<ffffffff810c3d57>]  [<ffffffff810c3d57>] __default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline]
RIP: 0010:[<ffffffff810c3d57>]  [<ffffffff810c3d57>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:61 [inline]
RIP: 0010:[<ffffffff810c3d57>]  [<ffffffff810c3d57>] flat_send_IPI_mask+0xf7/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800bb01fcb8  EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300
RBP: ffff8800bb01fce0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000000000003 R14: ffffffff8426f3a0 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcd54e789b8 CR3: 00000001d3bd6000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8426f3a0 ffffffff847ef700 fffffbfff08fd994 dffffc0000000000
 ffff8801db31bca0 ffff8800bb01fd00 ffffffff810b988b ffffffff839f6180
 0000000000000003 ffff8800bb01fd60 ffffffff81d0e8b4 0000000000000000
Call Trace:
 [<ffffffff810b988b>] nmi_raise_cpu_backtrace+0x5b/0x70 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81d0e8b4>] nmi_trigger_all_cpu_backtrace+0x4a4/0x550 lib/nmi_backtrace.c:85
 [<ffffffff810b9924>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff81368cba>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff81368cba>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81368cba>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81368cba>] watchdog+0x6fa/0xae0 kernel/hung_task.c:238
 [<ffffffff811907d8>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff83774305>] 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 30 17 00 4c 89 e7 57 9d 0f 1f 
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.114-ga81d322 #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9b49800 task.stack: ffff8801d9b58000
RIP: 0010:[<ffffffff810c330c>]  [<ffffffff810c330c>] native_apic_mem_write+0xc/0x10 arch/x86/include/asm/apic.h:94
RSP: 0018:ffff8801db307f90  EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffffffff8426f3a0 RCX: 0000000000000000
RDX: 1ffffffff084de92 RSI: 0000000000000000 RDI: 00000000000000b0
RBP: ffff8801db307f90 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: fffffbfff070887c R14: ffffffff847ebb78 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6815e23000 CR3: 00000001ce748000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801db307fa8 ffffffff810ab345 ffffffff847dd808 ffff8801d9b5fd98
 ffffffff83776430 ffff8801d9b5fce8 <EOI>  0000000000000000 ffffffff847ebb78
 fffffbfff070887c 0000000000000001 ffff8801d9b5fd98 ffffffff847dd808
Call Trace:
 <IRQ> 
d [<ffffffff810ab345>] apic_eoi arch/x86/include/asm/apic.h:397 [inline]
 <IRQ> 
d [<ffffffff810ab345>] ack_APIC_irq arch/x86/include/asm/apic.h:441 [inline]
 <IRQ> 
d [<ffffffff810ab345>] smp_reschedule_interrupt+0x55/0x80 arch/x86/kernel/smp.c:262
 [<ffffffff83776430>] reschedule_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:760
 <EOI> 
d [<ffffffff810d0536>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:49
 [<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
 [<ffffffff81221458>] default_idle_call+0x48/0x70 kernel/sched/idle.c:93
 [<ffffffff81221b5d>] cpuidle_idle_call kernel/sched/idle.c:157 [inline]
 [<ffffffff81221b5d>] cpu_idle_loop kernel/sched/idle.c:253 [inline]
 [<ffffffff81221b5d>] cpu_startup_entry+0x5fd/0x8f0 kernel/sched/idle.c:301
 [<ffffffff810adb54>] start_secondary+0x304/0x3e0 arch/x86/kernel/smpboot.c:242
Code: a1 06 00 66 90 66 2e 0f 1f 84 00 00 00 00 00 55 be 01 00 00 00 48 89 e5 e8 e2 d2 1b 00 5d c3 55 89 ff 48 89 e5 89 b7 00 b0 5f ff <5d> c3 66 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 89 fb