INFO: task loop0:9457 blocked for more than 120 seconds.
      Not tainted 4.4.130-ged11d8f #29
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
loop0           D ffff8801d92f6d40 26880  9457      2 0x00000000
 ffff8801d92f6d40 ffff8801b9eb50d8 ffff8801b9eb4800 ffffffff838c0129
 ffff8801d92f6e00 ffff8801db21fdb8 ffff8801db21fde0 ffff8801db21f4d8
 ffff8801db21f4c0 ffff8800ae08c800 ffff8801b9eb4800 ffff8801d92f7610
Call Trace:
 [<ffffffff838b14da>] schedule+0x7a/0x1b0 kernel/sched/core.c:3359
 [<ffffffff838bc8f1>] schedule_timeout+0x481/0x8b0 kernel/time/timer.c:1515
 [<ffffffff838af39a>] io_schedule_timeout+0x1ba/0x390 kernel/sched/core.c:4941
 [<ffffffff81db12af>] io_schedule include/linux/sched.h:447 [inline]
 [<ffffffff81db12af>] bt_get+0x2af/0x760 block/blk-mq-tag.c:301
 [<ffffffff81db25a5>] __blk_mq_get_tag block/blk-mq-tag.c:325 [inline]
 [<ffffffff81db25a5>] blk_mq_get_tag+0x1f5/0x360 block/blk-mq-tag.c:353
 [<ffffffff81da2267>] __blk_mq_alloc_request+0x27/0xa40 block/blk-mq.c:215
 [<ffffffff81da8412>] blk_mq_map_request.isra.42+0x732/0xe00 block/blk-mq.c:1190
 [<ffffffff81dac48d>] blk_sq_make_request+0x1ad/0xe60 block/blk-mq.c:1361
 [<ffffffff81d7e4a1>] generic_make_request+0x211/0x9b0 block/blk-core.c:2081
 [<ffffffff81d7ed1f>] submit_bio+0xdf/0x3b0 block/blk-core.c:2154
 [<ffffffff815e122b>] dio_bio_submit fs/direct-io.c:409 [inline]
 [<ffffffff815e122b>] do_blockdev_direct_IO+0x5aab/0x82f0 fs/direct-io.c:1283
 [<ffffffff815e3b1e>] __blockdev_direct_IO+0xae/0xe0 fs/direct-io.c:1342
 [<ffffffff815d0902>] blkdev_direct_IO+0xb2/0xe0 fs/block_dev.c:167
 [<ffffffff81422b1c>] generic_file_read_iter+0x35c/0x1150 mm/filemap.c:1790
 [<ffffffff815d3605>] blkdev_read_iter+0x105/0x170 fs/block_dev.c:1679
 [<ffffffff8251ce61>] lo_rw_aio+0x481/0x870 drivers/block/loop.c:506
 [<ffffffff8251f0b7>] lo_rw_simple drivers/block/loop.c:520 [inline]
 [<ffffffff8251f0b7>] do_req_filebacked drivers/block/loop.c:558 [inline]
 [<ffffffff8251f0b7>] loop_handle_cmd drivers/block/loop.c:1705 [inline]
 [<ffffffff8251f0b7>] loop_queue_work+0x12b7/0x1620 drivers/block/loop.c:1717
 [<ffffffff81190a83>] kthread_worker_fn+0x1c3/0x610 kernel/kthread.c:602
 [<ffffffff81190768>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff838bf955>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:510
no locks held by loop0/9457.
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 492 Comm: khungtaskd Not tainted 4.4.130-ged11d8f #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9299800 task.stack: ffff8801d8e20000
RIP: 0010:[<ffffffff810bfd66>]  [<ffffffff810bfd66>] native_apic_mem_write arch/x86/include/asm/apic.h:94 [inline]
RIP: 0010:[<ffffffff810bfd66>]  [<ffffffff810bfd66>] __default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline]
RIP: 0010:[<ffffffff810bfd66>]  [<ffffffff810bfd66>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:61 [inline]
RIP: 0010:[<ffffffff810bfd66>]  [<ffffffff810bfd66>] flat_send_IPI_mask+0xf6/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8801d8e27cc8  EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300
RBP: ffff8801d8e27cf0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000000000003 R14: 0000000000000002 R15: ffffffff8446f7a0
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000db9b10 CR3: 00000001cb826000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8446f7a0 ffffffff84a189a0 0000000000000007 fffffbfff0942be4
 0000000000000040 ffff8801d8e27d10 ffffffff810b5d21 ffffffff83c0b0a0
 0000000000000003 ffff8801d8e27d68 ffffffff81e18d03 ffff8801b9eb4800
Call Trace:
 [<ffffffff810b5d21>] nmi_raise_cpu_backtrace+0x61/0x80 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81e18d03>] nmi_trigger_all_cpu_backtrace.cold.4+0x70/0xad lib/nmi_backtrace.c:85
 [<ffffffff810b5dc4>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff8141a199>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff8141a199>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8141a199>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8141a199>] watchdog.cold.1+0xd3/0xee kernel/hung_task.c:238
 [<ffffffff81190768>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff838bf955>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:510
Code: b3 5f ff f6 c4 10 75 e2 44 89 e8 c1 e0 18 89 04 25 10 b3 5f ff 44 89 f2 09 da 80 cf 04 41 83 fe 02 0f 44 d3 89 14 25 00 b3 5f ff <41> f7 c4 00 02 00 00 75 1a 4c 89 e7 57 9d 0f 1f 44 00 00 e8 a2 
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.130-ged11d8f #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9a41800 task.stack: ffff8801d9a50000
RIP: 0010:[<ffffffff81e22ba4>]  [<ffffffff81e22ba4>] rb_next+0x94/0x140 lib/rbtree.c:501
RSP: 0018:ffff8801d9a57c40  EFLAGS: 00000046
RAX: ffff8800b743f820 RBX: ffff8800b743f820 RCX: 0000000000000001
RDX: 1ffff10016e87f05 RSI: ffffffff81e2b8fa RDI: ffff8800b743f828
RBP: ffff8801d9a57c68 R08: ffffffff8533dfd0 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8801d9a41800 R12: ffff8801db319c40
R13: ffff8800b743f820 R14: dffffc0000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faddcb8a000 CR3: 00000001cb826000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff844bdba0 ffff8801db319c40 ffff8801db319710 ffff8801db319718
 0000000000000001 ffff8801d9a57c98 ffffffff81e2b902 ffffffff844bdba0
 ffff8801db319c40 ffff8801db319700 ffff8801db319640 ffff8801d9a57cd0
Call Trace:
 [<ffffffff81e2b902>] timerqueue_del+0xd2/0x170 lib/timerqueue.c:81
 [<ffffffff8129ba1e>] __remove_hrtimer+0x8e/0x250 kernel/time/hrtimer.c:917
 [<ffffffff8129ea31>] remove_hrtimer kernel/time/hrtimer.c:959 [inline]
 [<ffffffff8129ea31>] hrtimer_try_to_cancel+0x2c1/0x660 kernel/time/hrtimer.c:1060
 [<ffffffff8129edf2>] hrtimer_cancel+0x22/0x40 kernel/time/hrtimer.c:1080
 [<ffffffff812c588e>] tick_nohz_restart+0x1e/0x190 kernel/time/tick-sched.c:559
 [<ffffffff812c70d7>] tick_nohz_restart_sched_tick kernel/time/tick-sched.c:726 [inline]
 [<ffffffff812c70d7>] tick_nohz_idle_exit+0x247/0x3d0 kernel/time/tick-sched.c:946
 [<ffffffff8121bd87>] cpu_idle_loop kernel/sched/idle.c:267 [inline]
 [<ffffffff8121bd87>] cpu_startup_entry+0x2a7/0x780 kernel/sched/idle.c:301
 [<ffffffff810aa174>] start_secondary+0x324/0x400 arch/x86/kernel/smpboot.c:242
Code: 48 bb 00 00 00 00 00 fc ff df 48 85 c0 75 54 4c 89 eb 48 83 e3 fc 48 89 d8 74 38 48 8d 7b 08 48 89 fa 48 c1 ea 03 42 80 3c 32 00 <75> 70 4c 3b 63 08 75 20 48 89 d8 48 c1 e8 03 42 80 3c 30 00 75