Buffer I/O error on dev loop0, logical block 0, async page read
INFO: task blkid:18186 blocked for more than 120 seconds.
      Not tainted 4.9.89-gf152ce1 #65
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid           D27072 18186   2365 0x00000006
 ffff8801cfcab000 0000000000000000 ffff8801b6884a80 ffff8801d9b73000
 ffff8801db321b98 ffff8801d0767310 ffffffff838a4c0b 0000000041b58ab3
 ffffffff84193da8 00ffffff81239af0 ffff8801db322468 ffff8801db322490
Call Trace:
 [<ffffffff838a61af>] schedule+0x7f/0x1b0 kernel/sched/core.c:3551
 [<ffffffff838b216c>] schedule_timeout+0x56c/0x10b0 kernel/time/timer.c:1768
 [<ffffffff838a43be>] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:5173
 [<ffffffff838a7629>] io_schedule include/linux/sched.h:460 [inline]
 [<ffffffff838a7629>] bit_wait_io+0x19/0xa0 kernel/sched/wait.c:582
 [<ffffffff838a6e92>] __wait_on_bit_lock+0xc2/0x1c0 kernel/sched/wait.c:421
 [<ffffffff81430a0f>] __lock_page+0xff/0x160 mm/filemap.c:934
 [<ffffffff8146a41a>] lock_page include/linux/pagemap.h:454 [inline]
 [<ffffffff8146a41a>] truncate_inode_pages_range+0xc1a/0x12c0 mm/truncate.c:373
 [<ffffffff8146aae4>] truncate_inode_pages+0x24/0x30 mm/truncate.c:401
 [<ffffffff8162848c>] kill_bdev+0xbc/0xf0 fs/block_dev.c:96
 [<ffffffff8162bc91>] __blkdev_put+0x191/0x7e0 fs/block_dev.c:1586
 [<ffffffff8162d0b5>] blkdev_put+0x85/0x550 fs/block_dev.c:1663
 [<ffffffff8162d60b>] blkdev_close+0x8b/0xb0 fs/block_dev.c:1670
 [<ffffffff8157366c>] __fput+0x28c/0x6e0 fs/file_table.c:208
 [<ffffffff81573b45>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff81195fe5>] task_work_run+0x115/0x190 kernel/task_work.c:116
 [<ffffffff8113c997>] exit_task_work include/linux/task_work.h:21 [inline]
 [<ffffffff8113c997>] do_exit+0x7e7/0x2a40 kernel/exit.c:833
 [<ffffffff811430a8>] do_group_exit+0x108/0x320 kernel/exit.c:937
 [<ffffffff81165f24>] get_signal+0x4d4/0x14e0 kernel/signal.c:2317
 [<ffffffff81052c87>] do_signal+0x87/0x19f0 arch/x86/kernel/signal.c:807
 [<ffffffff81004ff1>] exit_to_usermode_loop+0xe1/0x120 arch/x86/entry/common.c:157
 [<ffffffff810066cf>] prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline]
 [<ffffffff810066cf>] syscall_return_slowpath arch/x86/entry/common.c:260 [inline]
 [<ffffffff810066cf>] do_syscall_64+0x36f/0x490 arch/x86/entry/common.c:287
 [<ffffffff838b5ad3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/516:
 #0:  (rcu_read_lock){......}, at: [<ffffffff81370ca5>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81370ca5>] watchdog+0x125/0xa70 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81235c50>] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3652:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d1a3f>] __fdget_pos+0x9f/0xc0 fs/file.c:781
2 locks held by getty/3780:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff838b3ce2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff82008bc4>] n_tty_read+0x1f4/0x16c0 drivers/tty/n_tty.c:2133
1 lock held by blkid/18186:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8162bbbc>] __blkdev_put+0xbc/0x7e0 fs/block_dev.c:1579

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 516 Comm: khungtaskd Not tainted 4.9.89-gf152ce1 #65
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d874fd00 ffffffff81d93609 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810bb690 ffff8801d874fd38
 ffffffff81d9e72d 0000000000000000 0000000000000000 ffff8801cfcab418
Call Trace:
 [<ffffffff81d93609>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d93609>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81d9e72d>] nmi_cpu_backtrace+0xfd/0x120 lib/nmi_backtrace.c:99
 [<ffffffff81d9e867>] nmi_trigger_cpumask_backtrace+0x117/0x190 lib/nmi_backtrace.c:60
 [<ffffffff810bb784>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81371270>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81371270>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81371270>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81371270>] watchdog+0x6f0/0xa70 kernel/hung_task.c:239
 [<ffffffff8119af4d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838b5c9c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.89-gf152ce1 #65
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9b73000 task.stack: ffff8801d9b88000
RIP: 0010:[<ffffffff812337f9>] 
c [<ffffffff812337f9>] lock_is_held+0xd9/0x140 kernel/locking/lockdep.c:3795
RSP: 0018:ffff8801db307d90  EFLAGS: 00000803
RAX: dffffc0000000000 RBX: 0000000000000246 RCX: 1ffffffff084007d
RDX: 0000000000000000 RSI: ffffffff844bae40 RDI: ffff8801d9b738ac
RBP: ffff8801db307da8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000020 R11: ffff8801d9b73000 R12: ffff8801d9b73000
R13: 0000000000000000 R14: ffff8801db321b80 R15: ffff8801d9acd680
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000010e0770 CR3: 00000001c1480000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff84409000
c ffff8801d9acd680
c 0000000000000001
c ffff8801db307eb0
c
 ffffffff81205dfe
c ffffffff812056cb
c 0000000000000000
c ffff8801d9b738b0
c
 ffff8801d9b73888
c ffff8801db307e90
c 0000000000000046
c 0000000000000046
c
Call Trace:
 <IRQ> 
d [<ffffffff81205dfe>] rebalance_domains+0x7fe/0xb00 kernel/sched/fair.c:10077
 [<ffffffff812063f8>] run_rebalance_domains+0x2f8/0x540 kernel/sched/fair.c:10331
 [<ffffffff838bc5d6>] __do_softirq+0x206/0x951 kernel/softirq.c:284
 [<ffffffff81147315>] invoke_softirq kernel/softirq.c:364 [inline]
 [<ffffffff81147315>] irq_exit+0x165/0x190 kernel/softirq.c:405
 [<ffffffff838ba1fb>] smp_reschedule_interrupt+0x6b/0x80 arch/x86/kernel/smp.c:267
 [<ffffffff838b7e10>] reschedule_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:671
 <EOI> 
d [<ffffffff838b4756>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53
 [<ffffffff838b3d85>] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline]
 [<ffffffff838b3d85>] default_idle+0x55/0x360 arch/x86/kernel/process.c:295
 [<ffffffff8106be0a>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:286
 [<ffffffff838b4b96>] default_idle_call+0x36/0x60 kernel/sched/idle.c:97
 [<ffffffff81224520>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff81224520>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff81224520>] cpu_startup_entry+0x2b0/0x380 kernel/sched/idle.c:303
 [<ffffffff810b0693>] start_secondary+0x303/0x3e0 arch/x86/kernel/smpboot.c:254
Code: 
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c<48> 
c89 
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cd2 
c75 
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c84 
c24 
c