INFO: task blkid:27532 blocked for more than 120 seconds.
      Not tainted 4.9.89-ge34e318 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
blkid           D26352 27532   2369 0x00000006
 ffff8801cadc6000 0000000000000000 ffff8801d8749500 ffff8801d9b73000
 ffff8801db321b98 ffff8801c5d77310 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/515:
 #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/3660:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d1a3f>] __fdget_pos+0x9f/0xc0 fs/file.c:781
2 locks held by getty/3788:
 #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/27532:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8162bbbc>] __blkdev_put+0xbc/0x7e0 fs/block_dev.c:1579

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

NMI backtrace for cpu 0
CPU: 0 PID: 515 Comm: khungtaskd Not tainted 4.9.89-ge34e318 #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d869fd00 ffffffff81d93609 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810bb690 ffff8801d869fd38
 ffffffff81d9e72d 0000000000000000 0000000000000000 ffff8801cadc6418
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: 3660 Comm: rsyslogd Not tainted 4.9.89-ge34e318 #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801b5579800 task.stack: ffff8801b84c0000
RIP: 0010:[<ffffffff81c0b2c2>] 
c [<ffffffff81c0b2c2>] avtab_search_node+0x282/0x490 security/selinux/ss/avtab.c:231
RSP: 0018:ffff8801b84c76b8  EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffff8801cdc90c30 RCX: ffffffff81c0b2b6
RDX: 0000000000000000 RSI: ffffed0037098f04 RDI: ffff8801cdc8bba0
RBP: ffff8801b84c7708 R08: ffffed0037098f45 R09: ffff8801b84c7a04
R10: 0000000000000005 R11: ffffed0037098f44 R12: dffffc0000000000
R13: 000000000000032e R14: ffff8801b84c7820 R15: 0000000000000298
FS:  00007f573b080700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 00000001b5f30000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801b84c7822
c ffff8801b84c7824
c 0000000000000002
c ffffed0037098f04
c
 ffff880107077240
c ffffffff8595e508
c 0000000000000029
c ffff8801b84c79c0
c
 dffffc0000000000
c ffff8801b84c7820
c ffff8801b84c7760
c ffffffff81c31f7c
c
Call Trace:
 [<ffffffff81c31f7c>] cond_compute_av+0x5c/0x2e0 security/selinux/ss/conditional.c:646
 [<ffffffff81c254a0>] context_struct_compute_av+0x9d0/0x10b0 security/selinux/ss/services.c:681
 [<ffffffff81c27c02>] security_compute_av+0x2f2/0x7d0 security/selinux/ss/services.c:1120
 [<ffffffff81bd7cab>] avc_compute_av+0xcb/0x640 security/selinux/avc.c:976
 [<ffffffff81bd9e88>] avc_has_perm_noaudit security/selinux/avc.c:1114 [inline]
 [<ffffffff81bd9e88>] avc_has_perm+0x378/0x4f0 security/selinux/avc.c:1148
 [<ffffffff81bf27b9>] task_has_system+0x159/0x240 security/selinux/hooks.c:1697
 [<ffffffff81bf2ad0>] selinux_syslog+0x80/0x90 security/selinux/hooks.c:2252
 [<ffffffff81bcec2d>] security_syslog+0x6d/0xa0 security/security.c:210
 [<ffffffff81262089>] check_syslog_permissions+0x59/0x100 kernel/printk/printk.c:635
 [<ffffffff81265449>] do_syslog+0x89/0xb10 kernel/printk/printk.c:1435
 [<ffffffff816e9a34>] kmsg_read+0x74/0xa0 fs/proc/kmsg.c:39
 [<ffffffff816c062f>] proc_reg_read+0xef/0x170 fs/proc/inode.c:202
 [<ffffffff81569ed3>] __vfs_read+0x103/0x670 fs/read_write.c:449
 [<ffffffff8156ddee>] vfs_read+0x11e/0x380 fs/read_write.c:472
 [<ffffffff81571ae9>] SYSC_read fs/read_write.c:588 [inline]
 [<ffffffff81571ae9>] SyS_read+0xd9/0x1b0 fs/read_write.c:581
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b5ad3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c