INFO: task kworker/0:1:23 blocked for more than 140 seconds.
      Not tainted 4.9.133+ #53
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:1     D26904    23      2 0x90000000
Workqueue: ipv6_addrconf addrconf_verify_work
 ffff8801da732f80 ffff8801cf6d8580 ffff8801d0bd3c80 ffff8801d17c97c0
 ffff8801db621018
 ffff8801d9c3fae8 ffffffff827f3aa2 0000000000000002 ffff8801da733830
 ffff8801c04c07f8 00ff8801da732f80 ffff8801db6218f0Call Trace:
 [<ffffffff827f4fcf>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff827f5953>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff827f79cd>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff827f79cd>] mutex_lock_nested+0x38d/0x900 kernel/locking/mutex.c:621
 [<ffffffff8232ee67>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
 [<ffffffff826af13e>] addrconf_verify_work+0xe/0x20 net/ipv6/addrconf.c:4366
 [<ffffffff81130d61>] process_one_work+0x831/0x1530 kernel/workqueue.c:2092
 [<ffffffff81131b36>] worker_thread+0xd6/0x1140 kernel/workqueue.c:2226
 [<ffffffff811428dd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff82803edc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373

Showing all locks held in the system:
3 locks held by kworker/0:1/23:
 #0: 
 ("%s"("ipv6_addrconf")){.+.+..}, at: [<ffffffff81130c6c>] process_one_work+0x73c/0x1530 kernel/workqueue.c:2085
 ((addr_chk_work).work){+.+...}, at: [<ffffffff81130ca4>] process_one_work+0x774/0x1530 kernel/workqueue.c:2089
 (rtnl_mutex){+.+.+.}, at: [<ffffffff8232ee67>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
 #0: 
 (rcu_read_lock){......}, at: [<ffffffff8131baec>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 (rcu_read_lock){......}, at: [<ffffffff8131baec>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 (tasklist_lock){.+.+..}, at: [<ffffffff813fe2b4>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
 #0: 
 (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8156cccc>] __fdget_pos+0xac/0xd0 fs/file.c:781
 #0: 
 (&tty->ldisc_sem){++++++}, at: [<ffffffff82801df2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81d2b472>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
 #0: 
 (rtnl_mutex){+.+.+.}, at: [<ffffffff8232ee67>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.133+ #53
 ffff8801d9907d08
 ffffffff81b37069 0000000000000000 0000000000000000 0000000000000000
 0000000000000001 ffffffff81098330 ffff8801d9907d40 ffffffff81b42179
 0000000000000000 0000000000000000 0000000000000003Call Trace:
 [<ffffffff81b37069>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b37069>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81b42179>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81b4210c>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff81098434>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8131c07d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8131c07d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8131c07d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8131c07d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff811428dd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff82803edc>] 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: 4400 Comm: getty Not tainted 4.9.133+ #53
task: ffff8801ca178000 task.stack: ffff8801c5418000
RIP: 0010:[<ffffffff81a12703>] 
c [<ffffffff81a12703>] avtab_hash security/selinux/ss/avtab.c:61 [inline]
RIP: 0010:[<ffffffff81a12703>] 
c [<ffffffff81a12703>] avtab_search_node+0x1c3/0x490 security/selinux/ss/avtab.c:228
RSP: 0018:ffff8801c541f3e8  EFLAGS: 00000203
RAX: 0000000031639956 RBX: ffff8801d4e50000 RCX: 0000000000000002
RDX: 0000000000018b1c RSI: 0000000000001fff RDI: ffff8801d4e50000
RBP: ffff8801c541f440 R08: ffffed0038a83ee1 R09: ffff8801c541f6e4
R10: ffffed0038a83ee0 R11: ffff8801c541f703 R12: 00000000a259a785
R13: ffff8801d4fcae40 R14: ffff8801c541f500 R15: ffff8801c541f6a0
FS:  00007f61ec4f5700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff01ad2fc8 CR3: 00000001d65d0000 CR4: 00000000001606b0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffff8801c541f502
c 0707000000000180
c ffff8801c541f504
c ffff8801d4fe6248
c
 ffff8801c541f440
c ffffffff81b81ba1
c 0000000000000300
c 000000000000015f
c
 ffff8801d4fcae40
c dffffc0000000000
c ffff8801c541f6a0
c ffff8801c541f568
c
Call Trace:
 [<ffffffff81a2981b>] context_struct_compute_av+0x51b/0x1070 security/selinux/ss/services.c:667
 [<ffffffff81a2c2b0>] security_compute_av+0x290/0x770 security/selinux/ss/services.c:1120
 [<ffffffff819e005f>] avc_compute_av+0xcf/0x610 security/selinux/avc.c:974
 [<ffffffff819e22ab>] avc_has_perm_noaudit security/selinux/avc.c:1112 [inline]
 [<ffffffff819e22ab>] avc_has_perm_flags+0x35b/0x3b0 security/selinux/avc.c:1161
 [<ffffffff819efddf>] selinux_inode_follow_link+0x1ef/0x2d0 security/selinux/hooks.c:2984
 [<ffffffff819d88da>] security_inode_follow_link+0xca/0x110 security/security.c:604
 [<ffffffff8153a8d9>] get_link fs/namei.c:1041 [inline]
 [<ffffffff8153a8d9>] link_path_walk+0x6c9/0x1230 fs/namei.c:2126
 [<ffffffff8153b734>] path_lookupat.isra.10+0x1b4/0x410 fs/namei.c:2282
 [<ffffffff8153f6e7>] filename_lookup.part.18+0x177/0x370 fs/namei.c:2317
 [<ffffffff8153f925>] filename_lookup fs/namei.c:2310 [inline]
 [<ffffffff8153f925>] kern_path+0x45/0x70 fs/namei.c:2406
 [<ffffffff82665569>] unix_find_other+0xe9/0x6c0 net/unix/af_unix.c:913
 [<ffffffff8266de84>] unix_stream_connect+0x264/0x1120 net/unix/af_unix.c:1249
 [<ffffffff82291bf8>] SYSC_connect net/socket.c:1575 [inline]
 [<ffffffff82291bf8>] SyS_connect+0x1b8/0x310 net/socket.c:1556
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82803d13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c