INFO: task kworker/0:2:2003 blocked for more than 140 seconds.
      Not tainted 4.14.112+ #57
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:2     D27736  2003      2 0x80000000
Workqueue: events linkwatch_event
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3498
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
 linkwatch_event+0xa/0x50 net/core/link_watch.c:236
 process_one_work+0x7c6/0x1510 kernel/workqueue.c:2134
 worker_thread+0x5d7/0x1080 kernel/workqueue.c:2271
 kthread+0x310/0x420 kernel/kthread.c:232
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402
INFO: task kworker/1:1:20764 blocked for more than 140 seconds.
      Not tainted 4.14.112+ #57
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/1:1     D27664 20764      2 0x80000000
Workqueue: ipv6_addrconf addrconf_verify_work
Call Trace:
 schedule+0x92/0x1c0 kernel/sched/core.c:3498
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
 addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4431
 process_one_work+0x7c6/0x1510 kernel/workqueue.c:2134
 worker_thread+0x5d7/0x1080 kernel/workqueue.c:2271
 kthread+0x310/0x420 kernel/kthread.c:232
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402

Showing all locks held in the system:
1 lock held by khungtaskd/23:
 #0:  (tasklist_lock){.+.+}, at: [<00000000bbfc504f>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4544
2 locks held by getty/1752:
 #0:  (&tty->ldisc_sem){++++}, at: [<00000000c2a3d2dd>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<00000000ed3d1595>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156
3 locks held by kworker/0:2/2003:
 #0:  ("events"){+.+.}, at: [<00000000910ff521>] process_one_work+0x6e5/0x1510 kernel/workqueue.c:2105
 #1:  ((linkwatch_work).work){+.+.}, at: [<000000003f55e312>] process_one_work+0x71b/0x1510 kernel/workqueue.c:2109
 #2:  (rtnl_mutex){+.+.}, at: [<000000005474d496>] linkwatch_event+0xa/0x50 net/core/link_watch.c:236
3 locks held by kworker/1:1/20764:
 #0:  ("%s"("ipv6_addrconf")){+.+.}, at: [<00000000910ff521>] process_one_work+0x6e5/0x1510 kernel/workqueue.c:2105
 #1:  ((addr_chk_work).work){+.+.}, at: [<000000003f55e312>] process_one_work+0x71b/0x1510 kernel/workqueue.c:2109
 #2:  (rtnl_mutex){+.+.}, at: [<00000000f582c4c8>] addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4431

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

NMI backtrace for cpu 0
CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.112+ #57
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xb9/0x10e lib/dump_stack.c:53
 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8 Comm: rcu_preempt Not tainted 4.14.112+ #57
task: 00000000c4481cc8 task.stack: 0000000073198f30
RIP: 0010:trace_hardirqs_off_caller+0x55/0x260 kernel/locking/lockdep.c:2946
RSP: 0000:ffff8881daa57aa8 EFLAGS: 00000002
RAX: 0000000000000003 RBX: ffff8881daa3af00 RCX: 1ffffffff78424f0
RDX: 0000000000000004 RSI: ffff8881daa57b50 RDI: 0000000000000001
RBP: ffffffffbb44b1bc R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881daa3af00
R13: ffffed103b54af91 R14: ffff8881daa57b50 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000741219c01c65 CR3: 0000000026026003 CR4: 00000000001606a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]
 _raw_spin_lock_irqsave+0x1c/0x60 kernel/locking/spinlock.c:160
 lock_timer_base+0x58/0x190 kernel/time/timer.c:921
 try_to_del_timer_sync+0x7a/0x110 kernel/time/timer.c:1177
 del_timer_sync+0xe1/0x120 kernel/time/timer.c:1245
 schedule_timeout+0x4df/0xe80 kernel/time/timer.c:1745
 rcu_gp_kthread+0xc52/0x1f00 kernel/rcu/tree.c:2255
 kthread+0x310/0x420 kernel/kthread.c:232
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402
Code: 48 8b 1c 25 c0 de 01 00 38 d0 7c 08 84 d2 0f 85 bf 01 00 00 8b 3d 7c f2 41 02 85 ff 0f 84 6a 01 00 00 65 4c 8b 24 25 c0 de 01 00 <49> 8d bc 24 2c 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa