IPVS: sync thread started: state = BACKUP, mcast_ifn = lo, syncid = 0, id = 0
IPVS: stopping backup sync thread 9245 ...
INFO: task kworker/0:2:1832 blocked for more than 120 seconds.
      Not tainted 4.9.99-gc2f9bce #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:2     D26488  1832      2 0x00000000
Workqueue: events_power_efficient reg_check_chans_work
 ffff8801ce098000 0000000000000000 ffff8801c36a8540 ffffffff84629800
 ffff8801db221b98 ffff8801ce0c7a18 ffffffff839e377d ffff8801ce0988c8
 ffffed0039c13118 ffff8801ce098000 00fffc0000000000 ffff8801db222468
Call Trace:
 [<ffffffff839e4d7f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839e5703>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3590
 [<ffffffff839e9b86>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff839e9b86>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff830b1837>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
 [<ffffffff836ddda4>] reg_check_chans_work+0x74/0xd90 net/wireless/reg.c:1652
 [<ffffffff8118ae31>] process_one_work+0x7e1/0x1500 kernel/workqueue.c:2092
 [<ffffffff8118bc26>] worker_thread+0xd6/0x10a0 kernel/workqueue.c:2226
 [<ffffffff8119ad5d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f481c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373

Showing all locks held in the system:
3 locks held by kworker/1:1/24:
 #0:  ("%s"("ipv6_addrconf")){.+.+..}, at: [<ffffffff8118ad3e>] work_static include/linux/workqueue.h:186 [inline]
 #0:  ("%s"("ipv6_addrconf")){.+.+..}, at: [<ffffffff8118ad3e>] set_work_data kernel/workqueue.c:617 [inline]
 #0:  ("%s"("ipv6_addrconf")){.+.+..}, at: [<ffffffff8118ad3e>] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0:  ("%s"("ipv6_addrconf")){.+.+..}, at: [<ffffffff8118ad3e>] process_one_work+0x6ee/0x1500 kernel/workqueue.c:2085
 #1:  ((addr_chk_work).work){+.+...}, at: [<ffffffff8118ad78>] process_one_work+0x728/0x1500 kernel/workqueue.c:2089
 #2:  (rtnl_mutex){+.+.+.}, at: [<ffffffff830b1837>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
2 locks held by khungtaskd/519:
 #0:  (rcu_read_lock){......}, at: [<ffffffff813646ec>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813646ec>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81423bc0>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
3 locks held by kworker/0:2/1832:
 #0:  ("events_power_efficient"){.+.+.+}, at: [<ffffffff8118ad3e>] work_static include/linux/workqueue.h:186 [inline]
 #0:  ("events_power_efficient"){.+.+.+}, at: [<ffffffff8118ad3e>] set_work_data kernel/workqueue.c:617 [inline]
 #0:  ("events_power_efficient"){.+.+.+}, at: [<ffffffff8118ad3e>] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0:  ("events_power_efficient"){.+.+.+}, at: [<ffffffff8118ad3e>] process_one_work+0x6ee/0x1500 kernel/workqueue.c:2085
 #1:  ((reg_check_chans).work){+.+...}, at: [<ffffffff8118ad78>] process_one_work+0x728/0x1500 kernel/workqueue.c:2089
 #2:  (rtnl_mutex){+.+.+.}, at: [<ffffffff830b1837>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
1 lock held by rsyslogd/3534:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d567c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3639:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f2822>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff8211cc32>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
2 locks held by syz-executor0/9183:
 #0:  (net_mutex){+.+.+.}, at: [<ffffffff83058fb5>] copy_net_ns+0x155/0x290 net/core/net_namespace.c:406
 #1:  (rtnl_mutex){+.+.+.}, at: [<ffffffff830b1837>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
1 lock held by syz-executor0/9260:
 #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff830b1837>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
1 lock held by syz-executor0/9261:
 #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff830b1837>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
1 lock held by syz-executor0/9269:
 #0:  (net_mutex){+.+.+.}, at: [<ffffffff83058fb5>] copy_net_ns+0x155/0x290 net/core/net_namespace.c:406
1 lock held by syz-executor7/9194:
 #0:  (net_mutex){+.+.+.}, at: [<ffffffff83058fb5>] copy_net_ns+0x155/0x290 net/core/net_namespace.c:406
1 lock held by syz-executor7/9262:
 #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff830b1837>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
1 lock held by syz-executor7/9265:
 #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff830b1837>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
1 lock held by syz-executor7/9268:
 #0:  (net_mutex){+.+.+.}, at: [<ffffffff83058fb5>] copy_net_ns+0x155/0x290 net/core/net_namespace.c:406
1 lock held by syz-executor7/9273:
 #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff830b1837>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
1 lock held by syz-executor7/9276:
 #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff830b1837>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
2 locks held by syz-executor6/9204:
 #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff830b1837>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
 #1:  (ipvs->sync_mutex){+.+.+.}, at: [<ffffffff832df74d>] do_ip_vs_set_ctl+0x90d/0xbd0 net/netfilter/ipvs/ip_vs_ctl.c:2397
1 lock held by syz-executor6/9242:
 #0:  (ipvs->sync_mutex){+.+.+.}, at: [<ffffffff832df485>] do_ip_vs_set_ctl+0x645/0xbd0 net/netfilter/ipvs/ip_vs_ctl.c:2402
1 lock held by ipvs-b:8:0/9245:
 #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff830b1837>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70

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

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.99-gc2f9bce #22
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d965fd08 ffffffff81eb0f09 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b7da0 ffff8801d965fd40
 ffffffff81ebc207 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb0f09>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb0f09>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebc207>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebc19a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b7ea4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81364c84>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81364c84>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81364c84>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81364c84>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119ad5d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f481c>] 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 4.9.99-gc2f9bce #22
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9a6b000 task.stack: ffff8801d9a80000
RIP: 0010:[<ffffffff811e76ef>] 
c [<ffffffff811e76ef>] decay_load kernel/sched/fair.c:2772 [inline]
RIP: 0010:[<ffffffff811e76ef>] 
c [<ffffffff811e76ef>] __update_load_avg kernel/sched/fair.c:2906 [inline]
RIP: 0010:[<ffffffff811e76ef>] 
c [<ffffffff811e76ef>] update_cfs_rq_load_avg+0x77f/0x1f10 kernel/sched/fair.c:3291
RSP: 0018:ffff8801db307c90  EFLAGS: 00000093
RAX: 0000000002259047 RBX: ffff8801db321c20 RCX: 000000000000001f
RDX: 0000000000000365 RSI: ffff8801db321c80 RDI: 0000000000000004
RBP: ffff8801db307d30 R08: 0000000000000001 R09: 0000000000000004
R10: 000000000000009b R11: 0000000000000000 R12: 000000000000001f
R13: 0000000000000000 R14: ffff8801db321ce8 R15: ffff8801db321c88
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9be533a95f CR3: 00000001c9a13000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff810cccf3
c ffff8801db307ca8
c ffff8801d9a6b000
c ffffed003b34d718
c
 ffff8801d9a6b8c8
c ffff8801db321b98
c 0000000000000000
c 0000000000000c1f
c
 ffffffff8122e3f2
c 0000000000000003
c 0000000000000004
c 0000000000000004
c
Call Trace:
 [<ffffffff811f019a>] update_blocked_averages+0x26a/0x520 kernel/sched/fair.c:8201
 [<ffffffff812058b4>] rebalance_domains+0xe4/0xbc0 kernel/sched/fair.c:10075
 [<ffffffff81206689>] run_rebalance_domains+0x2f9/0x510 kernel/sched/fair.c:10332
 [<ffffffff839fb23b>] __do_softirq+0x20b/0x937 kernel/softirq.c:284
 [<ffffffff81149037>] invoke_softirq kernel/softirq.c:364 [inline]
 [<ffffffff81149037>] irq_exit+0x147/0x190 kernel/softirq.c:405
 [<ffffffff839f8de1>] smp_reschedule_interrupt+0x71/0x90 arch/x86/kernel/smp.c:270
 [<ffffffff839f6950>] reschedule_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:671
 <EOI> 
d [<ffffffff839f3286>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53
 [<ffffffff839f28c5>] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline]
 [<ffffffff839f28c5>] default_idle+0x55/0x360 arch/x86/kernel/process.c:295
 [<ffffffff81069fa0>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:286
 [<ffffffff839f36e5>] default_idle_call+0x45/0x60 kernel/sched/idle.c:97
 [<ffffffff81220e65>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff81220e65>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff81220e65>] cpu_startup_entry+0x2b5/0x380 kernel/sched/idle.c:303
 [<ffffffff810ad1f3>] start_secondary+0x323/0x400 arch/x86/kernel/smpboot.c:254
Code: 
c4c 
c89 
c64 
c24 
c38 
c48 
c89 
c7c 
c24 
c48 
c48 
c83 
cc7 
c01 
c49 
c89 
ccc 
c48 
c81 
cff 
ce0 
c07 
c00 
c00 
c48 
c89 
c7c 
c24 
c58 
c0f 
c87 
cb2 
c09 
c00 
c00 
c48 
c83 
cff 
c1f 
c89 
c7c 
c24 
c50 
c<0f> 
c87 
c37 
c0b 
c00 
c00 
c48 
cba 
c00 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
c8b 
c4c 
c24 
c58 
c48 
c