IPVS: set_ctl: invalid protocol: 31912 1.136.255.255:58323 F
IPVS: set_ctl: invalid protocol: 64680 1.136.255.255:14502 F
IPVS: set_ctl: invalid protocol: 31912 1.136.255.255:2511 F
IPVS: set_ctl: invalid protocol: 31912 1.136.255.255:36793 F
IPVS: set_ctl: invalid protocol: 64680 1.136.255.255:9555 F
INFO: task init:7878 blocked for more than 120 seconds.
      Not tainted 4.9.42-g02f29ab #24
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
init            D28848  7878      1 0x00000000
 ffff8801cb2d4800 0000000000000000 ffff8801cf280000 ffffffff84426880
 ffff8801db221518 ffff8801d5c37798 ffffffff838945fb 0000000000000246
 ffff8801cb2d4800 0000000000000000 ffff8801db221e40 ffff8801db221e68
Call Trace:
 [<ffffffff83895bb2>] schedule+0x92/0x1b0 kernel/sched/core.c:3625
 [<ffffffff83896523>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3658
 [<ffffffff8389bb32>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff8389bb32>] mutex_lock_nested+0x312/0x870 kernel/locking/mutex.c:621
 [<ffffffff81ffd482>] tty_open_by_driver drivers/tty/tty_io.c:2030 [inline]
 [<ffffffff81ffd482>] tty_open+0x412/0xe00 drivers/tty/tty_io.c:2108
 [<ffffffff8157a32b>] chrdev_open+0x22b/0x4c0 fs/char_dev.c:392
 [<ffffffff81565587>] do_dentry_open+0x607/0xc60 fs/open.c:766
 [<ffffffff81569055>] vfs_open+0x105/0x220 fs/open.c:879
 [<ffffffff8159f4fc>] do_last fs/namei.c:3402 [inline]
 [<ffffffff8159f4fc>] path_openat+0x64c/0x2a60 fs/namei.c:3525
 [<ffffffff815a5107>] do_filp_open+0x197/0x290 fs/namei.c:3560
 [<ffffffff81569b32>] do_sys_open+0x352/0x4c0 fs/open.c:1072
 [<ffffffff81569ccd>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff81569ccd>] SyS_open+0x2d/0x40 fs/open.c:1085
 [<ffffffff838a5a05>] entry_SYSCALL_64_fastpath+0x23/0xc6
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 513 Comm: khungtaskd Not tainted 4.9.42-g02f29ab #24
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8f4fd00 ffffffff81d92909 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810bd020 ffff8801d8f4fd38
 ffffffff81d9da1d 0000000000000001 0000000000000000 ffff8801cb2d4c18
Call Trace:
 [<ffffffff81d92909>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d92909>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81d9da1d>] nmi_cpu_backtrace+0xfd/0x120 lib/nmi_backtrace.c:99
 [<ffffffff81d9db57>] nmi_trigger_cpumask_backtrace+0x117/0x190 lib/nmi_backtrace.c:60
 [<ffffffff810bd114>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff813722b0>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff813722b0>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff813722b0>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff813722b0>] watchdog+0x6f0/0xa70 kernel/hung_task.c:239
 [<ffffffff8119afbd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838a5caa>] ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:433
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 7876 Comm: init Not tainted 4.9.42-g02f29ab #24
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801cb2d3000 task.stack: ffff8801d13c0000
RIP: 0010:[<ffffffff82034c73>] 
c [<ffffffff82034c73>] outb arch/x86/include/asm/io.h:316 [inline]
RIP: 0010:[<ffffffff82034c73>] 
c [<ffffffff82034c73>] io_serial_out+0x73/0x90 drivers/tty/serial/8250/8250_port.c:420
RSP: 0018:ffff8801d13c75e8  EFLAGS: 00000002
RAX: 0000000000000035 RBX: 00000000000003f8 RCX: 0000000000000000
RDX: 00000000000003f8 RSI: 0000000000000000 RDI: ffffffff8615a178
RBP: ffff8801d13c7600 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 1ffff1003a278e96 R12: ffffffff8615a140
R13: 0000000000000035 R14: dffffc0000000000 R15: 0000000000000035
FS:  00007f3645f807a0(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd60ea632c CR3: 00000001cc523000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8615a140
c 0000000000000035
c ffffffff82036950
c ffff8801d13c7620
c
 ffffffff82036995
c ffffffff858a322b
c ffffffff8615a140
c ffff8801d13c7660
c
 ffffffff8201ea0c
c ffffffff858a326d
c ffffffff8615a140
c 1ffff1003a278ed5
c
Call Trace:
 [<ffffffff82036995>] serial_port_out include/linux/serial_core.h:262 [inline]
 [<ffffffff82036995>] serial8250_console_putchar+0x45/0x60 drivers/tty/serial/8250/8250_port.c:3105
 [<ffffffff8201ea0c>] uart_console_write+0xac/0xe0 drivers/tty/serial/serial_core.c:1855
 [<ffffffff82042380>] serial8250_console_write+0x2e0/0x850 drivers/tty/serial/8250/8250_port.c:3170
 [<ffffffff8202f7af>] univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:594
 [<ffffffff81265fa5>] call_console_drivers.isra.20.constprop.29+0x1a5/0x350 kernel/printk/printk.c:1589
 [<ffffffff81268bd5>] console_unlock+0x425/0xb20 kernel/printk/printk.c:2445
 [<ffffffff8126a025>] console_device+0x95/0xc0 kernel/printk/printk.c:2553
 [<ffffffff81ffd4a0>] tty_lookup_driver drivers/tty/tty_io.c:1986 [inline]
 [<ffffffff81ffd4a0>] tty_open_by_driver drivers/tty/tty_io.c:2031 [inline]
 [<ffffffff81ffd4a0>] tty_open+0x430/0xe00 drivers/tty/tty_io.c:2108
 [<ffffffff8157a32b>] chrdev_open+0x22b/0x4c0 fs/char_dev.c:392
 [<ffffffff81565587>] do_dentry_open+0x607/0xc60 fs/open.c:766
 [<ffffffff81569055>] vfs_open+0x105/0x220 fs/open.c:879
 [<ffffffff8159f4fc>] do_last fs/namei.c:3402 [inline]
 [<ffffffff8159f4fc>] path_openat+0x64c/0x2a60 fs/namei.c:3525
 [<ffffffff815a5107>] do_filp_open+0x197/0x290 fs/namei.c:3560
 [<ffffffff81569b32>] do_sys_open+0x352/0x4c0 fs/open.c:1072
 [<ffffffff81569ccd>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff81569ccd>] SyS_open+0x2d/0x40 fs/open.c:1085
 [<ffffffff838a5a05>] entry_SYSCALL_64_fastpath+0x23/0xc6
Code: 
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