IPVS: set_ctl: invalid protocol: 31912 1.136.255.255:33930 F
IPVS: set_ctl: invalid protocol: 31912 1.136.255.255:18806 F
IPVS: set_ctl: invalid protocol: 31912 1.136.255.255:43631 F
IPVS: set_ctl: invalid protocol: 31912 1.136.255.255:2705 F
IPVS: set_ctl: invalid protocol: 31912 1.136.255.255:52162 F
INFO: task init:7737 blocked for more than 120 seconds.
      Not tainted 4.9.41-g72a8dae #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
init            D28480  7737      1 0x00000000
 ffff8801d4f3b000 ffff8801d6eff480 ffff8801d5de8fc0 ffff8801d4f73000
 ffff8801db221518 ffff8801d533f798 ffffffff8389457b 0000000000000246
 ffff8801d4f3b000 0000000000000000 ffff8801db221e40 ffff8801db221e68
Call Trace:
 [<ffffffff83895b32>] schedule+0x92/0x1b0 kernel/sched/core.c:3625
 [<ffffffff838964a3>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3658
 [<ffffffff8389bab2>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff8389bab2>] mutex_lock_nested+0x312/0x870 kernel/locking/mutex.c:621
 [<ffffffff81ffd182>] tty_open_by_driver drivers/tty/tty_io.c:2030 [inline]
 [<ffffffff81ffd182>] tty_open+0x412/0xe00 drivers/tty/tty_io.c:2108
 [<ffffffff81579fcb>] chrdev_open+0x22b/0x4c0 fs/char_dev.c:392
 [<ffffffff81565227>] do_dentry_open+0x607/0xc60 fs/open.c:766
 [<ffffffff81568cf5>] vfs_open+0x105/0x220 fs/open.c:879
 [<ffffffff8159f19c>] do_last fs/namei.c:3402 [inline]
 [<ffffffff8159f19c>] path_openat+0x64c/0x2a60 fs/namei.c:3525
 [<ffffffff815a4da7>] do_filp_open+0x197/0x290 fs/namei.c:3560
 [<ffffffff815697d2>] do_sys_open+0x352/0x4c0 fs/open.c:1072
 [<ffffffff8156996d>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8156996d>] SyS_open+0x2d/0x40 fs/open.c:1085
 [<ffffffff838a5985>] entry_SYSCALL_64_fastpath+0x23/0xc6
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 514 Comm: khungtaskd Not tainted 4.9.41-g72a8dae #22
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d896fd00 ffffffff81d92609 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810bd020 ffff8801d896fd38
 ffffffff81d9d71d 0000000000000001 0000000000000000 ffff8801d4f3b418
Call Trace:
 [<ffffffff81d92609>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d92609>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81d9d71d>] nmi_cpu_backtrace+0xfd/0x120 lib/nmi_backtrace.c:99
 [<ffffffff81d9d857>] 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
 [<ffffffff81371fc0>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81371fc0>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81371fc0>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81371fc0>] watchdog+0x6f0/0xa70 kernel/hung_task.c:239
 [<ffffffff8119adcd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838a5c2a>] 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: 7739 Comm: init Not tainted 4.9.41-g72a8dae #22
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d4f3e000 task.stack: ffff8801d6c10000
RIP: 0010:[<ffffffff820348db>] 
c [<ffffffff820348db>] inb arch/x86/include/asm/io.h:316 [inline]
RIP: 0010:[<ffffffff820348db>] 
c [<ffffffff820348db>] io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:414
RSP: 0018:ffff8801d6c175a0  EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000005 RDI: ffffffff8615a178
RBP: ffff8801d6c175b0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 1ffff1003ad82e96 R12: ffffffff8615a140
R13: 0000000000000020 R14: fffffbfff0c2b46f R15: fffffbfff0c2b431
FS:  00007f6e1304f7a0(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f94464a7e78 CR3: 00000001d4dbf000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8615a140
c 000000000000270a
c ffff8801d6c17600
c ffffffff8203650e
c
 ffff8801d6c17638
c ffffffff8615a188
c ffffffff8615a37a
c ffffffff8615a140
c
 0000000000000020
c ffffffff82036650
c dffffc0000000000
c 0000000000000020
c
Call Trace:
 [<ffffffff8203650e>] serial_in drivers/tty/serial/8250/8250.h:111 [inline]
 [<ffffffff8203650e>] wait_for_xmitr+0x8e/0x1d0 drivers/tty/serial/8250/8250_port.c:2001
 [<ffffffff8203666f>] serial8250_console_putchar+0x1f/0x60 drivers/tty/serial/8250/8250_port.c:3104
 [<ffffffff8201e70c>] uart_console_write+0xac/0xe0 drivers/tty/serial/serial_core.c:1855
 [<ffffffff82042080>] serial8250_console_write+0x2e0/0x850 drivers/tty/serial/8250/8250_port.c:3170
 [<ffffffff8202f4af>] univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:594
 [<ffffffff81265db5>] call_console_drivers.isra.20.constprop.29+0x1a5/0x350 kernel/printk/printk.c:1589
 [<ffffffff812689e5>] console_unlock+0x425/0xb20 kernel/printk/printk.c:2445
 [<ffffffff81269e35>] console_device+0x95/0xc0 kernel/printk/printk.c:2553
 [<ffffffff81ffd1a0>] tty_lookup_driver drivers/tty/tty_io.c:1986 [inline]
 [<ffffffff81ffd1a0>] tty_open_by_driver drivers/tty/tty_io.c:2031 [inline]
 [<ffffffff81ffd1a0>] tty_open+0x430/0xe00 drivers/tty/tty_io.c:2108
 [<ffffffff81579fcb>] chrdev_open+0x22b/0x4c0 fs/char_dev.c:392
 [<ffffffff81565227>] do_dentry_open+0x607/0xc60 fs/open.c:766
 [<ffffffff81568cf5>] vfs_open+0x105/0x220 fs/open.c:879
 [<ffffffff8159f19c>] do_last fs/namei.c:3402 [inline]
 [<ffffffff8159f19c>] path_openat+0x64c/0x2a60 fs/namei.c:3525
 [<ffffffff815a4da7>] do_filp_open+0x197/0x290 fs/namei.c:3560
 [<ffffffff815697d2>] do_sys_open+0x352/0x4c0 fs/open.c:1072
 [<ffffffff8156996d>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8156996d>] SyS_open+0x2d/0x40 fs/open.c:1085
 [<ffffffff838a5985>] entry_SYSCALL_64_fastpath+0x23/0xc6
Code: 
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c