大量的rcuob进程

环境:

OS:Centos 7

问题,今天采购了一台dell R430机器，启动发现大量的如下进程
[root@localhost opt]# top
top - 02:07:57 up 6:39, 2 users, load average: 0.03, 0.04, 0.05
Tasks: 513 total, 1 running, 512 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.1 us, 0.1 sy, 0.0 ni, 99.8 id, 0.1 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem : 32532928 total, 15733336 free, 1034308 used, 15765284 buff/cache
KiB Swap: 67107836 total, 67107836 free, 0 used. 31152168 avail Mem

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
205 root 20 0 0 0 0 S 0.3 0.0 0:00.83 rcuos/3
14497 root 20 0 146612 2552 1460 R 0.3 0.0 0:00.03 top
1 root 20 0 44264 6820 2532 S 0.0 0.0 0:03.62 systemd
2 root 20 0 0 0 0 S 0.0 0.0 0:00.01 kthreadd
3 root 20 0 0 0 0 S 0.0 0.0 0:00.17 ksoftirqd/0
5 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0H
7 root rt 0 0 0 0 S 0.0 0.0 0:00.25 migration/0
8 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_bh
9 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/0
10 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/1
11 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/2
12 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/3
13 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/4
14 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/5
15 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/6
16 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/7
17 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/8
18 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/9
19 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/10
20 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/11
21 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/12
22 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/13
23 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/14
24 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/15
25 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/16
26 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/17
27 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/18
28 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/19
29 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/20
30 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/21
31 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/22
32 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/23
33 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/24
34 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/25
35 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/26
36 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/27
37 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/28
38 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/29
39 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/30
40 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/31
41 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/32
42 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/33
43 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/34
44 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/35
45 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/36
46 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/37
47 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/38
48 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/39
49 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/40
50 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/41
51 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/42
52 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/43
53 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/44
54 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/45
55 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/46
56 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/47
57 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/48
58 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/49
59 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/50
60 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/51

解决办法：
方法一：
vim /etc/default/grub,在GRUB_CMDLINE_LINUX这一行添加nr_cpus=2,然后grub2-mkconfig -o /boot/grub2/grub.cfg,重启。

方法二：升级内核
yum install kernel -y, 重启。

告警消失，done！
我这里采用的是办法二