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Wed
Asked: 2020-01-29 09:19:10 +0800 CST

CPU - 16 threads stuck at 100% [resolved]

  • 772

I use centos 8, mariadb 10.5, php 7.4

enter image description here

As you can see 16 threads are at 100% stucked there this very unsual normally my cpu are at 10-25% as constant.

here is a top image enter image description here

What is going on here ?

so looks like i didnt fix it it keeps coming back even after i disable redis

what is going on here ?

# crontab -l
0 8 * * * root /usr/bin/php /var/www/html/wp-cron.php and 

> # ls -la /tmp total 3888 drwxrwxrwt. 14 root  root     4096 Jan 28 21:51 . dr-xr-xr-x. 19 root  root     4096 Jan 20 16:35 .. drwxrwxrwt 
> 2 root  root     4096 Jan 20 11:55 .font-unix drwxr-xr-x   2 redis
> redis    4096 Jan 28 21:47 .ICEd-unix drwxrwxrwt   2 root  root    
> 4096 Jan 20 11:55 .ICE-unix
> -rwxr-xr-x   1 redis redis 3922304 Jan 28 21:47 kdevtmpfsi
> -rw-------   1 redis redis       0 Jan 28 18:00 linux.lock drwx------   3 root  root     4096 Jan 28 20:49
> systemd-private-ccaba531523740f8a142a533d87ffd1b-chronyd.service-pfLMOx
> drwx------   3 root  root     4096 Jan 28 20:49
> systemd-private-ccaba531523740f8a142a533d87ffd1b-httpd.service-ZsAdQu
> drwx------   3 root  root     4096 Jan 28 20:49
> systemd-private-ccaba531523740f8a142a533d87ffd1b-memcached.service-xg2hBP
> drwx------   3 root  root     4096 Jan 28 20:49
> systemd-private-ccaba531523740f8a142a533d87ffd1b-named.service-593azu
> drwx------   3 root  root     4096 Jan 28 20:49
> systemd-private-ccaba531523740f8a142a533d87ffd1b-php-fpm.service-fM8F4O
> drwx------   3 root  root     4096 Jan 28 20:49
> systemd-private-ccaba531523740f8a142a533d87ffd1b-postfix.service-Bf2p49
> drwxrwxrwt   2 root  root     4096 Jan 20 11:55 .Test-unix drwxrwxrwt 
> 2 root  root     4096 Jan 20 11:55 .X11-unix drwxrwxrwt   2 root  root
> 4096 Jan 20 11:55 .XIM-unix

kdevtmpfsi this is miner or something who knows using a simple hack he managed to get in server using redis and put his mining crap here or who know what it is.

How i stop this from ever happening again

centos centos8 redis cpu-usage mariadb

3 Answers

  1. That process is similar to a known crypto mining malware, are you using docker ? could you send the content of crontab -l and an ls -la /tmp

    • 1

  2. kill reddis process and let it relaunch because it has your CPU pegged at 100%. if you can, restart the machine.

    • 0
  3. Best Answer

    He got in via redis

    Solution: Use a strong password for redis and use protectedmode on

    How to get him out ? kill -9 pid and check /tmp, /var/tmp and delete his files and replace them with a same name file

    done

    • 0