CPU and RAM 100% when loading Webmin Dashboard

Webmin
1
SYSTEM INFORMATION
OS type and version DEBIAN12
Webmin version 2.303

Hi everyone,

I am struggling finding the root isue of this bug.
I am using up to date Debian 12 and Webmin package.

When loading the dashboard with system statistics, I notice that my server is freezing and get to 100% CPU usage and 100% RAM usage. After some time, webmin process gets killed by OOM detection and my server unfreezes.

I limited the CPU usage and RAM usage with systemd parameters to prevent my server to crash.

But, I am still using a non working Webmin instance.
I can do some things but not access terminal and viewing dashboard; then it seems to be a websocket issue.

I am using an Apache2 reverse proxy with configuration based on the FAQ.

I can reproduce the issue when loading this URL :
https://mydomain.com/webmin/sysinfo.cgi

But when I check all the logs, I don’t see anything related.
I also tried to remove and reinstall webmin package, but the issue is still there.

Can you give me with some hints to point to the root cause ?

Many thanks
Cheers

2

Turn that option off, it would appear that the theme runs that without checking that it’s already running my small server runs into the same problem i.e 500mb ram 1 cpu

3

It’s supposed to check a lock before starting a new instance. It’s a bug if you see more than one running.

4

The problem is that I need this to work, at least the Terminal feature, it’s my main use of Webmin and I won’t keep it if I cannot use that.

When looking at htop when reproducing the issue, I can see sysinfo.cgi and xhr.cgi running at maximum RAM/CPU usage, but there is only one instance of each.

5

And i guess you have restarted webmin and checked this still fails. That said you have not intimated whatever else is installed

6

Sure, as said I even tried to remove and reinstall Webmin.
I just use apache to point to various web services.

7

So you didn’t recommission the server and reinstall webmin ?

8

When that happens, could you run systemctl status webmin, find the sysinfo.cgi PID, and run strace -p <PID> to see what’s really happening behind the scenes?

Did this issue also happen for you on Webmin 2.202?

1 Like
9

Also, do you have Usermin installed?

10

Let’s focus on one problem at a time. If you have a problem with the Terminal, open a new topic about that problem. I wouldn’t expect the terminal to be all that large (I mean, it’s much bigger than using an ssh session to have a terminal, but it’s not huge (I see 23M resident and 78MB VSS on my Debian 12 system).

11

Thanks for your replies, I found the root cause !

When I run a strace -p I see a lot of openat /etc/mysql/conf.d like an infinite loop…

My file /etc/mysql/conf.d/mysql.cnf had this line :

!includedir /etc/mysql/conf.d/

So that’s it, removed it and restated mysql service make Webmin works normally.

Thanks for helping me pointing me to the right direction.

Cheers !

1 Like
12

Thats a bit scary, how would that happen?

13

Can you provide more details about what /etc/mysql/conf.d contained? And also what is the output of ls -lsd /etc/mysql/conf.d command?

14

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