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Old 08-11-2018, 09:18 AM   #1
Fred Caro
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Recent update causes high cpu usage


I am currently running Mint 18.3 initially installed with KDE, now usually run Xfce and have done so for a while without problems until a recent update. Now the cpu is racing away at an average of about 25%, this is shared over 6 processors. It has nothing running apart from the Xfce gui. Usually this would only average about 0.1 to 2% but it runs at 25% unless I run top which (without me doing anything else) seems to quell the enthusiasm of the offending processes and usage returns to normal, providing I don't shutdown top.

The offending processes have been:
systemd
gvfsd
systemctl

but not all at once, i, e, only one at once. (as reported by top)

Also it will behave itself if I don't login from the splash page but give Ctrl+Alt+F1 login from a terminal and give startx to start Xfce.
This behavior also happens with KDE.

Does anyone know why this is happening?
 
Old 08-11-2018, 02:31 PM   #2
business_kid
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Have you let it sit, come back, and look at top then?
 
Old Yesterday, 04:29 PM   #3
Fred Caro
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Yes and all appears well until I shutdown top then cpu usage creeps up to the same level. If I leave the system running without top, for say an hour it will be at about 50% and nothing is running apart from Xfce.

I have to leave top running if I want to keep cpu usage at normal levels.


Thanks for reply,

Fred.
 
Old Yesterday, 07:01 PM   #4
syg00
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I would be looking very closely for something like a mining malware sneaking around. I'm sure I saw something a while back about one that kept a lookout for things that could monitor it.
Try ps (without top running) and see if anything looks suspect.
 
Old Today, 06:15 AM   #5
business_kid
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Another sneaky trick is to copy top to a different name
Code:
cp top chrome
Then run "chrome"
 
  


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