[arch-general] High CPU on one core, but unable to find process responsible

David Rosenstrauch darose at darose.net
Mon Mar 12 02:19:34 UTC 2018

My server's been exhibiting some very strange behavior lately.  Every 
couple of days I run into a situation where one core (core #0) on the 
quad core CPU starts continuously using around 34% of CPU, but I'm not 
able to see (using htop) any process that's responsible for using all 
that CPU.  Even when I tell htop to show me kernel threads too, I still 
am not able to see the offending process.  Every process remains under 
1% CPU usage (except for occasional, small, short-lived spikes up) yet 
the CPU usage on that core remains permanently hovering at around 34%.  
The problem goes away when I reboot, but then comes back with a day or 

I'm rather stumped as to how to fix this.  The server is a bit old, 
running an up-to-date installation of Arch on a Intel Core 2 Quad Q6600 
CPU.  Any suggestions anyone might have as to either what might be going 
on here, or how to go about debugging it would be greatly appreciated.



More information about the arch-general mailing list