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Re: Oracle Java 16.0.1 CPU usage 100% after kernel update to 4.19.0-17-amd64

w f wrote: 
> I locally host and maintain some Minecraft (Java) servers for my kids and their friends. This morning, I kicked everyone off the servers while I did some routine maintenance. I finished with a standard sudo apt update && sudo apt full-upgrade
> A few things were updated - PHP, a library or two, and the kernel from 4.19.0-16-amd64 to 4.19.0-17-amd64
> All went fine.
> After I was done, I rebooted the system and fired up the MC servers. As soon as a player joins an MC server, the CPU usage on all cores slams to 100% and stays there. The game is unplayable.
> Nothing has changed with regards to the versions of game server, game clients, or Java.
> Debian buster.Oracle Java 16.0.1
> Is there any way to downgrade back to 4.19.0-16-amd64 ... ?

Probably, but I can attest that


runs Minecraft servers perfectly well with that kernel, so
perhaps switching Java runtimes is a less drastic choice.


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