[vbox-dev] Pegged kernel_task with VirtualBox 4.1, makes system unresponsive

Mitchell Hashimoto mitchell.hashimoto at gmail.com
Thu Jul 21 14:56:41 PDT 2011

More info on this:

A co-worker with an Intel Core i7 did not see this issue.
I have a Core 2 Duo and was affected.
My coworker also has a Core 2 Duo and saw the same issue.

So this must be something related to Core 2 Duos. I've tried tweaking
various settings but haven't seen any improvement yet.


On Thu, Jul 21, 2011 at 12:59 PM, Mitchell Hashimoto <
mitchell.hashimoto at gmail.com> wrote:

> Hello,
> I've just cleanly installed Mac OS X 10.7.0 and VirtualBox 4.1. I've been
> creating new Ubuntu virtual machines and have been seeing issues with my
> kernel_task (pid 0) taking 100% CPU, making the rest of the system
> unresponsive for periods of time.
> I've slowly narrowed this down to a single reproducible case. It seems that
> whenever the "Unpacking" step is reached in an apt-get install, then
> kernel_task goes to 100%. I don't know much about virtualization internals
> but I would suspect that something is wrong with disk I/O reads.
> Has anyone seen this yet? I can reproduce it consistently, and this doesn't
> occur in 10.6.0.
> Best,
> Mitchell
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