VirtualBox

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Ticket Resolution Summary Owner Reporter
#14896 obsolete 100% CPU Usage, unable to boot VMs on kernel 3.19 rfkrocktk-oracle
Description

I'm on Ubuntu 14.04 on kernel 3.19 as part of the Vivid HWE stack. I'm on the latest 5.0 release from your repository.

Regardless of the operating system, I've found a really nasty bug that keeps recurring. After installing an operating system, as soon as I reboot, the CPU locks to 100% and the machine never boots. I've demonstrated this with Windows 7 guests and Linux guests. I basically cannot use VirtualBox for this reason and it's incredibly annoying.

Happy to provide debugging information.

#3537 fixed 100% CPU load of events kernel thread triggered by virtualbox Chris Hemsing
Description

After starting virtualbox on a dual core machine, one of the events kernel threads (nicelevel: -5 !) gets 100% CPU all the time, i.e. occupying one core completely.

Further observations:

  1. This happens as soon as the guest os starts.
  2. It is also the case, when the guest os is idling.
  3. It does NOT depend on the guest operating system. Same with Windows XP as with some Linux flavour.

This is on Ubuntu Intrepid, version: 2.1.4-42893_Ubuntu_intrepid .

#877 obsolete 100% CPU load with Windows XP guest and iTunesHelper Nil
Description

Host: Ubuntu Gutsy i386 Guest: Windows XP Professional SP2

After installing iTunes 7.5 from Apple's website I have noticed that VirtualBox uses 100% of the CPU. This is a dual core system (Core Duo T2500 @ 2.0 GHz) so actually only one core at once is at 100%, but I suppose that it would use almost 100% on a single core machine. This obviously makes the machine heat up too. Since I'm new to VirtualBox and I've used it for less than a week, I was unsure about if the VM always used the 100% of the CPU or not, so I first tried to disable tickless (nohz=off) on the host and ACPI on the guest too but that didn't help. Then I noticed that if I logged off the session in the guest CPU usage dropped, so I deduced it should be a Windows process or service what was causing the problem and found it to be iTunesHelper, however in the Windows Task Manager CPU usage for iTunesHelper was around 0-2% as expected so I understand it is a virtual machine issue. After disabling iTunesHelper in the registry so it doesn't load at logon CPU usage was normal again. Then I switched back to ACPI and re-enabled tickless and everything is fine now with iTunesHelper disabled.

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