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Ticket Resolution Summary Owner Reporter
#15356 worksforme VirtualBox reboots CentOS 6.5 (disabling VMXE at CR4) vboxtrial
Description

I have installed VirtualBox 5.0.16 on CentOS 6.5 using the following commands under root:

yum-config-manager --add-repo http://download.virtualbox.org/virtualbox/rpm/el/virtualbox.repo
yum install VirtualBox-5.0

The server is headless, has no UI/Desktop manager installed, run-level 3.

Important thing is that I run qemu/kvm virtual machine on that server. It uses the hardware virtualization, but I still expect VirtualBox to be able to run in software virtualization mode, so I set

VBoxManage modifyvm testvm --hwvirtex off
VBoxHeadless --startvm testvm

But when I start such VM (under root or non-root user) , the host instantly reboots[[BR]]

No VBox.log is generates, no /var/log/messages entries.

The /var/crashes/<date>/vmcore ~700Mb and vmcore-dmesg.txt files are generated - should they be helpful in the investigation of the issue, tell me and I will find a way to deliver it to you. Or tell me how to extract info from that.

The following Vargant config reproduces the problem for me and might be convenient if you want to reproduce the issue:

Vagrant.configure("2") do |config|
  config.vm.box = "ubuntu/trusty32"
  config.vm.hostname = "mybox"
  config.vm.network :private_network, ip: "192.168.0.42"

  config.vm.provider :virtualbox do |vb|
    vb.customize ["modifyvm", :id, "--hwvirtex", "off"]
  end
end

Note1: I have found some alike issues #12923 and #14278, but they appear to be UI(QT) related or other version of CentOS and not rebooting the host and not resolved

Note2: Why would it reboot the host OS instead of "just" segfault as described in other tickets?

Note3: tested with Win and Linux guests - same result - instant host reboot

#15354 fixed Xorg doesn't start when User Password is not set on Ubuntu -> fixed in versions greater than 5.0.20 Aweman
Description

Host: Windows 10 - 64bit (10586.218) Guest: Ubuntu 16.04 - 64bit Virtualbox: 5.0.18 with 5.0.18_106667 Additions

Hello,

my normal settings for User Accounts in Ubuntu are: I use a password and automatic Login (Screenshot 1.jpg) For test reasons i deleted my password and switched automatic login off (Screenshot 2.jpg)

After a Ubuntu restart with these settings the Xorg Server didn't come up any more. After I uninstalled the Guest Additions from the terminal the Xorg Server started again.

I reproduced the behaviour a few times. With no password and automatic login off and the guest additions installed, I can not start Ubuntu.

#15349 obsolete Graphic crash - referenced memory could not be written rje
Description

Hi. Both Ubuntu 16.06 & Mint guests on a Windows 10 host keep crashing.

When running Visual Studio Code or Atom the screen freezes. When I tried on Ubuntu to switch workspace (before even installing either) the whole VM died with the error shown in the attached screenshot.

I've attached logs too. Please suggest anything you can think of that I could try. I've set my host graphics card to always be Nvidia, as people say the Intel onboard one is error-prone.

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