Multi VM crash!!!

[AleMono!]

Hi, i'm Ale from Italy
I've installed virtualbox on ubuntu 15 64 bit
I'm using a Windows 7 64 bit virtualized with virtualbox
When i try to run another vm, after 20/30 secs virtualbox automatically close the windows machine
Why? I would like to use the windows machine and another machine!
On my pc i've 8 gb of ram so i don't think that the problem is low memory
Can anyone help me?
Thanks

Ale

[mpack]

Please post a VM log file of the VM that fails. With the VM fully shut down, right click and "Show Log" in the GUI, save "VBox.log" (ONLY) to a zip, and attach the zip here.

[AleMono!]

Please post a VM log file of the VM that fails. With the VM fully shut down, right click and "Show Log" in the GUI, save "VBox.log" (ONLY) to a zip, and attach the zip here.

Hi! here is the zip file
Thank you
Ale

[socratis]

First and foremost, you're using the Ubuntu fork of VirtualBox. I'll give it a shot of replying to you, but if you want to continue this discussion you have to install the official VirtualBox from https://www.virtualbox.org/wiki/Downloads

This the first VM that you launched. If you have configured your 2nd VM with the same settings, yes, it's going to abort. Here is why:
- You assign 3072 MB RAM + 256 MB VRAM + overhead =~ 3.5GB, times 2 VMs =~ 7 GB. You're getting really close to what you have on your host. Your host is going to starve.
- You have 4 CPUs in your host. You assigned 4 vPCUs to the VM. Plus another 4 to the second VM? Well, you see the problem, right? Your host is definitely going to starve.

What you can do is to lower your VM's RAM to a max of 2048 (if not 1536), plus 128 VRAM. Take the number of vCPUs to 1. See if that works... Oh, and BTW, it's always a good idea to keep a system monitor open to watch your system.