id	summary	reporter	owner	description	type	status	component	version	resolution	keywords	cc	guest	host
16291	Guest SuSe 13.2 freezes on Host Windows 7 when more than 1 processor (core2 quad) is assigned	neumannd		"This issue is similar to that in [https://www.virtualbox.org/ticket/7619 ticket 7619]. However, the issue occurs with a recent VirtualBox version.

When more than 1 processor is assigned to the Guest (Open SuSe 13.2, XFCE Desktop) it freezes after some time and does not react anymore (commonly after below 1 hour). VirtualBox itself still runs. Pausing the VM or Saving it to the Disk (and resuming) works fine but the Guest is still frozen. The Host is Windows 7 SP1.

When I assign 1 processor it works fine (I worked for 2 month with this 1-processor-setup and experienced some performance problems recently, which is way I came back testing a >1 processor setup. But this is not the topic of this ticket).

3D acceleration is not enabled. The issue seems to be correlating with the usage of Mozilla Firefox and/or Thunderbird - but not exclusively. The freezes occured also without Firefox running (but less ofter). 

The host computer has a Core2 Quad Q9400 Processor. It does not support hyper-threading. I could assign up 8 cores in the settings dialog. I mention this because I found some discussion on whether cores or virtual processes are assigned. Idependent whether the processor supports hyper-threading or not, there should be only 4 cores available.

Currently, I am using VirtualBox v5.1.10 but the issue occured also in v5.1.6 and v5.1.8.

Since the number of Core2 processors is declining this issue probably has a quite low priority."	defect	new	other	VirtualBox 5.1.10		core2quad freeze hang		Linux	Windows