id summary reporter owner description type status component version resolution keywords cc guest host 5159 3.0.6 and 3.0.8 memory leak? Mark "Host is Windows Server 2008 Standard with 4 gig ram. I have one guest that runs Vista 32 and one that runs Windows 7 Pro. Both are allocated 1 gig of ram with 12 mb video. Only one guest is running at a time. Upon initial startup Memory is consumed normally at a little over 1 gig consumed from the host. The guests are development environments and run Visual Studio 2008 pro. I can see the memory on the host going down as I load a project, do a build, run a project and publish a project. It nevers seems to get released. I thought memory was pre-allocated so why is it going back to the host for more? Eventually the host OS starts slowly becoming sluggish and the VM needs to be shutdown. For Example, with no vm's running. Host has 3137mb free. Start win 7 guest, mem on host goes down to 1627mb. Start Visual studio on guest, host goes to 1597mb free, load project host goes to 1492mb free, run project host goes to 1391mb free, publish project, host to 1224mb free. This pattern continues until host mem is low. Here's what I found interesting. If I restart the guest os, the memory does not return to the host and the instance of virtual box is never shutdown. If I do a shutdown on the guest, as soon as the virtualbox process terminates the memory is returned to the host. Not sure what else I can supply for info as there are no errors, just symptoms. But it happens on two different guests and two different versions of VirtualBox. " defect closed other VirtualBox 3.0.8 fixed Windows Windows