Ubuntu Jaunty Alpha (running with ext4 and kde 4.2 desktop) freezes when copying files between ext4 partitions and simultaneously running a virtual machine in Virtualbox 2.1.4

Hi!

I am running Ubuntu 9.04 alpha, fully updated as at today. Three times today, my machine has frozen completely, and have had to do a hard reset. I do not know what package/component is to blame, so I will give a description of the circumstances; but first, a description of my machine:

It's a Gateway M-6820 laptop (Intel Core 2 Duo T5750; ATI Mobility Radeon HD 2600; ...). In lieu of a long description of the machine, I have attached the output of lshw, lspci -vvmm and a dmesg run right after booting.

The machine has 3 partitions, all of which have been converted to ext4 (tune2fs -O extents,uninit_bg,dir_index /dev/yourfilesystem, followed by a fsck) and are mounted as ext4. Two of the partions (home and a storage folder are mounted "defaults." Root is mounted "relatime,errors=remount-ro". This is not a clean install of Jaunty - the machine started with Intrepid Alpha 5 when it was new, and has been progressively upgraded, through the stable intrepid and not to the Jaunty alphas.

The circumstances: I run Windows XP Virtual machines in Virtualbox 2.1.4. My Virtualbox is not the virtualbox-ose of the Ubuntu repos, but a .deb from downloads.virtualbox.org. Virtualbox has been working fine for months. In the last fortnight (the period in which I have been running Jaunty alpha), I have had this specific version and it has continued to work fine. Over the last few days, I have noticed that when I am doing a large file copy (via the KDE4 tools) AND simultaneously running a Virtualbox machine, the machine freezes up halfway through the copy. That does not happen when I copy via the commandline tools. I am not sure about the significance of a running Virtualbox; it just happens to be on and in use when this bug bites me.

Let me also describe another "freeze" situation that's occuring on this machine (already reported as an independent bug): Suspend. The machine suspends fine. When I wake it up, it wakes up, resumes the desktop (including picking up the song that was playing right where it stopped and displaying the desktop) THEN freezes after a few seconds. My Xorg.conf is empty (i.e. autoconfigured display).

I will be happy to provide any more info that is needed to figure this out.

Best Regards,
Daniel Nyaga