The invalid memory access comes from the vhba module, which seems to be associated with cdemu and afaict isn't supported in natty. Is this something you installed yourself?
** Changed in: linux (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/745362 Title: BUG: unable to handle kernel NULL pointer dereference at (null) -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs