From the comments, it sounds like this is a regression in the kernel between versions 2.6.39.4 to 3.0.0-0300rc1. A git bisection search can be utilized to narrow in on where the regression occurred. Please see https://wiki.ubuntu.com/Kernel/KernelBisection
Reassigning to the kernel team for further follow up, since they'll need to ensure the faulty patch is backed out or replaced.
From the comments, it sounds like this is a regression in the kernel between versions 2.6.39.4 to 3.0.0-0300rc1. A git bisection search can be utilized to narrow in on where the regression occurred. Please see https:/ /wiki.ubuntu. com/Kernel/ KernelBisection
Reassigning to the kernel team for further follow up, since they'll need to ensure the faulty patch is backed out or replaced.