Comment 26 for bug 614853

The patch posted above may be causing Bug #671001. The patch "fixes" this bug by simply checking for 0 before doing the division it does not address the underlying issue causing group->cpu_power to be 0 in the first place. So instead of oopsing at the divide by zero, the kernel continues until the underlying problem causes a different bug to surface.

To be clear this is just speculation that this might be the cause, and has not be verified yet.