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.
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.