Comment 167 for bug 727620

@harry
I don't know if it means anything, but in newer kernels you may be unable to use that command, since /sys/kernel/debug may not be owned by you. A quick and dirty (if dangerous) solution would be to change the first line to
chown "username(:group)" /sys/kernel/debug/ -R
where username is again your username and :group is the optional argument for the group ownership of the folder

Back to the bug, though, I did note one related oops in 50 boots (looking through my logs). I did note when it happened - it did cause a boot failure, but I did not give the evergreen error. Rather I got the gart_set_page error. However, it didn't cause a kernel dump like in the bisects. I only believe that the gart_set_page error to be related because it does not show up in kernels which were susceptible to the evergreen_cp_start oops. This still does not explain the race condition.

FWIW I did some plotting out of the bisects on paper and found that if there was a commit that fixed the gart_set error it was between bisects 014 and 017.