sure didnt... im not that skilled at patching. this systems not affected by the problem so im blindly going to make the patches & test to make sure its not wrench in the gear style.
https://bugs.gentoo.org/show_bug.cgi?id=495284
yup boots fine here with the patches installed.
this was VERY useful to me here
http://jungels.net/articles/diff-patch-ten-minutes.html
(and to think i'd been using those ugly LFS patch commands all this time)
regardless if MY exact case is your exact case or not... what ever is going on needs /etc/init.d/root ran before those.
udev looks like its causing your nightmare... its /etc/init.d/udev file shows its not got the root requirement.... need sysfs udev-mount uhhh and before fsck...
yeah totally disregard my postings... my bad, i thought i knew and realized i didn't....
post your kernel config.... and other goodies described on this page...
https://wiki.gentoo.org/wiki/Troubleshooting
id further research cgroup_root read only (on google) & /sys/fs/cgroup read only (again on google)