Created attachment 163071 [details] dmesg output from a successful 3.18 boot 3.19 kernels having been hanging for me during boot for one of my machines. This is still happening as of commit dc9319f5a3e1f67d2a2fbf190e30f6d03f569fed (post rc3). The problem first happens with commit ad4a362635353f7ceb66f4038269770fee1025fa. I tried reverting ad4a362635353f7ceb66f4038269770fee1025fa from dc9319f5a3e1f67d2a2fbf190e30f6d03f569fed, but there were conflicts and I don't know enough to properly resolve them. The hang is early enough that I can't get logging output from the boot. I have filed a bug at freedesktop.org for this as well: https://bugs.freedesktop.org/show_bug.cgi?id=88262
This is fixed in mainline now. The fix ( c7e873f85fb60b1af589ac1b0c62353cfe0bbb29) came in while the build I was doing to see if it was fixed in mainline, before filing the bug, was running. I didn't check back for more fixes included in mainline after the build was finished and before filing the bug.