Hi Matt, A kernel bug report was opened against Ubuntu [0]. After a kernel bisect, it was found that reverting the following commit resolved this bug: commit 1297667083d5442aafe3e337b9413bf02b114edb Author: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx> Date: Mon Sep 19 13:09:09 2016 +0100 x86/efi: Only map RAM into EFI page tables if in mixed-mode The regression was introduced as of v4.8-rc8. It also still affects current mainline. I was hoping to get your feedback, since you are the patch author. Do you think gathering any additional data will help diagnose this issue, or would it be best to submit a revert request? Thanks, Joe [0] http://pad.lv/1659340 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html