https://bugs.freedesktop.org/show_bug.cgi?id=100726
--- Comment #9 from hiwatari.seiji@gmail.com --- My last try of bisecting the error. I'm pretty sure I've got the correct commit this time. I first ran 4 Weeks on the 4.9-rc1 without the error ever appearing, upgraded to one or two release candidates higher, rebooted and instantly had the error. I then did the bisecting in this window, waiting 3-4 Weeks for the error to appear per commit, before flagging the kernel as ok.
Git then tells me, that 5f7f8f6edbf860abf18149a64be036d4be5e2993 is the first bad commit. I will attach the new bisect log. I don't know if the error might already have been fixed, since I've been months on this ancient version. But I will try that in the following weeks.