On Fri, Sep 26, 2014 at 11:58 AM, Josh Boyer <jwboyer@xxxxxxxxxxxxxxxxx> wrote: > On Fri, Sep 26, 2014 at 2:53 PM, Andrew Lutomirski <luto@xxxxxxx> wrote: >> On Fri, Sep 26, 2014 at 11:37 AM, Hans de Goede <hdegoede@xxxxxxxxxx> wrote: >>> Hi All, >>> >>> Just spend some time debugging this and thought I should share this, see: >>> >>> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=762195 >>> >>> for details, I've filed a bug to track fixing this in Fedora: >>> >>> https://bugzilla.redhat.com/show_bug.cgi?id=1147062 >>> >>> There are 2 ways this problem shows itself: >>> >>> 1) If using an initrd which has been generated with the troublesome microcode >>> update into it, things may already crash during the initrd, e.g. in my case >>> some luks volumes would not unlock because of this >>> >>> 2) When booting an older kernel (and thus an older initrd) things start crashing >>> (mostly systemd* processes, grinding everything to a halt) as soon as udev >>> from the rootfs loads the microcode update >>> >>> 2. often will still get you to an emergency shell, at which point one can >>> create a /etc/modprobe.conf.d/no_microcode.conf file with: >>> >>> blacklist microcode >>> >>> In there to work around the problem, then regenerate the initrds for newer >>> kernels, and you should be good to go until bug 1147062 gets fixed properly. >> >> Yeah, sorry, I should have tried to notify the right Fedora people in advance. > > I knew about it. This is basically a breakdown in communication > between the kernel people and the microcode_ctl owner. it was > compounded by the fact that I didn't realize our main dracut > maintainer was on PTO so I didn't fix dracut myself until this > morning. > >> This is a nasty issue, and no one knows how to solve it for real yet. >> See this long thread: >> >> http://thread.gmane.org/gmane.linux.kernel/1790211 > > Yeah. FWIW, I just filed an update to have Fedora use early microcode > by default. A COPR of this was tested successfully by a few people > that had the Haswell issue. > > https://admin.fedoraproject.org/updates/dracut-038-29.git20140903.fc21,kernel-3.16.3-302.fc21 Everyone will still crash their system once, though, unless microcode_ctl learns to blacklist this particular update. Oh, well. --Andy > > josh > -- > devel mailing list > devel@xxxxxxxxxxxxxxxxxxxxxxx > https://admin.fedoraproject.org/mailman/listinfo/devel > Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct
