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 josh -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct
