Is a lack of testing for trusty going to prevent a patch for xenial/artful? We don't have any machines on trusty to test it with, but if it's going to block the whole patch then we might be able to wipe an affected machine and install trusty to test it.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1759920 Title: intel-microcode 3.20180312.0 causes lockup at login screen(w/ linux- image-4.13.0-37-generic) Status in intel-microcode package in Ubuntu: Invalid Status in linux package in Ubuntu: Invalid Status in intel-microcode source package in Trusty: Invalid Status in linux source package in Trusty: Fix Committed Status in intel-microcode source package in Xenial: Invalid Status in linux source package in Xenial: Fix Committed Status in intel-microcode source package in Artful: Invalid Status in linux source package in Artful: Fix Committed Bug description: [Impact] * Some systems experience kernel lockups after updating to the latest intel-microcode package or when receiving updated microcode from a BIOS update. * In many cases, the lockups occur before users can reach the login screen which makes it very difficult to debug/workaround. [Test Case] * The most reliable test case currently known is to install the sssd package. Lockups may occur during package installation (disable IBPB by writing 0 to /proc/sys/kernel/ibpb_enabled to prevent this from happening). A lockup will most likely occur just after booting the system up as the lock screen is displayed. [Regression Potential] * The fix is in the task switching code of the kernel so complexity of the change is relatively high. [Original Report] I don't know if this is a problem with the kernel or the microcode, but we have a significant number of computers in our organization (on both 16.04 and 17.10) that fail if they have both updated. Booting with either linux-image-4.13.0-36-generic or intel-microcode 3.20180108.0+really20170707ubuntu17.10.1 allows all these computers to boot. ## Workaround ## 1. Boot the system with the dis_ucode_ldr kernel boot parameter to temporary avoid the problem: https://wiki.ubuntu.com/Kernel/KernelBootParameters 2. Install the previous version of package from https://launchpad.net/~ubuntu-security-proposed/+archive/ubuntu/ppa/+build/14261530/+files/intel-microcode_3.20180108.0+really20170707ubuntu16.04.1_amd64.deb 3. (Optional) Hold the package so that it won't be upgraded accidentally sudo apt-mark hold intel-microcode To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/intel-microcode/+bug/1759920/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : email@example.com Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp