Description of problem: Fedora 23 quickly dies with a kernel panic Version-Release number of selected component (if applicable): 4.2.8-300.fc23.x86_64 (I think; the issue was observed both with the 23-10 Workstation live CD and a failed but functional upgrade from F22 to F23 Workstation a few days ago) How reproducible: Always within a few minutes of boot, often within seconds Steps to Reproduce: 1. Boot Fedora 23 on my laptop 2. Do anything moderately resource-intensive (dnf operations are usually good), or just wait Actual results: Kernel panic Expected results: Normal operation Additional info: The affected laptop is a Sager NP8651, basically a rebadged Clevo P650SE. A Clevo P650SA that I own runs Fedora 23 fine. Notably, the affected laptop has the same CPU (Core i7-5700HQ) as the one in this report of the same kernel panic on the Arch Linux forums: https://bbs.archlinux.org/viewtopic.php?id=203010
More info from the kernel bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=103351 This seems to be a firmware bug triggered by glibc use of certain processor features that are incorrectly advertised by the processor. Apparently all that's needed is an early-mode firmware update.
Further data point: downloading and applying the Intel firmware update package for my CPU allowed me to successfully upgrade to and use Fedora 23 (and use F23 and CoreOS virtual machines under F22 before I upgraded, which had also triggered the problem).
Thanks for letting us know.