Developers. Testers wanted immediately for: https://admin.fedoraproject.org/updates/glibc-2.18-16.fc20 and https://admin.fedoraproject.org/updates/glibc-2.20-4.fc21 For Fedora 21 and Fedora 20 we will be disabling Intel TSX support in POSIX threads effective immediately. This disabling of TSX support in POSIX threads is in order to prevent users from crashing their systems when they upgrade microcode_ctl. The upgrade to the new microcode_ctl applies the microcode update for the Intel errata HSW136 and makes all TSX instructions invalid opcodes. This means that any process on your system already using POSIX threads, and already using TSX, will fault with invalid opcode errors when it tries to execute TSX instructions. The best solution is for the microcode update to be done before userspace starts as part of a single-threaded init process or something similar. Until we support updating microcode in early bootup we won't enable TSX in POSIX threads. The glibc maintainers have decided not add code to detect which devices the errata applies to, nor will code be added to re-read the cpuid values at every TSX usage. We are going with the simples approach which is to disable TSX for POSIX threads. Cheers, Carlos. -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct
