This upstream bug looks related (affecting rdrand) but the instruction bytes are different:
https://bugs.kde.org/show_bug.cgi?id=353370 ** Bug watch added: KDE Bug Tracking System #353370 https://bugs.kde.org/show_bug.cgi?id=353370 ** Also affects: valgrind via https://bugs.kde.org/show_bug.cgi?id=353370 Importance: Unknown Status: Unknown ** No longer affects: valgrind -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1501545 Title: Valgrind fails on rdrand when the cpu supports it (haswell) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/valgrind/+bug/1501545/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs