Ruh roh - major vulnerability in use of SMT ("hyperthreads") with Intel CPUs, and suspected AMD may be vulnerable too. (Why we should never allow a monoculture to develop.) OpenBSD set to disable HT in upcoming releases. Better to disable HT in the BIOS. https://www.zdnet.com/article/intel-cpus-impacted-by-new-portsmash-side-channel-vulnerability/