Over the weekend, Microsoft rolled out out-of-band updates to disable mitigations for one of the Spectre attack variants because they can cause systems to become unstable. Microsoft was among the first companies that provided security updates for Meltdown and Spectre vulnerabilities, anyway, the patches caused severe issues to AMD architectures. The famous Linus Torvalds expressed in an email to the Linux Kernel mailing list his disappointment, he defined the Linux Spectre Patches UTTER GARBAGE”]
Source: http://securityaffairs.co/wordpress/68369/security/spectre-microsoft-patches.html