Skylake bug confirmed

Mersenne Prime search has found a reproducible way to hang the CPU. Henk_NL writes:

The fatal combination seems to be:

- Skylake AND
- hyperthreading AND
- CpuSupportsFMA3=0. (only needed if you use the latest version of prime95, since previous version stem from before the introduction use FMA3 anyway)

There are people contemplating writing a piece of software based on prime95 that will simplify freezing the Skylake based on just a few instructions. Very scary indeed and further analysis of the downloadable code is required

https://communities.intel.com/mobile/mobile-access.jspa#jive-content?content=%2Fapi%2Fcore%2Fv3%2Fcontents%2F524553

Hopefully a microcode update will be issued soon.