[Bug 103351] Machine check exception on Broadwell quad-core with SpeedStep enabled

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https://bugzilla.kernel.org/show_bug.cgi?id=103351

--- Comment #46 from Henrique de Moraes Holschuh <hmh@hmh.eng.br> ---
Alexey,

Thank you very much for confirming that TSX-NI in Broadwell-H is still broken
*and active* on microcode 0x12, dated 2015-06-19.

I highly recommend that you deploy early microcode updates on your system. 
When you use the late microcode update mode, you are still at risk of hitting
errata that would be fixed by the microcode update.

Also, when you don't do an "early" update, the kernel won't know about any
"processor feature" flags change caused by the microcode update (yes, this is a
known bug): it will continue to operate with the set of flags it got from the
boot microcode for all intents and purposes (including, but not limited to
/proc/cpuinfo "flags" information being stale).

I'd also start pestering the motherboard vendor for firmware updates at least
every two months, or something to that effect :-(

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