https://www.theregister.co.uk/2018/01/15/meltdown_ics/

Patches for the Meltdown vulnerability are causing stability issues in industrial control systems.

SCADA vendor Wonderware admitted that Redmond's Meltdown patch made its Historian product wobble. "Microsoft update KB4056896 (or parallel patches for other Operating System) causes instability for Wonderware Historian and the inability to access DA/OI Servers through the SMC," an advisory on Wonderware's support site explains.