Linux has become one of the most important software to run the social infrastructure systems (SI system) such as power plants, water distribution and traffic control. From computer system viewpoint, the controllers require a very high level of real-time performance, reliability and security to avoid serious failure. To overcome the issues to apply Linux on SI systems, as the first step, we need to gather the actual requirements. Past few months, some companies who are interested in this area actually got together and discussed to put those requirements together. The requirements arose, for example, include the recovery time for redundant systems (less than a few milliseconds) etc. In this talk, I would like to share the current status of this requirement discussion and our future collaboration plan. Please join us to improve Linux together and make the world better place!