In chapter 4.9.2 At the ICN(HN-F) node CHI specification talks about what ICN should do when there is hazard condition. It says:

One example of these rules is chapter 5.6.1 CopyBack-Snoop hazard at RN-F, Figure 5-22 CopyBack-Snoop hazard at RN-F exa…

The purpose of Exclusive Access is to read, calculate and modify a cache line atomically. The built-in Atomic Transactions can do some basic calculations at ICN or SN, but if more complex operations are necessary, Exclusive Access is needed.

CHI specification…