Annotating `hiwater_rss` as `__data_racy` [3] should make KCSAN happy. Would this be an acceptable change? Another possibility would be making the update from `update_hiwater_rss` atomic, but it doesn't seem worth the potential slowdown. Let me know if my proposal works for you. Thanks! [1] https://syzkaller.appspot.com/bug?extid=73d65fc86d6338db5990 [2] https://syzkaller.appspot.com/bug?extid=31cd52ba68feee156393 [3] https://docs.kernel.org/dev-tools/kcsan.html#selective-analysis