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mm_struct.hiwater_rss can be accessed concurrently without proper synchronization as reported by KCSAN. This data race is benign as it only affects accounting information. Annotate it with data_race() to make KCSAN happy. Link: https://lkml.kernel.org/r/20250331-mm-maxrss-data-race-v2-1-cf958e6205bf@iencinas.com Signed-off-by: Ignacio Encinas <ignacio@iencinas.com> Reported-by: syzbot+419c4b42acc36c420ad3@syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/67e3390c.050a0220.1ec46.0001.GAE@google.com/ Suggested-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Acked-by: Pedro Falcato <pfalcato@suse.de> Cc: Liam Howlett <liam.howlett@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>