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Here is just a port of the previously posted patch to mingw which clearly has the same problems. 2025-04-16 Jakub Jelinek <jakub@redhat.com> PR libgcc/101075 PR libgcc/119796 * config/mingw/lock.c (libat_lock_n, libat_unlock_n): Start with computing how many locks will be needed and take into account ((uintptr_t)ptr % WATCH_SIZE). If some locks from the end of the locks array and others from the start of it will be needed, first lock the ones from the start followed by ones from the end.