================ Comment at: lib/sanitizer_common/sanitizer_allocator.h:1019 @@ -1018,1 +1018,3 @@ + return 0; + if (h->map_beg + page_size_ > p) return 0; ---------------- you've changed two checks but added one test did you run the asan tests? http://llvm-reviews.chandlerc.com/D624