Hi, I just started using jemalloc, and one of our tests fail, because realloc with size=0 does malloc with size 1. from realloc spec at http://pubs.opengroup.org/onlinepubs/000095399/functions/realloc.html : If/size/is 0 and/ptr/is not a null pointer, the object pointed to is freed. Why does jemalloc chooses to behave differently? Yoni.