Valgrind 3.6.0 crashes on snow leopard

[VictorEijkhout (Victor Eijkhout)]

%% cc -g read.c              
%% valgrind a.out
valgrind: mmap(0x100000000, 4096) failed in UME (load_segment1).
%% cat read.c 
#include <stdlib.h>
 int main() {
 float *x,y;
 x = (float*)malloc(5*sizeof(float));
 y = x[5];
 return 0;
}