READ of size 1 at 0x.* thread T0
    #0 0x.* in main .*heap-overflow.cc:6
0x.* is located 0 bytes to the right of 10-byte region
allocated by thread T0 here:
    #0 0x.* in .*mz_malloc.* _asan_rtl_
    #1 0x.* in malloc_zone_malloc.*
    #2 0x.* in malloc.*
    #3 0x.* in main heap-overflow.cc:4