2 at 0x........: realloc (vg_replace_malloc.c:...)
3 by 0x........: main (realloc_size_zero.c:11)
4 Address 0x........ is 0 bytes inside a block of size 1,024 alloc'd
5 at 0x........: malloc (vg_replace_malloc.c:...)
6 by 0x........: main (realloc_size_zero.c:8)
