Invalid read of size 1
   at 0x........: ddd (errs1.c:7)
   by 0x........: ccc (errs1.c:8)
   by 0x........: bbb (errs1.c:9)
   by 0x........: aaa (errs1.c:10)
   by 0x........: main (errs1.c:17)
 Address 0x........ is 1 bytes before a block of size 10 alloc'd
   at 0x........: malloc (vg_replace_malloc.c:...)
   by 0x........: zzzzzzz (errs1.c:12)
   by 0x........: yyy (errs1.c:13)
   by 0x........: xxx (errs1.c:14)
   by 0x........: www (errs1.c:15)
   by 0x........: main (errs1.c:17)

Invalid write of size 1
   at 0x........: ddd (errs1.c:7)
   by 0x........: ccc (errs1.c:8)
   by 0x........: bbb (errs1.c:9)
   by 0x........: aaa (errs1.c:10)
   by 0x........: main (errs1.c:17)
 Address 0x........ is 1 bytes before a block of size 10 alloc'd
   at 0x........: malloc (vg_replace_malloc.c:...)
   by 0x........: zzzzzzz (errs1.c:12)
   by 0x........: yyy (errs1.c:13)
   by 0x........: xxx (errs1.c:14)
   by 0x........: www (errs1.c:15)
   by 0x........: main (errs1.c:17)