Invalid write of size 1
   at 0x........: really (malloc1.c:20)
   by 0x........: main (malloc1.c:9)
   by 0x........: __libc_start_main (...libc...)
   by 0x........: ...
   Address 0x........ is 1 bytes inside a block of size 10 free'd
   at 0x........: free (vg_replace_malloc.c:...)
   by 0x........: really (malloc1.c:19)
   by 0x........: main (malloc1.c:9)
   by 0x........: __libc_start_main (...libc...)

Invalid write of size 1
   at 0x........: really (malloc1.c:23)
   by 0x........: main (malloc1.c:9)
   by 0x........: __libc_start_main (...libc...)
   by 0x........: ...
   Address 0x........ is 1 bytes before a block of size 10 alloc'd
   at 0x........: malloc (vg_replace_malloc.c:...)
   by 0x........: really (malloc1.c:21)
   by 0x........: main (malloc1.c:9)
   by 0x........: __libc_start_main (...libc...)

ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)
malloc/free: in use at exit: 10 bytes in 1 blocks.
malloc/free: 2 allocs, 1 frees, 20 bytes allocated.
For a detailed leak analysis,  rerun with: --leak-check=yes
For counts of detected errors, rerun with: -v