Invalid write of size 1
   at 0x........: main (describe-block.c:8)
 Address 0x........ is 0 bytes inside a magic foople zone of size 4,096 client-defined
   at 0x........: main (describe-block.c:6)


HEAP SUMMARY:
    in use at exit: ... bytes in ... blocks
  total heap usage: ... allocs, ... frees, ... bytes allocated

For a detailed leak analysis, rerun with: --leak-check=full

For counts of detected and suppressed errors, rerun with: -v
ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)