# valgrind ./a.out
==31275== Memcheck, a memory error detector
==31275== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==31275== Using Valgrind-3.12.0 and LibVEX; rerun with -h for copyright info
==31275== Command: ./a.out
==31275==
==31275== Conditional jump or move depends on uninitialised value(s)
==31275==    at 0x4011E14: index (in /usr/lib/ld-2.23.so)
==31275==
==31275== Conditional jump or move depends on uninitialised value(s)
==31275==    at 0x4011E18: index (in /usr/lib/ld-2.23.so)
==31275==
==31275== Conditional jump or move depends on uninitialised value(s)
==31275==    at 0x4005A5A: expand_dynamic_string_token (in /usr/lib/ld-2.23.so)
==31275==
==31275== Invalid write of size 4
==31275==    at 0x103EA: f (test_valgrind.c:6)
==31275==    by 0x103FB: main (test_valgrind.c:11)
==31275==  Address 0x4947050 is 0 bytes after a block of size 40 alloc'd
==31275==    at 0x483FD48: malloc (in /usr/lib/valgrind/vgpreload_memcheck-arm-linux.so)
==31275==
==31275==
==31275== HEAP SUMMARY:
==31275==     in use at exit: 40 bytes in 1 blocks
==31275==   total heap usage: 1 allocs, 0 frees, 40 bytes allocated
==31275==
==31275== LEAK SUMMARY:
==31275==    definitely lost: 40 bytes in 1 blocks
==31275==    indirectly lost: 0 bytes in 0 blocks
==31275==      possibly lost: 0 bytes in 0 blocks
==31275==    still reachable: 0 bytes in 0 blocks
==31275==         suppressed: 0 bytes in 0 blocks
==31275== Rerun with --leak-check=full to see details of leaked memory
==31275==
==31275== For counts of detected and suppressed errors, rerun with: -v
==31275== Use --track-origins=yes to see where uninitialised values come from
==31275== ERROR SUMMARY: 4 errors from 4 contexts (suppressed: 0 from 0)