==127171== Memcheck, a memory error detector
==127171== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==127171== Using Valgrind-3.15.0 and LibVEX; rerun with -h for copyright info
==127171== Command: ./double_free
==127171== 
==127171== Invalid read of size 1
==127171==    at 0x4006CE: print_string (double_free.c:12)
==127171==    by 0x400705: main (double_free.c:19)
==127171==  Address 0x5205040 is 0 bytes inside a block of size 4 free'd
==127171==    at 0x4C2B06D: free (vg_replace_malloc.c:540)
==127171==    by 0x40067D: repeat_char (double_free.c:7)
==127171==    by 0x4006F5: main (double_free.c:18)
==127171==  Block was alloc'd at
==127171==    at 0x4C29F73: malloc (vg_replace_malloc.c:309)
==127171==    by 0x400635: repeat_char (double_free.c:2)
==127171==    by 0x4006F5: main (double_free.c:18)
==127171== 
==127171== Invalid read of size 1
==127171==    at 0x4006AD: print_string (double_free.c:13)
==127171==    by 0x400705: main (double_free.c:19)
==127171==  Address 0x5205040 is 0 bytes inside a block of size 4 free'd
==127171==    at 0x4C2B06D: free (vg_replace_malloc.c:540)
==127171==    by 0x40067D: repeat_char (double_free.c:7)
==127171==    by 0x4006F5: main (double_free.c:18)
==127171==  Block was alloc'd at
==127171==    at 0x4C29F73: malloc (vg_replace_malloc.c:309)
==127171==    by 0x400635: repeat_char (double_free.c:2)
==127171==    by 0x4006F5: main (double_free.c:18)
==127171== 
==127171== Invalid free() / delete / delete[] / realloc()
==127171==    at 0x4C2B06D: free (vg_replace_malloc.c:540)
==127171==    by 0x400711: main (double_free.c:20)
==127171==  Address 0x5205040 is 0 bytes inside a block of size 4 free'd
==127171==    at 0x4C2B06D: free (vg_replace_malloc.c:540)
==127171==    by 0x40067D: repeat_char (double_free.c:7)
==127171==    by 0x4006F5: main (double_free.c:18)
==127171==  Block was alloc'd at
==127171==    at 0x4C29F73: malloc (vg_replace_malloc.c:309)
==127171==    by 0x400635: repeat_char (double_free.c:2)
==127171==    by 0x4006F5: main (double_free.c:18)
==127171== 
@@@==127171== 
==127171== HEAP SUMMARY:
==127171==     in use at exit: 0 bytes in 0 blocks
==127171==   total heap usage: 1 allocs, 2 frees, 4 bytes allocated
==127171== 
==127171== All heap blocks were freed -- no leaks are possible
==127171== 
==127171== For lists of detected and suppressed errors, rerun with: -s
==127171== ERROR SUMMARY: 8 errors from 3 contexts (suppressed: 0 from 0)