==127069== Memcheck, a memory error detector
==127069== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==127069== Using Valgrind-3.15.0 and LibVEX; rerun with -h for copyright info
==127069== Command: ./invalid_read-after_free
==127069== 
==127069== Invalid read of size 1
==127069==    at 0x4006C2: print_string (invalid_read-after_free.c:11)
==127069==    by 0x400705: main (invalid_read-after_free.c:19)
==127069==  Address 0x5205040 is 0 bytes inside a block of size 4 free'd
==127069==    at 0x4C2B06D: free (vg_replace_malloc.c:540)
==127069==    by 0x4006F9: main (invalid_read-after_free.c:18)
==127069==  Block was alloc'd at
==127069==    at 0x4C29F73: malloc (vg_replace_malloc.c:309)
==127069==    by 0x400635: repeat_char (invalid_read-after_free.c:2)
==127069==    by 0x4006E9: main (invalid_read-after_free.c:17)
==127069== 
==127069== Invalid read of size 1
==127069==    at 0x4006A1: print_string (invalid_read-after_free.c:12)
==127069==    by 0x400705: main (invalid_read-after_free.c:19)
==127069==  Address 0x5205040 is 0 bytes inside a block of size 4 free'd
==127069==    at 0x4C2B06D: free (vg_replace_malloc.c:540)
==127069==    by 0x4006F9: main (invalid_read-after_free.c:18)
==127069==  Block was alloc'd at
==127069==    at 0x4C29F73: malloc (vg_replace_malloc.c:309)
==127069==    by 0x400635: repeat_char (invalid_read-after_free.c:2)
==127069==    by 0x4006E9: main (invalid_read-after_free.c:17)
==127069== 
@@@==127069== 
==127069== HEAP SUMMARY:
==127069==     in use at exit: 0 bytes in 0 blocks
==127069==   total heap usage: 1 allocs, 1 frees, 4 bytes allocated
==127069== 
==127069== All heap blocks were freed -- no leaks are possible
==127069== 
==127069== For lists of detected and suppressed errors, rerun with: -s
==127069== ERROR SUMMARY: 7 errors from 2 contexts (suppressed: 0 from 0)