~/pset4/speller/ $ help50 valgrind  ./speller texts/a.txt
==12968== Memcheck, a memory error detector
==12968== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==12968== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
==12968== Command: ./speller texts/a.txt
==12968==

MISSPELLED WORDS

==12968== Invalid read of size 8
==12968==    at 0x401409: check (dictionary.c:150)
==12968==    by 0x400C39: main (speller.c:113)
==12968==  Address 0x522d090 is 80 bytes inside a block of size 224 free'd
==12968==    at 0x4C30D3B: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==12968==    by 0x401350: load (dictionary.c:130)
==12968==    by 0x400914: main (speller.c:41)
==12968==  Block was alloc'd at
==12968==    at 0x4C2FB0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==12968==    by 0x401114: load (dictionary.c:71)
==12968==    by 0x400914: main (speller.c:41)
==12968==
==12968== Invalid read of size 8
==12968==    at 0x40143E: check (dictionary.c:154)
==12968==    by 0x400C39: main (speller.c:113)
==12968==  Address 0x522d090 is 80 bytes inside a block of size 224 free'd
==12968==    at 0x4C30D3B: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==12968==    by 0x401350: load (dictionary.c:130)
==12968==    by 0x400914: main (speller.c:41)
==12968==  Block was alloc'd at
==12968==    at 0x4C2FB0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==12968==    by 0x401114: load (dictionary.c:71)
==12968==    by 0x400914: main (speller.c:41)
==12968==
jjiji
hru
gg
==12968== Invalid read of size 8
==12968==    at 0x401025: erase (dictionary.c:35)
==12968==    by 0x401384: unload (dictionary.c:167)
==12968==    by 0x400DB9: main (speller.c:153)
==12968==  Address 0x522d048 is 8 bytes inside a block of size 224 free'd
==12968==    at 0x4C30D3B: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==12968==    by 0x401350: load (dictionary.c:130)
==12968==    by 0x400914: main (speller.c:41)
==12968==  Block was alloc'd at
==12968==    at 0x4C2FB0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==12968==    by 0x401114: load (dictionary.c:71)
==12968==    by 0x400914: main (speller.c:41)
==12968==
==12968== Invalid read of size 8
==12968==    at 0x401039: erase (dictionary.c:37)
==12968==    by 0x401384: unload (dictionary.c:167)
==12968==    by 0x400DB9: main (speller.c:153)
==12968==  Address 0x522d048 is 8 bytes inside a block of size 224 free'd
==12968==    at 0x4C30D3B: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==12968==    by 0x401350: load (dictionary.c:130)
==12968==    by 0x400914: main (speller.c:41)
==12968==  Block was alloc'd at
==12968==    at 0x4C2FB0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==12968==    by 0x401114: load (dictionary.c:71)
==12968==    by 0x400914: main (speller.c:41)
==12968==
==12968== Invalid read of size 8
==12968==    at 0x40104E: erase (dictionary.c:39)
==12968==    by 0x401384: unload (dictionary.c:167)
==12968==    by 0x400DB9: main (speller.c:153)
==12968==  Address 0x522d048 is 8 bytes inside a block of size 224 free'd
==12968==    at 0x4C30D3B: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==12968==    by 0x401350: load (dictionary.c:130)
==12968==    by 0x400914: main (speller.c:41)
==12968==  Block was alloc'd at
==12968==    at 0x4C2FB0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==12968==    by 0x401114: load (dictionary.c:71)
==12968==    by 0x400914: main (speller.c:41)
==12968==

WORDS MISSPELLED:     3
WORDS IN DICTIONARY:  143091
WORDS IN TEXT:        3
TIME IN load:         3.48
TIME IN check:        0.04
TIME IN size:         0.00
TIME IN unload:       4.66
TIME IN TOTAL:        8.18

==12968==
==12968== HEAP SUMMARY:
==12968==     in use at exit: 0 bytes in 0 blocks
==12968==   total heap usage: 510,180 allocs, 510,180 frees, 88,819,322 bytes allocated
==12968==
==12968== All heap blocks were freed -- no leaks are possible
==12968==
==12968== For counts of detected and suppressed errors, rerun with: -v
==12968== ERROR SUMMARY: 86 errors from 5 contexts (suppressed: 0 from 0)

Asking for help...

==12968== Invalid read of size 8
==12968==    at 0x401409: check (dictionary.c:150)
==12968==    by 0x400C39: main (speller.c:113)

Looks like you're trying to access 8 bytes of memory that isn't yours? Did you try to index into an array beyond its bounds? Take a closer look at line 150 of dictionary.c.