Problems with memory files with paternal and child processes

Question

I have a program that needs to use mmf to map the ppm image in memory, and then each child will have to invert row by line in mmf. It says: "The MMF version must first create a copy of the image (and rename it in the name of the name of fate), and then invert on that copy." The semaphores are in the correct order and in accordance with the purpose, too.

From this, I encoded and gave me the correct result, but this happens: S. I do not understand why, but this is clearly not the case:

(...)
Inverting row... 
Done || 
Inverting row... 
Done || 
Cleaning up...
Closing file pointers.
*** glibc detected *** ./MMF_inverter: double free or corruption (!prev): 0x093a0170 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6(+0x6b591)[0x28e591]
/lib/tls/i686/cmov/libc.so.6(+0x6cde8)[0x28fde8]
/lib/tls/i686/cmov/libc.so.6(cfree+0x6d)[0x292ecd]
/lib/tls/i686/cmov/libc.so.6(fclose+0x14a)[0x27eaaa]
./MMF_inverter[0x80497d5]
/lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe6)[0x239bd6]
./MMF_inverter[0x8048d01]
======= Memory map: ========
00110000-00125000 r-xp 00000000 08:05 1569987    /lib/tls/i686/cmov/libpthread-2.11.1.so
00125000-00126000 r--p 00014000 08:05 1569987    /lib/tls/i686/cmov/libpthread-2.11.1.so
00126000-00127000 rw-p 00015000 08:05 1569987    /lib/tls/i686/cmov/libpthread-2.11.1.so
00127000-00129000 rw-p 00000000 00:00 0 
00129000-00146000 r-xp 00000000 08:05 1439060    /lib/libgcc_s.so.1
00146000-00147000 r--p 0001c000 08:05 1439060    /lib/libgcc_s.so.1
00147000-00148000 rw-p 0001d000 08:05 1439060    /lib/libgcc_s.so.1
00223000-00376000 r-xp 00000000 08:05 1569962    /lib/tls/i686/cmov/libc-2.11.1.so
00376000-00377000 ---p 00153000 08:05 1569962    /lib/tls/i686/cmov/libc-2.11.1.so
00377000-00379000 r--p 00153000 08:05 1569962    /lib/tls/i686/cmov/libc-2.11.1.so
00379000-0037a000 rw-p 00155000 08:05 1569962    /lib/tls/i686/cmov/libc-2.11.1.so
0037a000-0037d000 rw-p 00000000 00:00 0 
00459000-0045a000 r-xp 00000000 00:00 0          [vdso]
00471000-0048c000 r-xp 00000000 08:05 1440096    /lib/ld-2.11.1.so
0048c000-0048d000 r--p 0001a000 08:05 1440096    /lib/ld-2.11.1.so
0048d000-0048e000 rw-p 0001b000 08:05 1440096    /lib/ld-2.11.1.so
00905000-0090c000 r-xp 00000000 08:05 1569989    /lib/tls/i686/cmov/librt-2.11.1.so
0090c000-0090d000 r--p 00006000 08:05 1569989    /lib/tls/i686/cmov/librt-2.11.1.so
0090d000-0090e000 rw-p 00007000 08:05 1569989    /lib/tls/i686/cmov/librt-2.11.1.so
08048000-0804b000 r-xp 00000000 08:05 1458241    /home/neverMind/Desktop/SO-TP2/MMF/MMF_inverter
0804b000-0804c000 r--p 00002000 08:05 1458241    /home/neverMind/Desktop/SO-TP2/MMF/MMF_inverter
0804c000-0804d000 rw-p 00003000 08:05 1458241    /home/neverMind/Desktop/SO-TP2/MMF/MMF_inverter
093a0000-093c1000 rw-p 00000000 00:00 0          [heap]
b7700000-b7721000 rw-p 00000000 00:00 0 
b7721000-b7800000 ---p 00000000 00:00 0 
b781c000-b7855000 rw-s 00000000 08:05 1458172    /home/neverMind/Desktop/SO-TP2/MMF/out.ppm
b7855000-b7857000 rw-p 00000000 00:00 0 
b7862000-b7863000 rw-s 00000000 00:04 52069041   /SYSV00000000 (deleted)Aborted

Here is the code (it starts as. / Invert input_filename.ppm output_filename.ppm), it should be ppm:
main
functions c file
header file
makefile

, : ppm image p6

, , . ?

Answer 1

, . valgrind, .