*** glibc detected *** ./prog21: double free or corruption (!prev): 0x09a132d8 ***

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*** glibc detected *** ./prog21: double free or corruption (!prev): 0x09a132d8 ***
======= Backtrace: =========
/lib/libc.so.6(+0x6c501)[0x17c501]
/lib/libc.so.6(+0x6dd70)[0x17dd70]
/lib/libc.so.6(cfree+0x6d)[0x180e5d]
/lib/libc.so.6(fclose+0x14a)[0x16c81a]
./prog21[0x804973a]
./prog21[0x80496bf]
/lib/libpthread.so.0(+0x5cc9)[0xd10cc9]
/lib/libc.so.6(clone+0x5e)[0x1e06ae]
======= Memory map: ========
00110000-00267000 r-xp 00000000 08:05 97773      /lib/libc-2.12.1.so
00267000-00268000 ---p 00157000 08:05 97773      /lib/libc-2.12.1.so
00268000-0026a000 r--p 00157000 08:05 97773      /lib/libc-2.12.1.so
0026a000-0026b000 rw-p 00159000 08:05 97773      /lib/libc-2.12.1.so
0026b000-0026e000 rw-p 00000000 00:00 0 
00551000-00552000 r-xp 00000000 00:00 0          [vdso]
008c9000-008e3000 r-xp 00000000 08:05 97807      /lib/libgcc_s.so.1
008e3000-008e4000 r--p 00019000 08:05 97807      /lib/libgcc_s.so.1
008e4000-008e5000 rw-p 0001a000 08:05 97807      /lib/libgcc_s.so.1
00a50000-00a6c000 r-xp 00000000 08:05 97749      /lib/ld-2.12.1.so
00a6c000-00a6d000 r--p 0001b000 08:05 97749      /lib/ld-2.12.1.so
00a6d000-00a6e000 rw-p 0001c000 08:05 97749      /lib/ld-2.12.1.so
00d0b000-00d20000 r-xp 00000000 08:05 97881      /lib/libpthread-2.12.1.so
00d20000-00d21000 ---p 00015000 08:05 97881      /lib/libpthread-2.12.1.so
00d21000-00d22000 r--p 00015000 08:05 97881      /lib/libpthread-2.12.1.so
00d22000-00d23000 rw-p 00016000 08:05 97881      /lib/libpthread-2.12.1.so
00d23000-00d25000 rw-p 00000000 00:00 0 
08048000-0804b000 r-xp 00000000 08:05 201310     /home/vedro/t1/prog21
0804b000-0804c000 r--p 00002000 08:05 201310     /home/vedro/t1/prog21
0804c000-0804d000 rw-p 00003000 08:05 201310     /home/vedro/t1/prog21
09a13000-09a34000 rw-p 00000000 00:00 0          [heap]
b6f00000-b6f21000 rw-p 00000000 00:00 0 
b6f21000-b7000000 ---p 00000000 00:00 0 
b70ca000-b70cb000 ---p 00000000 00:00 0 
b70cb000-b78cd000 rw-p 00000000 00:00 0 
b78d8000-b78dc000 rw-p 00000000 00:00 0 
bfab8000-bfad9000 rw-p 00000000 00:00 0          [stack]
Aborted