Starting program: /home/user/Pulpit/a.out 
[Thread debugging using libthread_db enabled]
[New Thread 0xb7fd8b70 (LWP 6067)]
[New Thread 0xb76abb70 (LWP 6068)]
a.out: malloc.c:3096: sYSMALLOc: Assertion `(old_top == (((mbinptr) (((char *) &((av)->bins[((1) - 1) * 2])) - __builtin_offsetof (struct malloc_chunk, fd)))) && old_size == 0) || ((unsigned long) (old_size) >= (unsigned long)((((__builtin_offsetof (struct malloc_chunk, fd_nextsize))+((2 * (sizeof(size_t))) - 1)) & ~((2 * (sizeof(size_t))) - 1))) && ((old_top)->size & 0x1) && ((unsigned long)old_end & pagemask) == 0)' failed.

Program received signal SIGABRT, Aborted.
0x0012e416 in __kernel_vsyscall ()
(gdb) bt
#0  0x0012e416 in __kernel_vsyscall ()
#1  0x00394e71 in raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#2  0x0039834e in abort () at abort.c:92
#3  0x003d5b74 in __malloc_assert (assertion=<value optimized out>, file=<value optimized out>, line=3096, 
    function=0x4a15ab "sYSMALLOc") at malloc.c:351
#4  0x003d826b in sYSMALLOc (av=0x4c83c0, bytes=20737) at malloc.c:3093
#5  _int_malloc (av=0x4c83c0, bytes=20737) at malloc.c:4747
#6  0x003d8f61 in _int_realloc (av=<value optimized out>, oldp=0x8068518, oldsize=13832, nb=20744) at malloc.c:5290
#7  0x003da579 in __libc_realloc (oldmem=0x8068520, bytes=20736) at malloc.c:3821
#8  0x0055fdd9 in _XimParseStringFile () from /usr/lib/i386-linux-gnu/libX11.so.6
#9  0x0055dc90 in _XimLocalOpenIM () from /usr/lib/i386-linux-gnu/libX11.so.6
#10 0x0055c0f5 in _XimOpenIM () from /usr/lib/i386-linux-gnu/libX11.so.6
#11 0x005408ca in XOpenIM () from /usr/lib/i386-linux-gnu/libX11.so.6
#12 0x001e0920 in ?? () from /usr/lib/liballeg.so.4.2