.
Thread 1 (Thread 1253):
#0  0x00007f32fc5f5d05 in raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
        resultvar = 0
        pid = <value optimized out>
        selftid = 1253
#1  0x00007f32fc5f9ab6 in abort () at abort.c:92
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x20000000a, sa_sigaction = 0x20000000a}, sa_mask = {__val = {140735076563920, 140735076568708, 10, 139856960445284, 3, 140735076563914, 6, 139856960445288, 2, 140735076563902, 2, 139856960436277, 1, 139856960445284, 3, 140735076563908}}, sa_flags = 12, sa_restorer = 0x7f32fc725b68}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f32fc62ed7b in __libc_message (do_abort=2, fmt=0x7f32fc7273e0 "*** glibc detected *** %s: %s: 0x%s ***\n") at ../sysdeps/unix/sysv/linux/libc_fatal.c:189
        ap = {{gp_offset = 40, fp_offset = 48, overflow_arg_area = 0x7fff703f0540, reg_save_area = 0x7fff703f0450}}
        ap_copy = {{gp_offset = 16, fp_offset = 48, overflow_arg_area = 0x7fff703f0540, reg_save_area = 0x7fff703f0450}}
        fd = 2
        on_2 = <value optimized out>
        list = <value optimized out>
        nlist = <value optimized out>
        cp = <value optimized out>
        written = <value optimized out>
#3  0x00007f32fc63aa8f in malloc_printerr (av=<value optimized out>, p=0x1b8d070) at malloc.c:6283
        buf = "0000000001b8d080"
        cp = <value optimized out>
#4  _int_free (av=<value optimized out>, p=0x1b8d070) at malloc.c:4795
        size = <value optimized out>
        fb = <value optimized out>
        nextchunk = <value optimized out>
        nextsize = <value optimized out>
        nextinuse = <value optimized out>
        prevsize = <value optimized out>
        bck = <value optimized out>
        fwd = <value optimized out>
        errstr = 0x7f32fc727718 "double free or corruption (fasttop)"
        __func__ = "_int_free"
#5  0x00007f32fc63e8e3 in __libc_free (mem=<value optimized out>) at malloc.c:3738
        ar_ptr = 0x7f32fc9621c0
        p = <value optimized out>
        hook = <value optimized out>
#6  0x000000000053fd19 in xf86freeScreenList (ptr=0x1b84220) at ../../../../hw/xfree86/parser/Screen.c:450
        prev = <value optimized out>
#7  0x00000000004864b4 in xf86freeConfig (p=0x1b84110) at ../../../../hw/xfree86/parser/read.c:309
No locals.
#8  0x0000000000486590 in xf86readConfigFile () at ../../../../hw/xfree86/parser/read.c:224
        token = <value optimized out>
        ptr = 0x1b84110
#9  0x000000000052a936 in xf86HandleConfigFile (autoconfig=<value optimized out>) at ../../../../hw/xfree86/common/xf86Config.c:2419
        filename = <value optimized out>
        dirname = <value optimized out>
        sysdirname = <value optimized out>
        filesearch = <value optimized out>
        dirsearch = <value optimized out>
        filefrom = <value optimized out>
        dirfrom = <value optimized out>
        scanptr = <value optimized out>
        singlecard = 0
        implicit_layout = 0
#10 0x00000000004705da in InitOutput (pScreenInfo=0x7f2080, argc=9, argv=0x7fff703f0968) at ../../../../hw/xfree86/common/xf86Init.c:363
        i = <value optimized out>
        j = <value optimized out>
        k = <value optimized out>
        scr_index = <value optimized out>
        was_blocked = 0
        modulelist = <value optimized out>
        optionlist = <value optimized out>
        screenpix24 = <value optimized out>
        pix24 = <value optimized out>
        pix24From = X_DEFAULT
        pix24Fail = 0
        autoconfig = 0
        configured_device = <value optimized out>
#11 0x0000000000421893 in main (argc=9, argv=<value optimized out>, envp=<value optimized out>) at ../../dix/main.c:205
        i = <value optimized out>
        alwaysCheckForInput = {0, 1}