#0  0x00007fcb61074117 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
        resultvar = 0
        pid = 19754
        selftid = 19754
#1  0x00007fcb61075808 in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x1, sa_sigaction = 0x1}, sa_mask = {__val = {140511503782616, 2, 140511506821349, 0, 41610720, 2, 0, 1, 0, 140511507018088, 1, 0, 140511506894179, 61281888, 140735909766000, 140735909766144}}, sa_flags = 41610720, sa_restorer = 0x8f06}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007fcb610b5fd4 in __libc_message (do_abort=do_abort@entry=1, fmt=fmt@entry=0x7fcb611bfba8 "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/posix/libc_fatal.c:175
        ap = {{gp_offset = 40, fp_offset = 0, overflow_arg_area = 0x7fffa1e8a560, reg_save_area = 0x7fffa1e8a4f0}}
        fd = 2
        on_2 = <optimized out>
        list = <optimized out>
        nlist = <optimized out>
        cp = <optimized out>
        written = <optimized out>
#3  0x00007fcb610bd5e6 in malloc_printerr (ptr=<optimized out>, str=0x7fcb611bfd48 "free(): invalid next size (fast)", action=1) at malloc.c:4996
        buf = "0000000002a15c60"
        cp = <optimized out>
#4  _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) at malloc.c:3840
        size = <optimized out>
        fb = <optimized out>
        nextchunk = <optimized out>
        nextsize = <optimized out>
        nextinuse = <optimized out>
        prevsize = <optimized out>
        bck = <optimized out>
        fwd = <optimized out>
        errstr = <optimized out>
        locked = <optimized out>
#5  0x00007fcb51a4ac0c in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
No symbol table info available.
#6  0x00007fcb519deb2e in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
No symbol table info available.
#7  0x00007fcb519df6ac in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
No symbol table info available.
#8  0x00007fcb5198f840 in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
No symbol table info available.
#9  0x00007fcb51c06e86 in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
No symbol table info available.
#10 0x00007fcb51ba8163 in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
No symbol table info available.
#11 0x00007fcb5c3b2c1f in ?? () from /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1
No symbol table info available.
#12 0x00007fcb5c38bc09 in glXDestroyContext () from /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1
No symbol table info available.
#13 0x00007fcb61436529 in ?? () from /usr/lib/x86_64-linux-gnu/libgldi.so.3
No symbol table info available.
#14 0x00007fcb6142569f in gldi_object_unref () from /usr/lib/x86_64-linux-gnu/libgldi.so.3
No symbol table info available.
#15 0x00007fcb61443913 in ?? () from /usr/lib/x86_64-linux-gnu/libgldi.so.3
No symbol table info available.
#16 0x00007fcb62450850 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#17 0x00007fcb61445a13 in cairo_dock_reset_docks_table () from /usr/lib/x86_64-linux-gnu/libgldi.so.3
No symbol table info available.
#18 0x000000000040ee92 in main ()
No symbol table info available.