#0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:44
        tid = <optimized out>
        ret = 0
        pd = <optimized out>
        old_mask = {__val = {0}}
        ret = <optimized out>
        pd = <optimized out>
        old_mask = <optimized out>
        ret = <optimized out>
        tid = <optimized out>
        ret = <optimized out>
        resultvar = <optimized out>
        resultvar = <optimized out>
        __arg3 = <optimized out>
        __arg2 = <optimized out>
        __arg1 = <optimized out>
        _a3 = <optimized out>
        _a2 = <optimized out>
        _a1 = <optimized out>
        __futex = <optimized out>
        resultvar = <optimized out>
        __arg3 = <optimized out>
        __arg2 = <optimized out>
        __arg1 = <optimized out>
        _a3 = <optimized out>
        _a2 = <optimized out>
        _a1 = <optimized out>
        __futex = <optimized out>
        __private = <optimized out>
        __oldval = <optimized out>
#1  __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78
No locals.
#2  __GI___pthread_kill (threadid=<optimized out>, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
No locals.
#3  0x00007f6fbcc42866 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
        ret = <optimized out>
#4  0x00007f6fbcc268b7 in __GI_abort () at ./stdlib/abort.c:79
        save_stage = 1
        act = {__sigaction_handler = {sa_handler = 0x20, sa_sigaction = 0x20}, sa_mask = {__val = {94238765518016, 20, 140727616159800, 0, 140117889917200, 94238765625616, 320, 140114718097650, 140117889736342, 94238765558000, 0, 206158430232, 140727616160256, 94214402605298, 94238764559856, 140117891280192}}, sa_flags = 264196, sa_restorer = 0x55b5ac1a9560}
#5  0x00007f6fbcc27750 in __libc_message (fmt=fmt@entry=0x7f6fbcdc3b34 "%s\n") at ../sysdeps/posix/libc_fatal.c:150
        ap = {{gp_offset = 16, fp_offset = 0, overflow_arg_area = 0x7ffdb3924240, reg_save_area = 0x7ffdb39241d0}}
        fd = 2
        list = <optimized out>
        nlist = <optimized out>
        cp = <optimized out>
#6  0x00007f6fbcca3c67 in malloc_printerr (str=str@entry=0x7f6fbcdc6d08 "malloc(): mismatching next->prev_size (unsorted)") at ./malloc/malloc.c:5765
No locals.
#7  0x00007f6fbcca69cc in _int_malloc (av=av@entry=0x7f6fbce5dca0 <main_arena>, bytes=bytes@entry=208) at ./malloc/malloc.c:4076
        next = <optimized out>
        iters = 708
        nb = <optimized out>
        idx = 14
        bin = <optimized out>
        victim = <optimized out>
        size = <optimized out>
        victim_index = <optimized out>
        remainder = <optimized out>
        remainder_size = <optimized out>
        block = <optimized out>
        bit = <optimized out>
        map = <optimized out>
        fwd = <optimized out>
        bck = <optimized out>
        tcache_unsorted_count = 708
        tcache_nb = <optimized out>
        tc_idx = 12
        return_cached = 1
        __PRETTY_FUNCTION__ = "_int_malloc"
#8  0x00007f6fbcca814d in __GI___libc_malloc (bytes=bytes@entry=208) at ./malloc/malloc.c:3329
        ar_ptr = 0x7f6fbce5dca0 <main_arena>
        victim = <optimized out>
        tbytes = <optimized out>
        tc_idx = <optimized out>
        __PRETTY_FUNCTION__ = "__libc_malloc"
#9  0x00007f6fbc61175f in _XEnq (dpy=dpy@entry=0x55b5ac108e30, event=event@entry=0x55b5ac2e3ed0) at ../../src/XlibInt.c:749
        qelt = 0x0
        type = <optimized out>
        extension = <optimized out>
#10 0x00007f6fbc613a67 in handle_response (dpy=dpy@entry=0x55b5ac108e30, response=0x55b5ac2e3ed0, in_XReply=in_XReply@entry=0) at ../../src/xcb_io.c:417
        async = <optimized out>
        next = <optimized out>
#11 0x00007f6fbc613afa in _XEventsQueued (dpy=0x55b5ac108e30, mode=<optimized out>) at ../../src/xcb_io.c:442
        response = <optimized out>
#12 0x00007f6fbc606687 in XPending (dpy=0x55b5ac108e30) at ../../src/Pending.c:55
        ret_val = <optimized out>
#13 0x00007f6fbd38fa8d in gdk_check_xpending (display=0x55b5ac120530) at ../../../gdk/x11/gdkeventsource.c:269
No locals.
#14 gdk_event_source_check (source=source@entry=0x55b5ac14cf30) at ../../../gdk/x11/gdkeventsource.c:306
        event_source = 0x55b5ac14cf30
        retval = <optimized out>
#15 0x00007f6fbcf96908 in g_main_context_check_unlocked (context=0x55b5ac14cfb0, max_priority=<optimized out>, fds=<optimized out>, n_fds=<optimized out>) at ../../../glib/gmain.c:4171
        begin_time_nsec = 0
        result = <optimized out>
        check = 0x7f6fbd38fa30 <gdk_event_source_check>
        tmp_list = <optimized out>
        pollfd = <optimized out>
        source = 0x55b5ac14cf30
        iter = {context = 0x55b5ac14cfb0, may_modify = 1, current_list = 0x55b5ac14cef0, source = 0x55b5ac14cf30}
        pollrec = <optimized out>
        n_ready = <optimized out>
        i = <optimized out>
        __func__ = "g_main_context_check_unlocked"
#16 0x00007f6fbcff1388 in g_main_context_iterate_unlocked.isra.0 (context=0x55b5ac14cfb0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:4346
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 3
        allocated_nfds = 4
        fds = 0x55b5ac122a50
        begin_time_nsec = 0
#17 0x00007f6fbcf9646f in g_main_loop_run (loop=0x55b5ac1a2d30) at ../../../glib/gmain.c:4551
        self = <optimized out>
        __func__ = "g_main_loop_run"
#18 0x000055b5aa259b96 in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/gnome-flashback-3.49.1-1ubuntu1/daemons/polkit/gf-polkit-main.c:211
        autostart_id = <optimized out>
        polkit = 0x55b5ac1a3100