.
Thread 3 (LWP 3599):
#0  0xb7713424 in __kernel_vsyscall ()
No symbol table info available.
#1  0xb6bfbdcb in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#2  0xb6d822db in poll (__timeout=-1, __nfds=1, __fds=0xb3a00c68) at /usr/include/i386-linux-gnu/bits/poll2.h:46
No locals.
#3  g_poll (fds=0xb3a00c68, nfds=1, timeout=-1) at /build/buildd/glib2.0-2.36.0/./glib/gpoll.c:132
No locals.
#4  0xb6d736d0 in g_main_context_poll (n_fds=1, fds=0xb3a00c68, timeout=<optimized out>, context=0x959bc28, priority=<optimized out>) at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3995
        poll_func = <optimized out>
#5  g_main_context_iterate (context=context@entry=0x959bc28, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3696
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        allocated_nfds = <optimized out>
        fds = 0xb3a00c68
        nfds = 1
#6  0xb6d73831 in g_main_context_iteration (context=context@entry=0x959bc28, may_block=may_block@entry=1) at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3762
        retval = <optimized out>
#7  0xb4d58e80 in dconf_gdbus_worker_thread (user_data=0x959bc28) at dconf-gdbus-thread.c:81
        context = 0x959bc28
#8  0xb6d98fc3 in g_thread_proxy (data=0x9578b20) at /build/buildd/glib2.0-2.36.0/./glib/gthread.c:798
        thread = 0x9578b20
#9  0xb6cd3d78 in start_thread (arg=0xb43b5b40) at pthread_create.c:311
        __res = <optimized out>
        pd = 0xb43b5b40
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {-1227993088, 0, 4001536, -1271180632, -1233246090, 1520902771}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#10 0xb6c0b3de in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:131
No locals.
.
Thread 2 (LWP 3595):
#0  0xb7713424 in __kernel_vsyscall ()
No symbol table info available.
#1  0xb6bfbdcb in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#2  0xb6d822db in poll (__timeout=-1, __nfds=3, __fds=0xb44022c8) at /usr/include/i386-linux-gnu/bits/poll2.h:46
No locals.
#3  g_poll (fds=0xb44022c8, nfds=3, timeout=-1) at /build/buildd/glib2.0-2.36.0/./glib/gpoll.c:132
No locals.
#4  0xb6d736d0 in g_main_context_poll (n_fds=3, fds=0xb44022c8, timeout=<optimized out>, context=0x950acc0, priority=<optimized out>) at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3995
        poll_func = <optimized out>
#5  g_main_context_iterate (context=0x950acc0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3696
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        allocated_nfds = <optimized out>
        fds = 0xb44022c8
        nfds = 3
#6  0xb6d73c2b in g_main_loop_run (loop=0x950ac88) at /build/buildd/glib2.0-2.36.0/./glib/gmain.c:3895
        __PRETTY_FUNCTION__ = "g_main_loop_run"
#7  0xb6f66bca in gdbus_shared_thread_func (user_data=0x950aca8) at /build/buildd/glib2.0-2.36.0/./gio/gdbusprivate.c:278
        data = 0x950aca8
#8  0xb6d98fc3 in g_thread_proxy (data=0x9506a30) at /build/buildd/glib2.0-2.36.0/./glib/gthread.c:798
        thread = 0x9506a30
#9  0xb6cd3d78 in start_thread (arg=0xb4d32b40) at pthread_create.c:311
        __res = <optimized out>
        pd = 0xb4d32b40
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {-1227993088, 0, 4001536, -1261231448, 1721641079, 1520902771}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#10 0xb6c0b3de in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:131
No locals.
.
Thread 1 (LWP 3566):
#0  0xb7713424 in __kernel_vsyscall ()
No symbol table info available.
#1  0xb6b48b1f in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
        resultvar = <optimized out>
        resultvar = <optimized out>
        pid = -1228107776
        selftid = 3566
#2  0xb6b4c0b3 in __GI_abort () at abort.c:90
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x9c, sa_sigaction = 0x9c}, sa_mask = {__val = {3068309504, 3067703006, 158809088, 3077787648, 3068313600, 5, 3068310280, 3077711340, 3068314040, 3036968792, 1, 5, 0, 3067582256, 156602368, 1, 1, 3068309504, 156448920, 3067302516, 3214811900, 3067581883, 0, 3065118952, 3068309504, 3066859520, 3066860608, 3068309504, 156448920, 133, 3214811900, 3077736848}}, sa_flags = -1228106640, sa_restorer = 0xb6b4bf70 <__GI_abort>}
        sigs = {__val = {32, 0 <repeats 31 times>}}
#3  0xb6d9747a in g_assertion_message (domain=domain@entry=0xb75461b7 <gtk_text_view_accessible_set_run_attributes+1047> "$\004\350\342~\320\377\205\300u?\307D$\b\n", file=file@entry=0xb76175d8 <__PRETTY_FUNCTION__.39383+24> "_sort_column_id", line=line@entry=14130, func=func@entry=0xb761a64c "_URI", message=0x94d8c28 "assertion failed: (user_data == widget)") at /build/buildd/glib2.0-2.36.0/./glib/gtestutils.c:1912
        lstr = "14130\000\000\000\000\260\342\266\000\260\342\266,\026\331\266N\214M\t\332N\334\266\220\300]\t"
        s = 0x9533898 "\370;w\tp\224\314\266R:/build/buildd/gtk+3.0-3.7.12/./gtk/gtkwidget.c:14130:gtk_widget_unregister_window: assertion failed: (user_data == widget)"
#4  0xb6d97aaf in g_assertion_message_expr (domain=0xb75461b7 <gtk_text_view_accessible_set_run_attributes+1047> "$\004\350\342~\320\377\205\300u?\307D$\b\n", file=0xb76175d8 <__PRETTY_FUNCTION__.39383+24> "_sort_column_id", line=14130, func=0xb761a64c "_URI", expr=0xb7617436 "") at /build/buildd/glib2.0-2.36.0/./glib/gtestutils.c:1923
        s = <optimized out>
#5  0xb74d6aed in gtk_ui_manager_class_init (klass=0x94f1b98) at /build/buildd/gtk+3.0-3.6.4/./gtk/gtkuimanager.c:512
        gobject_class = 0x94f1b98
#6  gtk_ui_manager_class_intern_init (klass=0xb6cd87cf <__GI___pthread_getspecific+15>) at /build/buildd/gtk+3.0-3.6.4/./gtk/gtkuimanager.c:453
No locals.
#7  0xb6e2b000 in ?? () from /tmp/apport_sandbox_blZUad/lib/i386-linux-gnu/libglib-2.0.so.0
No symbol table info available.