.
Thread 4 (LWP 3434):
#0  0x00007f58d5ed88dd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f58d640eebc in g_main_context_poll (priority=2147483647, n_fds=2, fds=0x7f58b80008c0, timeout=-1, context=0x7f58da74b160) at /build/buildd/glib2.0-2.43.92/./glib/gmain.c:4103
        poll_func = 0x7f58d641e3e0 <g_poll>
#2  g_main_context_iterate (context=context@entry=0x7f58da74b160, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.43.92/./glib/gmain.c:3803
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 2
        allocated_nfds = 2
        fds = 0x7f58b80008c0
#3  0x00007f58d640efcc in g_main_context_iteration (context=0x7f58da74b160, may_block=may_block@entry=1) at /build/buildd/glib2.0-2.43.92/./glib/gmain.c:3869
        retval = <optimized out>
#4  0x00007f58d640f009 in glib_worker_main (data=<optimized out>) at /build/buildd/glib2.0-2.43.92/./glib/gmain.c:5618
No locals.
#5  0x00007f58d6435955 in g_thread_proxy (data=0x7f58da738a30) at /build/buildd/glib2.0-2.43.92/./glib/gthread.c:764
        thread = 0x7f58da738a30
#6  0x00007f58d61ae6aa in start_thread (arg=0x7f58c2232700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7f58c2232700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140019190933248, 1761190932598287348, 0, 140731646090031, 140019190933952, 0, -1819307377306309644, -1819263039058023436}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#7  0x00007f58d5ee3eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.
.
Thread 3 (LWP 3433):
#0  0x00007f58d5ed88dd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f58d640eebc in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f58bc0010c0, timeout=24939, context=0x7f58da2c4d30) at /build/buildd/glib2.0-2.43.92/./glib/gmain.c:4103
        poll_func = 0x7f58d641e3e0 <g_poll>
#2  g_main_context_iterate (context=context@entry=0x7f58da2c4d30, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.43.92/./glib/gmain.c:3803
        max_priority = 2147483647
        timeout = 24939
        some_ready = <optimized out>
        nfds = 1
        allocated_nfds = 1
        fds = 0x7f58bc0010c0
#3  0x00007f58d640efcc in g_main_context_iteration (context=context@entry=0x7f58da2c4d30, may_block=may_block@entry=1) at /build/buildd/glib2.0-2.43.92/./glib/gmain.c:3869
        retval = <optimized out>
#4  0x00007f58cba6c27d in dconf_gdbus_worker_thread (user_data=0x7f58da2c4d30) at dconf-gdbus-thread.c:82
        context = 0x7f58da2c4d30
#5  0x00007f58d6435955 in g_thread_proxy (data=0x7f58da30e5e0) at /build/buildd/glib2.0-2.43.92/./glib/gthread.c:764
        thread = 0x7f58da30e5e0
#6  0x00007f58d61ae6aa in start_thread (arg=0x7f58cadf2700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7f58cadf2700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140019337471744, 1761190932598287348, 0, 140731646088559, 140019337472448, 140019594186032, -1819291056430584844, -1819263039058023436}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#7  0x00007f58d5ee3eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.
.
Thread 2 (LWP 3432):
#0  0x00007f58d5ed88dd in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f58d640eebc in g_main_context_poll (priority=2147483647, n_fds=2, fds=0x7f58c40010e0, timeout=-1, context=0x7f58da286600) at /build/buildd/glib2.0-2.43.92/./glib/gmain.c:4103
        poll_func = 0x7f58d641e3e0 <g_poll>
#2  g_main_context_iterate (context=0x7f58da286600, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.43.92/./glib/gmain.c:3803
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 2
        allocated_nfds = 2
        fds = 0x7f58c40010e0
#3  0x00007f58d640f242 in g_main_loop_run (loop=0x7f58da286590) at /build/buildd/glib2.0-2.43.92/./glib/gmain.c:4002
        __FUNCTION__ = "g_main_loop_run"
#4  0x00007f58d6e74ae6 in gdbus_shared_thread_func (user_data=0x7f58da2865d0) at /build/buildd/glib2.0-2.43.92/./gio/gdbusprivate.c:274
        data = 0x7f58da2865d0
#5  0x00007f58d6435955 in g_thread_proxy (data=0x7f58da26bcf0) at /build/buildd/glib2.0-2.43.92/./glib/gthread.c:764
        thread = 0x7f58da26bcf0
#6  0x00007f58d61ae6aa in start_thread (arg=0x7f58cb5f3700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7f58cb5f3700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140019345864448, 1761190932598287348, 0, 140731646088303, 140019345865152, 140019593930192, -1819287758432572428, -1819263039058023436}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#7  0x00007f58d5ee3eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.
.
Thread 1 (LWP 3428):
#0  0x00007f58d6706f1f in g_type_check_instance_is_a (type_instance=0x7f58dac02f20, iface_type=<optimized out>) at /build/buildd/glib2.0-2.43.92/./gobject/gtype.c:4016
No locals.
#1  0x00007f58d79cb9e6 in gtk_tree_view_drag_motion (widget=0x7f58dac02f20, context=0x7f58da20feb0, x=-697400160, y=0, time=3659771024) at /build/buildd/gtk+3.0-3.14.9/./gtk/gtktreeview.c:7998
        empty = <optimized out>
        path = 0x0
        pos = 3665046976
        tree_view = <optimized out>
        suggested_action = (GDK_ACTION_LINK | GDK_ACTION_PRIVATE | unknown: 32576)
        target = 0x7f58da38a2e0
#2  0x00007f58da38a2e0 in ?? ()
No symbol table info available.
#3  0x00007f58da23ac90 in ?? ()
No symbol table info available.
#4  0x00007f58d7387e88 in ?? () from /tmp/apport_sandbox_bT0ai1/usr/lib/x86_64-linux-gnu/libgdk-3.so.0
No symbol table info available.
#5  0x00007f58da275300 in ?? ()
No symbol table info available.
#6  0x0000000000000000 in ?? ()
No symbol table info available.