#0  0x00007f5dafe5d037 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
        resultvar = 0
        pid = 6463
        selftid = 6463
#1  0x00007f5dafe60698 in __GI_abort () at abort.c:90
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x7fffb68e2c00, sa_sigaction = 0x7fffb68e2c00}, sa_mask = {__val = {32, 117, 140040428129429, 532575944709, 0, 117, 140040359562472, 41318640, 117, 4337776, 140040428156709, 0, 140040363472760, 0, 4294967295, 140040363472704}}, sa_flags = 0, sa_restorer = 0x20}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f5db0476576 in g_assertion_message (domain=domain@entry=0x420f3a "empathy", file=file@entry=0x421c3a "empathy-call-window.c", line=line@entry=511, func=func@entry=0x423070 <__PRETTY_FUNCTION__.96235> "add_video_preview_to_pipeline", message=<optimized out>) at /build/buildd/glib2.0-2.35.8/./glib/gtestutils.c:1912
        lstr = "511\000\377\177\000\000\220)\216\266\377\177\000\000P\253C\002\000\000\000\000\f B\000\000\000\000"
        s = 0x27678f0 ""
#3  0x00007f5db0476ad4 in g_assertion_message_expr (domain=domain@entry=0x420f3a "empathy", file=file@entry=0x421c3a "empathy-call-window.c", line=line@entry=511, func=func@entry=0x423070 <__PRETTY_FUNCTION__.96235> "add_video_preview_to_pipeline", expr=expr@entry=0x42200c "priv->video_input != NULL") at /build/buildd/glib2.0-2.35.8/./glib/gtestutils.c:1923
        s = <optimized out>
#4  0x0000000000414e5f in add_video_preview_to_pipeline (self=self@entry=0x22dd980) at empathy-call-window.c:511
        priv = 0x22ddb20
        preview = <optimized out>
        __PRETTY_FUNCTION__ = "add_video_preview_to_pipeline"
#5  0x0000000000417790 in display_video_preview (self=0x22dd980, display=0) at empathy-call-window.c:1237
        priv = 0x22ddb20
        __PRETTY_FUNCTION__ = "display_video_preview"
#6  0x00000000004177eb in empathy_call_window_set_send_video (window=window@entry=0x22dd980, state=state@entry=CAMERA_STATE_OFF) at empathy-call-window.c:4007
        priv = 0x22ddb20
        call = <optimized out>
        __PRETTY_FUNCTION__ = "empathy_call_window_set_send_video"
#7  0x000000000041840a in empathy_call_window_state_changed_cb (handler=<optimized out>, state=<optimized out>, reason=0x28ec4b0 "", self=0x22dd980) at empathy-call-window.c:3217
        priv = 0x22ddb20
        call = 0xf0e3b0
        can_send_video = 0
        __PRETTY_FUNCTION__ = "empathy_call_window_state_changed_cb"
#8  0x00007f5da59f8c18 in ffi_call_unix64 () at ../src/x86/unix64.S:76
No locals.
#9  0x00007f5da59f8580 in ffi_call (cif=cif@entry=0x7fffb68e2d00, fn=fn@entry=0x417e70 <empathy_call_window_state_changed_cb>, rvalue=0x7fffb68e2c60, avalue=avalue@entry=0x7fffb68e2c00) at ../src/x86/ffi64.c:522
        classes = {X86_64_INTEGER_CLASS, X86_64_NO_CLASS, 3062770816, 32767}
        stack = 0x7fffb68e2a50 "\bu\323"
        argp = 0x7fffb68e2b00 ""
        arg_types = 0x7fffb68e2c30
        gprcount = 4
        ssecount = <optimized out>
        ngpr = 1
        nsse = 0
        i = <optimized out>
        avn = <optimized out>
        ret_in_memory = <optimized out>
        reg_args = 0x7fffb68e2a50
#10 0x00007f5db07180ab in g_cclosure_marshal_generic (closure=0x25b5350, return_gvalue=0x0, n_param_values=<optimized out>, param_values=<optimized out>, invocation_hint=<optimized out>, marshal_data=0x417e70 <empathy_call_window_state_changed_cb>) at /build/buildd/glib2.0-2.35.8/./gobject/gclosure.c:1454
        rtype = <optimized out>
        rvalue = 0x7fffb68e2c60
        n_args = 4
        atypes = 0x7fffb68e2c30
        args = 0x7fffb68e2c00
        i = <optimized out>
        cif = {abi = FFI_UNIX64, nargs = 4, arg_types = 0x7fffb68e2c30, rtype = 0x7f5da59f9000 <ffi_type_void>, bytes = 0, flags = 0}
        cc = 0x25b5350
        enum_tmpval = 0x7fffb68e2c80
        tmpval_used = 0
#11 0x00007f5db0717750 in g_closure_invoke (closure=0x25b5350, return_value=0x0, n_param_values=3, param_values=0x7fffb68e2f50, invocation_hint=0x7fffb68e2ef0) at /build/buildd/glib2.0-2.35.8/./gobject/gclosure.c:777
        marshal = 0x40e4a0 <g_cclosure_marshal_generic@plt>
        marshal_data = 0x0
        in_marshal = 0
        real_closure = 0x25b5330
        __PRETTY_FUNCTION__ = "g_closure_invoke"
#12 0x00007f5db07299c0 in signal_emit_unlocked_R (node=node@entry=0x22c3bb0, detail=detail@entry=0, instance=instance@entry=0xf24e10, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7fffb68e2f50) at /build/buildd/glib2.0-2.35.8/./gobject/gsignal.c:3566
        tmp = <optimized out>
        handler = 0x23be920
        accumulator = 0x0
        emission = {next = 0x7fffb68e3750, instance = 0xf24e10, ihint = {signal_id = 279, detail = 0, run_type = G_SIGNAL_RUN_FIRST}, state = EMISSION_RUN, chain_type = 4}
        class_closure = 0x0
        hlist = 0x23be920
        handler_list = 0x23be920
        return_accu = 0x0
        accu = {g_type = 0, data = {{v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
        signal_id = 279
        max_sequential_handler_number = 2308
        return_value_altered = 0
#13 0x00007f5db0731cfb in g_signal_emit_valist (instance=0xf24e10, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7fffb68e31c8) at /build/buildd/glib2.0-2.35.8/./gobject/gsignal.c:3314
        instance_and_params = 0x7fffb68e2f50
        signal_return_type = 4
        param_values = 0x7fffb68e2f68
        node = 0x22c3bb0
        i = <optimized out>
        n_params = 2
        __PRETTY_FUNCTION__ = "g_signal_emit_valist"
#14 0x00007f5db0731f22 in g_signal_emit (instance=<optimized out>, signal_id=<optimized out>, detail=detail@entry=0) at /build/buildd/glib2.0-2.35.8/./gobject/gsignal.c:3370
        var_args = {{gp_offset = 40, fp_offset = 48, overflow_arg_area = 0x7fffb68e32a0, reg_save_area = 0x7fffb68e31e0}}
#15 0x00000000004105c9 in on_call_state_changed_cb (call=<optimized out>, state=TP_CALL_STATE_ACCEPTED, flags=<optimized out>, reason=<optimized out>, details=<optimized out>, handler=<optimized out>) at empathy-call-handler.c:194
        priv = 0xf24e30
#16 0x00007f5da59f8c18 in ffi_call_unix64 () at ../src/x86/unix64.S:76
No locals.
#17 0x00007f5da59f8580 in ffi_call (cif=cif@entry=0x7fffb68e3560, fn=fn@entry=0x4105a0 <on_call_state_changed_cb>, rvalue=0x7fffb68e3490, avalue=avalue@entry=0x7fffb68e3410) at ../src/x86/ffi64.c:522
        classes = {X86_64_INTEGER_CLASS, X86_64_NO_CLASS, 15939744, X86_64_NO_CLASS}
        stack = 0x7fffb68e3230 "\260\343\360"
        argp = 0x7fffb68e32e0 ""
        arg_types = 0x7fffb68e3450
        gprcount = 6
        ssecount = <optimized out>
        ngpr = 1
        nsse = 0
        i = <optimized out>
        avn = <optimized out>
        ret_in_memory = <optimized out>
        reg_args = 0x7fffb68e3230
#18 0x00007f5db071873b in g_cclosure_marshal_generic_va (closure=0x22be110, return_value=0x0, instance=0xf0e3b0, args_list=<optimized out>, marshal_data=0x4105a0 <on_call_state_changed_cb>, n_params=4, param_types=0x229a700) at /build/buildd/glib2.0-2.35.8/./gobject/gclosure.c:1550
        rtype = 0x7f5da59f9000 <ffi_type_void>
        rvalue = 0x7fffb68e3490
        n_args = 6
        atypes = 0x7fffb68e3450
        args = 0x7fffb68e3410
        storage = 0x7fffb68e33e0
        i = <optimized out>
        cif = {abi = FFI_UNIX64, nargs = 6, arg_types = 0x7fffb68e3450, rtype = 0x7f5da59f9000 <ffi_type_void>, bytes = 0, flags = 0}
        cc = 0x22be110
        enum_tmpval = 0x7fffb68e34b0
        tmpval_used = 0
        args_copy = {{gp_offset = 48, fp_offset = 48, overflow_arg_area = 0x7fffb68e3978, reg_save_area = 0x7fffb68e38b0}}
#19 0x00007f5db0717a17 in _g_closure_invoke_va (closure=0x22be110, return_value=0x0, instance=0xf0e3b0, args=0x7fffb68e3898, n_params=4, param_types=0x229a700) at /build/buildd/glib2.0-2.35.8/./gobject/gclosure.c:840
        marshal = 0x7f5db0718230 <g_cclosure_marshal_generic_va>
        marshal_data = 0x0
        in_marshal = 0
        real_closure = 0x22be0f0
        __PRETTY_FUNCTION__ = "_g_closure_invoke_va"
#20 0x00007f5db07317f0 in g_signal_emit_valist (instance=0xf0e3b0, signal_id=<optimized out>, detail=0, var_args=var_args@entry=0x7fffb68e3898) at /build/buildd/glib2.0-2.35.8/./gobject/gsignal.c:3225
        return_accu = <optimized out>
        accu = {g_type = 0, data = {{v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
        accumulator = 0x0
        emission = {next = 0x0, instance = 0xf0e3b0, ihint = {signal_id = 258, detail = 0, run_type = G_SIGNAL_RUN_FIRST}, state = EMISSION_RUN, chain_type = 36140304}
        signal_id = <optimized out>
        instance_type = <optimized out>
        emission_return = {g_type = 0, data = {{v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
        rtype = 4
        static_scope = 0
        closure = 0x22be110
        run_type = <optimized out>
        hlist = 0x0
        l = <optimized out>
        fastpath = 4
        instance_and_params = <optimized out>
        signal_return_type = <optimized out>
        param_values = <optimized out>
        node = 0x22a50c0
        i = <optimized out>
        n_params = <optimized out>
        __PRETTY_FUNCTION__ = "g_signal_emit_valist"
#21 0x00007f5db0731f22 in g_signal_emit (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>) at /build/buildd/glib2.0-2.35.8/./gobject/gsignal.c:3370
        var_args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 0x7fffb68e3970, reg_save_area = 0x7fffb68e38b0}}
#22 0x00007f5db2124db5 in _tp_cli_channel_type_call_invoke_callback_for_call_state_changed (tpproxy=0xf0e3b0, error=<optimized out>, args=0x26b2240, generic_callback=0x7f5db210c890 <call_state_changed_cb>, user_data=<optimized out>, weak_object=<optimized out>) at _gen/tp-cli-channel-body.h:10181
        callback = 0x7f5db210c890 <call_state_changed_cb>
#23 0x00007f5db21e275c in tp_proxy_signal_invocation_run (p=0x2697e60) at proxy-signals.c:268
        invocation = 0x2697e60
        popped = <optimized out>
#24 0x00007f5db0453e85 in g_main_dispatch (context=0xef0e00) at /build/buildd/glib2.0-2.35.8/./glib/gmain.c:3054
        dispatch = 0x7f5db0450c20 <g_idle_dispatch>
        was_in_call = 0
        user_data = 0x2697e60
        callback = 0x7f5db21e2700 <tp_proxy_signal_invocation_run>
        cb_funcs = 0x7f5db0705a00 <g_source_callback_funcs>
        cb_data = 0x396d8a0
        current_source_link = {data = 0x3926880, next = 0x0}
        need_destroy = <optimized out>
        source = 0x3926880
        current = 0xf39640
        i = <optimized out>
#25 g_main_context_dispatch (context=context@entry=0xef0e00) at /build/buildd/glib2.0-2.35.8/./glib/gmain.c:3630
No locals.
#26 0x00007f5db04541c8 in g_main_context_iterate (context=context@entry=0xef0e00, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.35.8/./glib/gmain.c:3701
        max_priority = -100
        timeout = 0
        some_ready = 1
        allocated_nfds = <optimized out>
        fds = 0x2469e50
        nfds = <optimized out>
#27 0x00007f5db0454284 in g_main_context_iteration (context=0xef0e00, context@entry=0x0, may_block=may_block@entry=1) at /build/buildd/glib2.0-2.35.8/./glib/gmain.c:3762
        retval = <optimized out>
#28 0x00007f5db09fc51c in g_application_run (application=0x226b490, argc=argc@entry=1, argv=argv@entry=0x7fffb68e3c98) at /build/buildd/glib2.0-2.35.8/./gio/gapplication.c:1620
        arguments = 0x2280f80
        status = 0
        i = <optimized out>
        __PRETTY_FUNCTION__ = "g_application_run"
#29 0x000000000040f4be in main (argc=1, argv=0x7fffb68e3c98) at empathy-call.c:251
        optcontext = <optimized out>
        options = {{long_name = 0x0, short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_NONE, arg_data = 0x0, description = 0x0, arg_description = 0x0}}
        debug_sender = 0x2277b60
        error = 0x0
        retval = <optimized out>
        gtk_settings = <optimized out>
        __PRETTY_FUNCTION__ = "main"