empathy-chat crashed with SIGSEGV in _tp_base_client_handle_channels()

Open bug in launchpad.net:
https://bugs.launchpad.net/bugs/829861

"I'm working with empathy and crash."

#0 _tp_base_client_handle_channels (iface=<optimized out>, account_path=<optimized out>, connection_path=<optimized out>, channels_arr=0x25e0cc0, requests_arr=0x25e0d80, user_action_time=0, handler_info=0x25df5e0, context=0x25e33e0) at base-client.c:2336
        chan_path = 0x25af200 "/org/freedesktop/Telepathy/Connection/idle/irc/username_40chat_2efreenode_2enet0x100c1b0/MucChannel1"
        chan_props = 0x25df580
        self = 0x25d11b0
        ctx = <optimized out>
        cls = <optimized out>
        error = 0x0
        account = 0x25d87a0
        connection = 0x24d0170
        channels = 0x25e0a60
        requests = 0x0
        i = <optimized out>
        channel = 0x0
        account_features = <optimized out>
        connection_features = <optimized out>
        channel_features = <optimized out>
        __PRETTY_FUNCTION__ = "_tp_base_client_handle_channels"
#1 0x00007ffd0ec5b687 in _tp_marshal_VOID__BOXED_BOXED_BOXED_BOXED_UINT64_BOXED_POINTER (closure=0x7fff1a676bd0, return_value=<optimized out>, n_param_values=<optimized out>, param_values=0x25b4400, invocation_hint=<optimized out>, marshal_data=<optimized out>) at _gen/signals-marshal.c:452
        callback = 0x7ffd0ec695b0 <tp_svc_client_handler_handle_channels>
        cc = 0x7fff1a676bd0
        data1 = 0x25d11b0
        data2 = <optimized out>
        __PRETTY_FUNCTION__ = "_tp_marshal_VOID__BOXED_BOXED_BOXED_BOXED_UINT64_BOXED_POINTER"
#2 0x00007ffd0f11d9c2 in invoke_object_method (message=0x25a5f10, connection=0x24ebc40, method=0x7ffd0eee9ca0, object_info=0x7ffd0eee7e00, object=0x25d11b0) at dbus-gobject.c:1744
        had_error = <optimized out>
        value_array = 0x25e0ca0
        result = <optimized out>
        gerror = 0x0
        closure = {ref_count = 0, meta_marshal = 0, n_guards = 0, n_fnotifiers = 0, n_inotifiers = 0, in_inotify = 0, floating = 0, derivative_flag = 0, in_marshal = 0, is_invalid = 0, marshal = 0, data = 0x0, notifiers = 0x0}
        out_param_pos = <optimized out>
        have_retval = 0
        send_reply = <optimized out>
        in_signature = 0x25e07d0 "ooa(oa{sv})aota{sv}"
        out_param_count = <optimized out>
        out_param_gvalue_pos = <optimized out>
        retval_signals_error = 0
        arg_metadata = <optimized out>
        is_async = 1
        out_param_values = 0x0
        return_value = {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}}}
        out_param_gvalues = 0x0
        reply = 0x0
        retval_is_synthetic = 0
        retval_is_constant = 0
#3 object_registration_message (connection=0x24ebc40, message=0x25a5f10, user_data=<optimized out>) at dbus-gobject.c:1968
        pspec = <optimized out>
        object = 0x25d11b0
        setter = <optimized out>
        getter = <optimized out>
        getall = <optimized out>
        s = <optimized out>
        requested_propname = <optimized out>
        ...

Looking at base-client.c:2336:

2332 channel = ensure_channel (self, connection, chan_path, chan_props,
2333 &error);
2334 if (channel == NULL)
2335 {
2336 → DEBUG ("Failed to create TpChannel: %s", error->message);
2337 goto out;
2338 }

This plus:

SegvReason: reading NULL VMA

suggests to me that 'error' is NULL, which suggests to me that 'ensure_channel' (or rather, something within it) is hitting g_return_if_fail().

From the .xsession-errors file, a few instances of:

(empathy:26326): empathy-CRITICAL **: empathy_contact_get_account: assertion `EMPATHY_IS_CONTACT (contact)' failed

are the only criticals I see. From ProcStatus.txt:

Pid: 28326

Soooooooo this looks like Empathy is probably at fault here.

> Soooooooo this looks like Empathy is probably at fault here.

If this is still an issue nowadays, please report to Empathy.