Comment 2 for bug 1297181

StacktraceTop:
 pa_ext_stream_restore_write (c=0x84f9d18, mode=mode@entry=PA_UPDATE_REPLACE, data=data@entry=0xbfbce86c, n=n@entry=1, apply_immediately=apply_immediately@entry=1, cb=cb@entry=0x0, userdata=userdata@entry=0x0) at pulse/ext-stream-restore.c:200
 update_settings (role=0x83b76e8, is_muted=0, op=0x0) at gvc-mixer-event-role.c:76
 gvc_mixer_stream_change_is_muted (stream=0x83b76e8, is_muted=is_muted@entry=0) at gvc-mixer-stream.c:791
 on_bar_is_muted_notify (object=0x84fb3f0, pspec=0x8a80a78, dialog=0x839a3f0) at gvc-mixer-dialog.c:536
 g_cclosure_marshal_VOID__PARAM (closure=0x8a9caf8, return_value=0x0, n_param_values=2, param_values=0xbfbceb50, invocation_hint=0xbfbceafc, marshal_data=0x0) at /build/buildd/glib2.0-2.39.92/./gobject/gmarshal.c:1042