I think I now have data to confirm that indeed it is the shell's
interaction with tracker, which is at fault.


For search, you can define what all sources you want to search for, in
GNOME shell. At this moment, the following were the problem

GNOME Software
GNOME Bijiben Notes
GNOME Contacts
GNOME Calendar


Nov 28 12:36:51 learner org.gnome.Bijiben.SearchProvider[9965]: 
(bijiben-shell-search-provider:2934): GLib-GObject-CRITICAL **: g_object_unref: 
assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:07 learner org.gnome.Bijiben.SearchProvider[9965]: 
(bijiben-shell-search-provider:2934): GLib-GObject-CRITICAL **: g_object_unref: 
assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:07 learner org.gnome.Bijiben.SearchProvider[9965]: sending the 
mass change
Nov 28 12:37:07 learner org.gnome.Bijiben.SearchProvider[9965]: 
(bijiben-shell-search-provider:2934): GLib-GObject-WARNING **: invalid (NULL) 
pointer instance
Nov 28 12:37:07 learner org.gnome.Bijiben.SearchProvider[9965]: 
(bijiben-shell-search-provider:2934): GLib-GObject-CRITICAL **: 
g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
Nov 28 12:37:07 learner org.gnome.Bijiben.SearchProvider[9965]: ** Message: 
Updating ressource <telephone> urn:uuid:e46e072a-56f2-d059-d197-60c6158cc1cd
Nov 28 12:37:07 learner org.gnome.Bijiben.SearchProvider[9965]: sending the 
mass change
Nov 28 12:37:11 learner dbus-daemon[9965]: Activating service 
name='org.gnome.Nautilus'
Nov 28 12:37:11 learner dbus-daemon[9965]: Activating service 
name='org.gnome.Documents'
Nov 28 12:37:11 learner dbus-daemon[9965]: Activating service 
name='org.gnome.Photos'
Nov 28 12:37:11 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:11 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:11 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:11 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:11 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:11 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:11 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:11 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:11 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:11 learner dbus-daemon[9965]: Activating service 
name='org.gnome.Calculator.SearchProvider'
Nov 28 12:37:11 learner dbus-daemon[9965]: Activating service 
name='org.gnome.Boxes.SearchProvider'
Nov 28 12:37:11 learner dbus-daemon[9965]: Activating service 
name='org.gnome.Contacts.SearchProvider'
Nov 28 12:37:11 learner dbus-daemon[9965]: Activating service 
name='org.gnome.clocks'
Nov 28 12:37:11 learner dbus-daemon[9965]: Activating service 
name='org.gnome.Characters.BackgroundService'
Nov 28 12:37:11 learner dbus-daemon[9965]: Activating service 
name='org.gnome.Software'
Nov 28 12:37:11 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.Calculator.SearchProvider'
Nov 28 12:37:11 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.Nautilus'
Nov 28 12:37:11 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.Boxes.SearchProvider'
Nov 28 12:37:11 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.clocks'
Nov 28 12:37:11 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.Photos'
Nov 28 12:37:11 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.Software'
Nov 28 12:37:12 learner org.gnome.Nautilus[9965]: nautilus-wipe-Message: 
Initializing
Nov 28 12:37:12 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.Characters.BackgroundService'
Nov 28 12:37:12 learner org.gnome.Nautilus[9965]: sys:1: PyGIWarning: Nautilus 
was imported without specifying a version first. Use 
gi.require_version('Nautilus', '3.0') before import to ensure that the right 
version gets loaded.
Nov 28 12:37:12 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.Contacts.SearchProvider'
Nov 28 12:37:12 learner org.gnome.Nautilus[9965]: 
/usr/share/nautilus-python/extensions/nautilus-admin.py:18: PyGIWarning: GConf 
was imported without specifying a version first. Use 
gi.require_version('GConf', '2.0') before import to ensure that the right 
version gets loaded.
Nov 28 12:37:12 learner org.gnome.Nautilus[9965]: from gi.repository import 
Nautilus, GObject, GConf, Gtk, GLib
Nov 28 12:37:12 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.Documents'
Nov 28 12:37:12 learner org.gnome.Software[9965]: (org.gnome.Software:3375): 
PackageKit-WARNING **: failed to set proxy: 
GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._pk_5fengine_5ferror.Code3: 
setting the proxy failed
Nov 28 12:37:12 learner org.gnome.Software[9965]: (org.gnome.Software:3375): 
Gs-WARNING **: failed to set proxies: 
GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._pk_5fengine_5ferror.Code3: 
setting the proxy failed
Nov 28 12:37:12 learner nautilus[3334]: [N-A] Nautilus-Actions Menu Extender 
3.2.3 initializing...
Nov 28 12:37:12 learner org.gnome.Nautilus[9965]: Socket: 
/run/user/1000/ownCloud/socket <=> /ownCloud/socket
Nov 28 12:37:12 learner org.gnome.Nautilus[9965]: Socket File: 
/run/user/1000/ownCloud/socket
Nov 28 12:37:12 learner org.gnome.Nautilus[9965]: Could not connect to unix 
socket.[Errno 2] No such file or directory
Nov 28 12:37:12 learner org.gnome.Nautilus[9965]: Initializing 
nautilus-image-converter extension
Nov 28 12:37:12 learner nautilus[3334]: [N-A] Nautilus-Actions Tracker 3.2.3 
initializing...
Nov 28 12:37:13 learner dbus-daemon[9965]: Activating service 
name='org.gnome.OnlineMiners.MediaServer'
Nov 28 12:37:13 learner org.gnome.OnlineMiners.MediaServer[9965]: Gom-Message: 
Setting scheduler policy to SCHED_IDLE
Nov 28 12:37:15 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.OnlineMiners.MediaServer'
Nov 28 12:37:15 learner dbus-daemon[9965]: Activating service 
name='org.gnome.OnlineMiners.GData'
Nov 28 12:37:15 learner org.gnome.OnlineMiners.GData[9965]: Gom-Message: 
Setting scheduler policy to SCHED_IDLE
Nov 28 12:37:15 learner org.gnome.OnlineMiners.MediaServer[9965]: 
(gom-media-server-miner:3517): Gom-WARNING **: Unable to Call GetServers : 
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name 
com.intel.dleyna-server was not provided by any .service files
Nov 28 12:37:15 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.OnlineMiners.GData'
Nov 28 12:37:15 learner dbus-daemon[9965]: Activating service 
name='org.gnome.OnlineMiners.Flickr'
Nov 28 12:37:15 learner org.gnome.OnlineMiners.Flickr[9965]: Gom-Message: 
Setting scheduler policy to SCHED_IDLE
Nov 28 12:37:15 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_insert_before: assertion 'iter_is_valid (sibling, list_store)' 
failed
Nov 28 12:37:15 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_set_valist: assertion 'iter_is_valid (iter, list_store)' failed
Nov 28 12:37:15 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.OnlineMiners.Flickr'
Nov 28 12:37:15 learner dbus-daemon[9965]: Activating service 
name='org.gnome.OnlineMiners.Facebook'
Nov 28 12:37:15 learner org.gnome.OnlineMiners.Facebook[9965]: Gom-Message: 
Setting scheduler policy to SCHED_IDLE
Nov 28 12:37:15 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.OnlineMiners.Facebook'
Nov 28 12:37:15 learner org.gnome.Photos[9965]: ** (gnome-photos:3356): WARNING 
**: Unable to fetch the list of available renderers: 
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name 
com.intel.dleyna-renderer was not provided by any .service files
Nov 28 12:37:15 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_insert_before: assertion 'iter_is_valid (sibling, list_store)' 
failed
Nov 28 12:37:15 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_set_valist: assertion 'iter_is_valid (iter, list_store)' failed
Nov 28 12:37:15 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_insert_before: assertion 'iter_is_valid (sibling, list_store)' 
failed
Nov 28 12:37:15 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_set_valist: assertion 'iter_is_valid (iter, list_store)' failed
Nov 28 12:37:15 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_insert_before: assertion 'iter_is_valid (sibling, list_store)' 
failed
Nov 28 12:37:15 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_set_valist: assertion 'iter_is_valid (iter, list_store)' failed
Nov 28 12:37:15 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_insert_before: assertion 'iter_is_valid (sibling, list_store)' 
failed
Nov 28 12:37:15 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_set_valist: assertion 'iter_is_valid (iter, list_store)' failed
Nov 28 12:37:15 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_insert_before: assertion 'iter_is_valid (sibling, list_store)' 
failed
Nov 28 12:37:15 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_set_valist: assertion 'iter_is_valid (iter, list_store)' failed
Nov 28 12:37:18 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_insert_before: assertion 'iter_is_valid (sibling, list_store)' 
failed
Nov 28 12:37:18 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_set_valist: assertion 'iter_is_valid (iter, list_store)' failed
Nov 28 12:37:18 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_insert_before: assertion 'iter_is_valid (sibling, list_store)' 
failed
Nov 28 12:37:18 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_set_valist: assertion 'iter_is_valid (iter, list_store)' failed
Nov 28 12:37:18 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_insert_before: assertion 'iter_is_valid (sibling, list_store)' 
failed
Nov 28 12:37:18 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_set_valist: assertion 'iter_is_valid (iter, list_store)' failed
Nov 28 12:37:18 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_insert_before: assertion 'iter_is_valid (sibling, list_store)' 
failed
Nov 28 12:37:18 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_set_valist: assertion 'iter_is_valid (iter, list_store)' failed
Nov 28 12:37:18 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_insert_before: assertion 'iter_is_valid (sibling, list_store)' 
failed
Nov 28 12:37:18 learner org.gnome.Contacts.SearchProvider[9965]: 
(gnome-contacts-search-provider:3368): Gtk-CRITICAL **: 
gtk_list_store_set_valist: assertion 'iter_is_valid (iter, list_store)' failed
Nov 28 12:37:21 learner gnome-session[9936]: (gnome-shell:10215): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
Nov 28 12:37:21 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:21 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:21 learner gnome-session[9936]: (gnome-shell:10215): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
Nov 28 12:37:21 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:21 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:21 learner gnome-session[9936]: (gnome-shell:10215): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
Nov 28 12:37:21 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:21 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:21 learner gnome-session[9936]: (gnome-shell:10215): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
Nov 28 12:37:21 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:21 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:21 learner gnome-session[9936]: (gnome-shell:10215): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
Nov 28 12:37:21 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:21 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:21 learner gnome-session[9936]: (gnome-shell:10215): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
Nov 28 12:37:21 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:21 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:23 learner org.gnome.Photos[9965]: (gnome-photos:3356): 
GLib-GIO-CRITICAL **: g_file_new_for_path: assertion 'path != NULL' failed
Nov 28 12:37:23 learner org.gnome.Photos[9965]: (gnome-photos:3356): 
GLib-GIO-CRITICAL **: g_file_icon_new: assertion 'G_IS_FILE (file)' failed
Nov 28 12:37:23 learner org.gnome.Photos[9965]: (gnome-photos:3356): 
GLib-GIO-CRITICAL **: g_file_new_for_path: assertion 'path != NULL' failed
Nov 28 12:37:23 learner org.gnome.Photos[9965]: (gnome-photos:3356): 
GLib-GIO-CRITICAL **: g_file_icon_new: assertion 'G_IS_FILE (file)' failed
Nov 28 12:37:23 learner org.gnome.Photos[9965]: (gnome-photos:3356): 
GLib-GIO-CRITICAL **: g_file_new_for_path: assertion 'path != NULL' failed
Nov 28 12:37:23 learner org.gnome.Photos[9965]: (gnome-photos:3356): 
GLib-GIO-CRITICAL **: g_file_icon_new: assertion 'G_IS_FILE (file)' failed
Nov 28 12:37:23 learner gnome-session[9936]: (gnome-shell:10215): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
Nov 28 12:37:23 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:23 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:23 learner gnome-session[9936]: (gnome-shell:10215): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
Nov 28 12:37:23 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:23 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:23 learner gnome-session[9936]: (gnome-shell:10215): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
Nov 28 12:37:23 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:23 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:23 learner gnome-session[9936]: (gnome-shell:10215): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
Nov 28 12:37:23 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:23 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:23 learner gnome-session[9936]: (gnome-shell:10215): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
Nov 28 12:37:23 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:23 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:23 learner gnome-session[9936]: (gnome-shell:10215): 
Clutter-CRITICAL **: clutter_layout_manager_get_child_meta: assertion 
'CLUTTER_IS_LAYOUT_MANAGER (manager)' failed
Nov 28 12:37:23 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:23 learner gnome-session[9936]: (gnome-shell:10215): 
GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:26 learner org.gnome.Nautilus[9965]: Socket: 
/run/user/1000/ownCloud/socket <=> /ownCloud/socket
Nov 28 12:37:26 learner org.gnome.Nautilus[9965]: Socket File: 
/run/user/1000/ownCloud/socket
Nov 28 12:37:26 learner org.gnome.Nautilus[9965]: Could not connect to unix 
socket.[Errno 2] No such file or directory
Nov 28 12:37:26 learner org.gnome.Nautilus[9965]: Socket: 
/run/user/1000/ownCloud/socket <=> /ownCloud/socket
Nov 28 12:37:26 learner org.gnome.Nautilus[9965]: Socket File: 
/run/user/1000/ownCloud/socket
Nov 28 12:37:26 learner org.gnome.Nautilus[9965]: Could not connect to unix 
socket.[Errno 2] No such file or directory
Nov 28 12:37:30 learner org.gnome.Bijiben.SearchProvider[9965]: 
(bijiben-shell-search-provider:2934): GLib-GObject-CRITICAL **: g_object_unref: 
assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:38 learner dbus-daemon[9965]: Activating service 
name='org.gnome.ControlCenter.SearchProvider'
Nov 28 12:37:38 learner dbus-daemon[9965]: Activating service 
name='org.gnome.Nautilus'
Nov 28 12:37:38 learner dbus-daemon[9965]: Activating service 
name='org.gnome.Documents'
Nov 28 12:37:38 learner dbus-daemon[9965]: Activating service 
name='org.gnome.Photos'
Nov 28 12:37:38 learner dbus-daemon[9965]: Activating service 
name='org.gnome.Calculator.SearchProvider'
Nov 28 12:37:38 learner dbus-daemon[9965]: Activating service 
name='org.gnome.Boxes.SearchProvider'
Nov 28 12:37:38 learner dbus-daemon[9965]: Activating service 
name='org.gnome.clocks'
Nov 28 12:37:38 learner dbus-daemon[9965]: Activating service 
name='org.gnome.Software'
Nov 28 12:37:38 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.Calculator.SearchProvider'
Nov 28 12:37:38 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.Boxes.SearchProvider'
Nov 28 12:37:38 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.Nautilus'
Nov 28 12:37:38 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.clocks'
Nov 28 12:37:38 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.ControlCenter.SearchProvider'
Nov 28 12:37:39 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:39 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:39 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:39 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:39 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:39 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:39 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:39 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:39 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:39 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.Software'
Nov 28 12:37:39 learner org.gnome.Nautilus[9965]: nautilus-wipe-Message: 
Initializing
Nov 28 12:37:39 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.Photos'
Nov 28 12:37:39 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:39 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:39 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:39 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:39 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:39 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:39 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:39 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:39 learner org.gnome.Calendar[9965]: ** (gnome-calendar:2932): 
WARNING **: Job failed: Operation was cancelled
Nov 28 12:37:39 learner org.gnome.Nautilus[9965]: sys:1: PyGIWarning: Nautilus 
was imported without specifying a version first. Use 
gi.require_version('Nautilus', '3.0') before import to ensure that the right 
version gets loaded.
Nov 28 12:37:39 learner org.gnome.Software[9965]: (org.gnome.Software:3571): 
PackageKit-WARNING **: failed to set proxy: 
GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._pk_5fengine_5ferror.Code3: 
setting the proxy failed
Nov 28 12:37:39 learner org.gnome.Software[9965]: (org.gnome.Software:3571): 
Gs-WARNING **: failed to set proxies: 
GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._pk_5fengine_5ferror.Code3: 
setting the proxy failed
Nov 28 12:37:39 learner org.gnome.Nautilus[9965]: 
/usr/share/nautilus-python/extensions/nautilus-admin.py:18: PyGIWarning: GConf 
was imported without specifying a version first. Use 
gi.require_version('GConf', '2.0') before import to ensure that the right 
version gets loaded.
Nov 28 12:37:39 learner org.gnome.Nautilus[9965]: from gi.repository import 
Nautilus, GObject, GConf, Gtk, GLib
Nov 28 12:37:39 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.Documents'
Nov 28 12:37:39 learner nautilus[3558]: [N-A] Nautilus-Actions Menu Extender 
3.2.3 initializing...
Nov 28 12:37:39 learner org.gnome.Nautilus[9965]: Socket: 
/run/user/1000/ownCloud/socket <=> /ownCloud/socket
Nov 28 12:37:39 learner org.gnome.Nautilus[9965]: Socket File: 
/run/user/1000/ownCloud/socket
Nov 28 12:37:39 learner org.gnome.Nautilus[9965]: Could not connect to unix 
socket.[Errno 2] No such file or directory
Nov 28 12:37:39 learner org.gnome.Nautilus[9965]: Initializing 
nautilus-image-converter extension
Nov 28 12:37:39 learner nautilus[3558]: [N-A] Nautilus-Actions Tracker 3.2.3 
initializing...
Nov 28 12:37:40 learner dbus-daemon[9965]: Activating service 
name='org.gnome.OnlineMiners.MediaServer'
Nov 28 12:37:40 learner org.gnome.OnlineMiners.MediaServer[9965]: Gom-Message: 
Setting scheduler policy to SCHED_IDLE
Nov 28 12:37:40 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.OnlineMiners.MediaServer'
Nov 28 12:37:40 learner dbus-daemon[9965]: Activating service 
name='org.gnome.OnlineMiners.GData'
Nov 28 12:37:40 learner org.gnome.OnlineMiners.GData[9965]: Gom-Message: 
Setting scheduler policy to SCHED_IDLE
Nov 28 12:37:40 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.OnlineMiners.GData'
Nov 28 12:37:40 learner dbus-daemon[9965]: Activating service 
name='org.gnome.OnlineMiners.Flickr'
Nov 28 12:37:40 learner org.gnome.OnlineMiners.Flickr[9965]: Gom-Message: 
Setting scheduler policy to SCHED_IDLE
Nov 28 12:37:40 learner org.gnome.OnlineMiners.MediaServer[9965]: 
(gom-media-server-miner:3669): Gom-WARNING **: Unable to Call GetServers : 
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name 
com.intel.dleyna-server was not provided by any .service files
Nov 28 12:37:40 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.OnlineMiners.Flickr'
Nov 28 12:37:40 learner dbus-daemon[9965]: Activating service 
name='org.gnome.OnlineMiners.Facebook'
Nov 28 12:37:40 learner org.gnome.OnlineMiners.Facebook[9965]: Gom-Message: 
Setting scheduler policy to SCHED_IDLE
Nov 28 12:37:40 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.OnlineMiners.Facebook'
Nov 28 12:37:40 learner org.gnome.Photos[9965]: ** (gnome-photos:3568): WARNING 
**: Unable to fetch the list of available renderers: 
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name 
com.intel.dleyna-renderer was not provided by any .service files
Nov 28 12:37:46 learner systemd[1]: Starting Laptop Mode Tools - Battery 
Polling Service...
Nov 28 12:37:46 learner systemd[1]: Reloading Laptop Mode Tools.
Nov 28 12:37:46 learner systemd[1]: Started Laptop Mode Tools - Battery Polling 
Service.
Nov 28 12:37:46 learner laptop-mode[3746]: Laptop mode
Nov 28 12:37:46 learner laptop_mode[3694]: Laptop mode
Nov 28 12:37:46 learner laptop-mode[3747]: enabled, active [unchanged]
Nov 28 12:37:46 learner laptop_mode[3694]: enabled, active [unchanged]
Nov 28 12:37:46 learner systemd[1]: Reloaded Laptop Mode Tools.
Nov 28 12:37:48 learner org.gnome.Bijiben.SearchProvider[9965]: 
(bijiben-shell-search-provider:2934): GLib-GObject-CRITICAL **: g_object_unref: 
assertion 'G_IS_OBJECT (object)' failed
Nov 28 12:37:52 learner org.gnome.Nautilus[9965]: Socket: 
/run/user/1000/ownCloud/socket <=> /ownCloud/socket
Nov 28 12:37:52 learner org.gnome.Nautilus[9965]: Socket File: 
/run/user/1000/ownCloud/socket
Nov 28 12:37:52 learner org.gnome.Nautilus[9965]: Could not connect to unix 
socket.[Errno 2] No such file or directory
Nov 28 12:37:52 learner org.gnome.Nautilus[9965]: Socket: 
/run/user/1000/ownCloud/socket <=> /ownCloud/socket
Nov 28 12:37:52 learner org.gnome.Nautilus[9965]: Socket File: 
/run/user/1000/ownCloud/socket
Nov 28 12:37:52 learner org.gnome.Nautilus[9965]: Could not connect to unix 
socket.[Errno 2] No such file or directory
Nov 28 12:38:02 learner org.gnome.Bijiben.SearchProvider[9965]: 
(bijiben-shell-search-provider:2934): GLib-GObject-CRITICAL **: g_object_unref: 
assertion 'G_IS_OBJECT (object)' failed





Deactivating them led to a cleaner GNOME Journal log, below. And the
results are now relevant to what I expect.


Nov 28 12:39:24 learner dbus-daemon[9965]: Activating service 
name='org.gnome.ControlCenter.SearchProvider'
Nov 28 12:39:24 learner dbus-daemon[9965]: Activating service 
name='org.gnome.Nautilus'
Nov 28 12:39:24 learner dbus-daemon[9965]: Activating service 
name='org.gnome.Documents'
Nov 28 12:39:24 learner dbus-daemon[9965]: Activating service 
name='org.gnome.Photos'
Nov 28 12:39:24 learner dbus-daemon[9965]: Activating service 
name='org.gnome.Calculator.SearchProvider'
Nov 28 12:39:24 learner dbus-daemon[9965]: Activating service 
name='org.gnome.Boxes.SearchProvider'
Nov 28 12:39:24 learner dbus-daemon[9965]: Activating service 
name='org.gnome.clocks'
Nov 28 12:39:24 learner dbus-daemon[9965]: Activating service 
name='org.gnome.Characters.BackgroundService'
Nov 28 12:39:24 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.Calculator.SearchProvider'
Nov 28 12:39:24 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.Nautilus'
Nov 28 12:39:24 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.Boxes.SearchProvider'
Nov 28 12:39:24 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.ControlCenter.SearchProvider'
Nov 28 12:39:24 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.clocks'
Nov 28 12:39:24 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.Characters.BackgroundService'
Nov 28 12:39:24 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.Photos'
Nov 28 12:39:25 learner org.gnome.Nautilus[9965]: nautilus-wipe-Message: 
Initializing
Nov 28 12:39:25 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.Documents'
Nov 28 12:39:25 learner org.gnome.Nautilus[9965]: sys:1: PyGIWarning: Nautilus 
was imported without specifying a version first. Use 
gi.require_version('Nautilus', '3.0') before import to ensure that the right 
version gets loaded.
Nov 28 12:39:25 learner org.gnome.Nautilus[9965]: 
/usr/share/nautilus-python/extensions/nautilus-admin.py:18: PyGIWarning: GConf 
was imported without specifying a version first. Use 
gi.require_version('GConf', '2.0') before import to ensure that the right 
version gets loaded.
Nov 28 12:39:25 learner org.gnome.Nautilus[9965]: from gi.repository import 
Nautilus, GObject, GConf, Gtk, GLib
Nov 28 12:39:25 learner nautilus[3872]: [N-A] Nautilus-Actions Menu Extender 
3.2.3 initializing...
Nov 28 12:39:25 learner org.gnome.Nautilus[9965]: Socket: 
/run/user/1000/ownCloud/socket <=> /ownCloud/socket
Nov 28 12:39:25 learner org.gnome.Nautilus[9965]: Socket File: 
/run/user/1000/ownCloud/socket
Nov 28 12:39:25 learner org.gnome.Nautilus[9965]: Could not connect to unix 
socket.[Errno 2] No such file or directory
Nov 28 12:39:25 learner org.gnome.Nautilus[9965]: Initializing 
nautilus-image-converter extension
Nov 28 12:39:25 learner nautilus[3872]: [N-A] Nautilus-Actions Tracker 3.2.3 
initializing...
Nov 28 12:39:25 learner dbus-daemon[9965]: Activating service 
name='org.gnome.OnlineMiners.MediaServer'
Nov 28 12:39:25 learner org.gnome.OnlineMiners.MediaServer[9965]: Gom-Message: 
Setting scheduler policy to SCHED_IDLE
Nov 28 12:39:25 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.OnlineMiners.MediaServer'
Nov 28 12:39:25 learner dbus-daemon[9965]: Activating service 
name='org.gnome.OnlineMiners.GData'
Nov 28 12:39:25 learner org.gnome.OnlineMiners.MediaServer[9965]: 
(gom-media-server-miner:3930): Gom-WARNING **: Unable to Call GetServers : 
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name 
com.intel.dleyna-server was not provided by any .service files
Nov 28 12:39:25 learner org.gnome.OnlineMiners.GData[9965]: Gom-Message: 
Setting scheduler policy to SCHED_IDLE
Nov 28 12:39:25 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.OnlineMiners.GData'
Nov 28 12:39:25 learner dbus-daemon[9965]: Activating service 
name='org.gnome.OnlineMiners.Flickr'
Nov 28 12:39:25 learner org.gnome.OnlineMiners.Flickr[9965]: Gom-Message: 
Setting scheduler policy to SCHED_IDLE
Nov 28 12:39:25 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.OnlineMiners.Flickr'
Nov 28 12:39:25 learner dbus-daemon[9965]: Activating service 
name='org.gnome.OnlineMiners.Facebook'
Nov 28 12:39:25 learner org.gnome.OnlineMiners.Facebook[9965]: Gom-Message: 
Setting scheduler policy to SCHED_IDLE
Nov 28 12:39:25 learner dbus-daemon[9965]: Successfully activated service 
'org.gnome.OnlineMiners.Facebook'
Nov 28 12:39:25 learner org.gnome.Photos[9965]: ** (gnome-photos:3879): WARNING 
**: Unable to fetch the list of available renderers: 
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name 
com.intel.dleyna-renderer was not provided by any .service files
Nov 28 12:39:30 learner org.gnome.Photos[9965]: (gnome-photos:3879): 
GLib-GIO-CRITICAL **: g_file_new_for_path: assertion 'path != NULL' failed
Nov 28 12:39:30 learner org.gnome.Photos[9965]: (gnome-photos:3879): 
GLib-GIO-CRITICAL **: g_file_icon_new: assertion 'G_IS_FILE (file)' failed
Nov 28 12:39:37 learner org.gnome.Nautilus[9965]: Socket: 
/run/user/1000/ownCloud/socket <=> /ownCloud/socket
Nov 28 12:39:37 learner org.gnome.Nautilus[9965]: Socket File: 
/run/user/1000/ownCloud/socket
Nov 28 12:39:37 learner org.gnome.Nautilus[9965]: Could not connect to unix 
socket.[Errno 2] No such file or directory
Nov 28 12:39:37 learner org.gnome.Nautilus[9965]: Socket: 
/run/user/1000/ownCloud/socket <=> /ownCloud/socket
Nov 28 12:39:37 learner org.gnome.Nautilus[9965]: Socket File: 
/run/user/1000/ownCloud/socket
Nov 28 12:39:37 learner org.gnome.Nautilus[9965]: Could not connect to unix 
socket.[Errno 2] No such file or directory


So, it has nothing much to do with tracker, but rather GNOME's Ill interaction.

 
On Sat, 2015-11-28 at 12:13 +0530, Ritesh Raj Sarraf wrote:
> I think other should be able to reproduce, if:
> 
> 1) Enable online accounts for Google, FB, Flickr etc
> 2) Let it do some sync.
> 3) Let Tracker index your data. This will also include your
> {meta}data
> from online account
> 4) Try some searches. Both on the shell and `tracker search`
> 
> 
> A properly written tool should not be blocking. In case of tracker,
> it
> is not so. I hope 1.7 has improvements.
-- 
Ritesh Raj Sarraf
RESEARCHUT - http://www.researchut.com
"Necessity is the mother of invention."

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