gnome-photos crashes on startup from the command line including in a new user, in JWM/startx. It's Mageia v6/cauldron x86-64. Other gnome applications start fine. Here is the gdb backtrace:

Script started on Thu 16 Feb 2017 13:25:30 IST
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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Reading symbols from /usr/bin/gnome-photos...Reading symbols from /usr/lib/debug/usr/bin/gnome-photos.debug...done.
done.
(gdb) r
Starting program: /usr/bin/gnome-photos 
Missing separate debuginfos, use: debuginfo-install glibc-2.22-21.mga6.x86_64
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
warning: the debug information found in "/usr/lib/debug//usr/lib64/libxml2.so.2.9.4.debug" does not match "/lib64/libxml2.so.2" (CRC mismatch).

Missing separate debuginfo for /lib64/libxml2.so.2
Try: urpmi  /usr/lib/debug/.build-id/84/61bb69dca9ebc726cf87e853c540dd04e59df5.debug
[New Thread 0x7ffff2e0d700 (LWP 10140)]
[New Thread 0x7ffff260c700 (LWP 10141)]
[New Thread 0x7ffff1e0b700 (LWP 10142)]
[New Thread 0x7ffff160a700 (LWP 10143)]
[New Thread 0x7ffff0e09700 (LWP 10144)]
[Thread 0x7ffff160a700 (LWP 10143) exited]
[Thread 0x7ffff1e0b700 (LWP 10142) exited]

(gnome-photos:10135): Grilo-[1;33mWARNING[0m **: [registry] grl-registry.c:1255: Could not open directory '/usr/lib64/grilo-0.3': Error opening directory '/usr/lib64/grilo-0.3': No such file or directory

(gnome-photos:10135): Grilo-[1;33mWARNING[0m **: [registry] grl-registry.c:1362: Plugin 'grl-flickr' not available

** (gnome-photos:10135): [1;33mWARNING[0m **: Unable to activate Grilo's Flickr plugin: Plugin 'grl-flickr' not available
[New Thread 0x7ffff160a700 (LWP 10150)]

(gnome-photos:10135): GLib-GIO-[1;31mERROR[0m **: Settings schema 'org.freedesktop.Tracker.Miner.Files' is not installed


Thread 1 "gnome-photos" received signal SIGTRAP, Trace/breakpoint trap.
_g_log_abort (breakpoint=1) at gmessages.c:509
509	}
(gdb) bt full
#0  0x0000003c9c24f0c1 in _g_log_abort (breakpoint=1) at gmessages.c:509
        debugger_present = 1
#1  0x0000003c9c2500f9 in g_log_default_handler (log_domain=log_domain@entry=0x3ca630c01d "GLib-GIO", log_level=log_level@entry=6, message=message@entry=0x122e860 "Settings schema 'org.freedesktop.Tracker.Miner.Files' is not installed\n", unused_data=unused_data@entry=0x0) at gmessages.c:2896
        domains = <optimized out>
        fields = 
            {{key = 0x3c9c29a7f6 "GLIB_OLD_LOG_API", value = 0x3c9c2eee80, length = -1}, {key = 0x3c9c29a710 "MESSAGE", value = 0x122e860, length = -1}, {key = 0x3c9c29a723 "PRIORITY", value = 0x3c9c294b5a, length = -1}, {key = 0x3c9c29a77d "GLIB_DOMAIN", value = 0x3ca630c01d, length = -1}}
        n_fields = <optimized out>
#2  0x0000003c9c250414 in g_logv (log_domain=0x3ca630c01d "GLib-GIO", log_level=G_LOG_LEVEL_ERROR, format=<optimized out>, args=args@entry=0x7fffffffbad8)
    at gmessages.c:1297
        domain = 0x0
        data = 0x0
        depth = 1
        log_func = 0x3c9c250040 <g_log_default_handler>
        domain_fatal_mask = <optimized out>
        masquerade_fatal = 0
        test_level = 6
        was_fatal = <optimized out>
        was_recursion = <optimized out>
        msg = 0x122e860 "Settings schema 'org.freedesktop.Tracker.Miner.Files' is not installed\n"
        msg_alloc = 0x122e860 "Settings schema 'org.freedesktop.Tracker.Miner.Files' is not installed\n"
        i = 2
#3  0x0000003c9c250612 in g_log (log_domain=log_domain@entry=0x3ca630c01d "GLib-GIO", log_level=log_level@entry=G_LOG_LEVEL_ERROR, format=format@entry=0x3ca633b498 "Settings schema '%s' is not installed\n") at gmessages.c:1359
Python Exception <class 'gdb.error'> Attempt to dereference a generic pointer.: 
#4  0x0000003ca630280f in g_settings_set_property (object=0x10ffdc0 [GSettings], prop_id=<optimized out>, value=<optimized out>, pspec=<optimized out>)
    at gsettings.c:590
        default_source = <optimized out>
        schema_id = 0x9bfda0 "org.freedesktop.Tracker.Miner.Files"
        settings = 0x10ffdc0 [GSettings]
        __func__ = "g_settings_set_property"
#5  0x0000003c9ca152e3 in object_set_property (nqueue=0x1203980, value=<optimized out>, pspec=0x9ece90 [GParamString], object=0x10ffdc0 [GSettings])
    at gobject.c:1423
        tmp_value = 
              {g_type = 64, data = {{v_int = 10223008, v_uint = 10223008, v_long = 10223008, v_ulong = 10223008, v_int64 = 10223008, v_uint64 = 10223008, v_float = 1.43254854e-38, v_double = 5.0508370499602302e-317, v_pointer = 0x9bfda0}, {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}}}
        class = 0x9e9e50
        param_id = 2
        redirect = <optimized out>
        value = <optimized out>
        pspec = <optimized out>
        j = <optimized out>
        node = 0xb30030 = {0x9ece90, 0x9ecf20}
        nqueue = 0x1203980
        object = 0x10ffdc0 [GSettings]
---Type <return> to continue, or q <return> to quit---
        __func__ = "g_object_new_internal"
#6  0x0000003c9ca152e3 in g_object_new_internal (class=class@entry=0x9e9e50, params=params@entry=0x7fffffffbd50, n_params=n_params@entry=1) at gobject.c:1817
        value = <optimized out>
        pspec = <optimized out>
        j = <optimized out>
        node = 0xb30030 = {0x9ece90, 0x9ecf20}
        nqueue = 0x1203980
        object = 0x10ffdc0 [GSettings]
        __func__ = "g_object_new_internal"
#7  0x0000003c9ca16d35 in g_object_new_valist (object_type=object_type@entry=10724208, first_property_name=first_property_name@entry=0x3ca633bfc3 "schema-id", var_args=var_args@entry=0x7fffffffbea8) at gobject.c:2042
        stack_params = 
            {{pspec = 0x9ece90 [GParamString], value = 0x7fffffffbca0}, {pspec = 0x8, value = 0x7fffffffbe80}, {pspec = 0x7fffffffbda4, value = 0x7fffffffbe70}, {pspec = 0xa3ca40, value = 0xe2}, {pspec = 0x1c93db57, value = 0x724f6d}, {pspec = 0x17, value = 0x0}, {pspec = 0x7fffffffbde4, value = 0x3c99c214e0}, {pspec = 0x7fffffffbf10, value = 0x7fffffffbf38}, {pspec = 0x0, value = 0x3c99c21188}, {pspec = 0x0, value = 0x3c99a099c0 <_dl_lookup_symbol_x+320>}, {pspec = 0x18, value = 0x0}, {pspec = 0x5, value = 0x0}, {pspec = 0x1, value = 0x3c99c21188}, {pspec = 0x7ffff7fa0060, value = 0x3c99a099c0 <_dl_lookup_symbol_x+320>}, {pspec = 0x1c, value = 0x0}, {pspec = 0x3c99c214e0, value = 0x7fffffffbe80}}
        params = 0x7fffffffbd50
        name = <optimized out>
        n_params = 1
        class = <optimized out>
        unref_class = <optimized out>
        object = <optimized out>
        __func__ = "g_object_new_valist"
#8  0x0000003c9ca17084 in g_object_new (object_type=10724208, first_property_name=first_property_name@entry=0x3ca633bfc3 "schema-id") at gobject.c:1626
Python Exception <class 'gdb.error'> Attempt to dereference a generic pointer.: 
#9  0x0000003ca63037c5 in g_settings_new (schema_id=schema_id@entry=0x497c08 "org.freedesktop.Tracker.Miner.Files") at gsettings.c:965
        __func__ = "g_settings_new"
#10 0x000000000045ffa8 in photos_query_builder_filter_local ()
    at photos-query-builder.c:373
        settings = <optimized out>
        tracker_filter = <optimized out>
        desktop_uri = <optimized out>
        download_uri = <optimized out>
        export_path = <optimized out>
        export_uri = <optimized out>
        filter = <optimized out>
        path = <optimized out>
        pictures_uri = <optimized out>
        tracker_dirs = <optimized out>
        i = <optimized out>
#11 0x00000000004326e8 in photos_base_manager_get_all_filter (self=<optimized out>) at photos-base-manager.c:390
        str = <optimized out>
        filterable = 0x86c100
        id = <optimized out>
        l = 0x9ede00 = {0x86c100, 0x86c0c0}
        values = 0x9ede00 = {0x86c100, 0x86c0c0}
        blank = 0x48f086 "(true)"
        filter = <optimized out>
        strv = 0x122abe0
---Type <return> to continue, or q <return> to quit---
        tmp = <optimized out>
        i = 0
        length = <optimized out>
#12 0x000000000045fb8d in photos_query_builder_filter (flags=8, state=0x841740)
    at photos-query-builder.c:53
        sparql = <optimized out>
        src_mngr_filter = <optimized out>
        srch_mtch_mngr_filter = <optimized out>
        srch_typ_mngr_filter = <optimized out>
        count_items = 0x4975a9 "COUNT (?item) AS ?count"
        item_defined = 0
        filter = 0x0
        sparql = <optimized out>
        where_sparql = 0x1200390 "WHERE { ?urn a nmm:Photo  }"
#13 0x000000000045fb8d in photos_query_builder_where (state=state@entry=0x841740, global=global@entry=1, flags=8) at photos-query-builder.c:124
        count_items = 0x4975a9 "COUNT (?item) AS ?count"
        item_defined = 0
        filter = 0x0
        sparql = <optimized out>
        where_sparql = 0x1200390 "WHERE { ?urn a nmm:Photo  }"
#14 0x000000000045fd8c in photos_query_builder_query (offset_cntrlr=0x11f7b60 [PhotosOffsetOverviewController], flags=<optimized out>, global=1, state=0x841740) at photos-query-builder.c:154
        sparql = <optimized out>
        tail_sparql = 0x0
        where_sparql = <optimized out>
#15 0x000000000045fd8c in photos_query_builder_global_query (state=0x841740, flags=<optimized out>, offset_cntrlr=0x11f7b60 [PhotosOffsetOverviewController])
    at photos-query-builder.c:296
#16 0x000000000046e619 in photos_tracker_controller_perform_current_query (self=0x1136ea0 [PhotosTrackerOverviewController]) at photos-tracker-controller.c:208
#17 0x000000000046e619 in photos_tracker_controller_refresh_internal (self=0x1136ea0 [PhotosTrackerOverviewController], flags=<optimized out>)
    at photos-tracker-controller.c:291
#18 0x000000000046eebf in photos_tracker_controller_start (self=<optimized out>) at photos-tracker-controller.c:540
#19 0x0000000000473550 in photos_view_container_constructed (object=<optimized out>) at photos-view-container.c:380
        self = 0x11fc1e0 [PhotosViewContainer]
        accessible = <optimized out>
        action = <optimized out>
        app = 0x84a1e0 [PhotosApplication]
        generic_view = 0x1218270 [GdMainIconView]
        grid = 0x11dccc0 [GtkGrid]
        state = 0x841740
        selection_mode = <optimized out>
        status = <optimized out>
        size = <optimized out>
        __func__ = "photos_view_container_constructed"
#20 0x0000003c9ca154d7 in g_object_new_internal (class=class@entry=0x11f9cb0, params=params@entry=0x7fffffffc340, n_params=n_params@entry=4) at gobject.c:1823
        nqueue = 0x117e780
        object = 0x11fc1e0 [PhotosViewContainer]
        __func__ = "g_object_new_internal"
#21 0x0000003c9ca16d35 in g_object_new_valist (object_type=object_type@entry=18848672, first_property_name=first_property_name@entry=0x49a6ef "homogeneous", var_args=var_args@entry=0x7fffffffc498) at gobject.c:2042
---Type <return> to continue, or q <return> to quit---
        stack_params = 
            {{pspec = 0x1090910 [GParamBoolean], value = 0x7fffffffc290}, {pspec = 0x11f9030 [GParamEnum], value = 0x7fffffffc260}, {pspec = 0x1136c10 [GParamString], value = 0x7fffffffc230}, {pspec = 0x108a3a0 [GParamEnum], value = 0x7fffffffc200}, {pspec = 0x50, value = 0x53c0}, {pspec = 0x11f9c40, value = 0x0}, {pspec = 0x108b800, value = 0x3c9a27f573 <calloc+195>}, {pspec = 0x9e4420, value = 0x50}, {pspec = 0x824460, value = 0x0}, {pspec = 0x7fffffffc520, value = 0x3c9c24ecb1 <g_malloc0+33>}, {pspec = 0x11f9ba0, value = 0x3c9ca2d2a7 <type_data_make_W+151>}, {pspec = 0x1, value = 0x11f9ba0}, {pspec = 0x49a686, value = 0x7fffffffc520}, {pspec = 0x11f9ba0, value = 0x49a686}, {pspec = 0x7fffffffc520, value = 0x3c9ca317e3 <g_type_register_static+483>}, {pspec = 0x7fffffffc500, value = 0x119aec0}}
        params = 0x7fffffffc340
        name = <optimized out>
        n_params = 4
        class = <optimized out>
        unref_class = <optimized out>
        object = <optimized out>
        __func__ = "g_object_new_valist"
#22 0x0000003c9ca17084 in g_object_new (object_type=18848672, first_property_name=first_property_name@entry=0x49a6ef "homogeneous") at gobject.c:1626
Python Exception <class 'gdb.error'> Attempt to dereference a generic pointer.: 
#23 0x000000000047362c in photos_view_container_new (mode=mode@entry=PHOTOS_WINDOW_MODE_OVERVIEW, name=0x7ffff7ff55f2 "Photos") at photos-view-container.c:501
#24 0x000000000044266e in photos_embed_init (self=0x1096360 [PhotosEmbed])
    at photos-embed.c:666
        app = <optimized out>
        windows = 0x9e4420 = {0x1054450}
        model = <optimized out>
        searchbar = <optimized out>
        state = 0x841740
        querying = <optimized out>
        name = <optimized out>
#25 0x0000003c9ca328f9 in g_type_create_instance (type=<optimized out>)
    at gtype.c:1866
        instance = 0x1096360 [PhotosEmbed]
        class = 0x1068800
        allocated = <optimized out>
        private_size = <optimized out>
        ivar_size = <optimized out>
        i = 0
#26 0x0000003c9ca14f6b in g_object_new_internal (class=class@entry=0x1068800, params=params@entry=0x0, n_params=n_params@entry=0) at gobject.c:1783
        nqueue = 0x0
        object = <optimized out>
        __func__ = "g_object_new_internal"
#27 0x0000003c9ca16781 in g_object_newv (object_type=object_type@entry=18020352, n_parameters=n_parameters@entry=0, parameters=parameters@entry=0x0)
    at gobject.c:1930
        class = <optimized out>
        unref_class = <optimized out>
        object = <optimized out>
        __func__ = "g_object_newv"
#28 0x0000003c9ca1709c in g_object_new (object_type=18020352, first_property_name=first_property_name@entry=0x0) at gobject.c:1623
Python Exception <class 'gdb.error'> Attempt to dereference a generic pointer.: 
#29 0x00000000004434c9 in photos_embed_new () at photos-embed.c:784
#30 0x000000000044e108 in photos_main_window_constructed (object=<optimized out>) at photos-main-window.c:385
        self = 0x1054450 [PhotosMainWindow]
---Type <return> to continue, or q <return> to quit---
        app = 0x84a1e0 [PhotosApplication]
#31 0x0000003c9ca154d7 in g_object_new_internal (class=class@entry=0x10515d0, params=params@entry=0x7fffffffcbb0, n_params=n_params@entry=6) at gobject.c:1823
        nqueue = 0x104a000
        object = 0x1054450 [PhotosMainWindow]
        __func__ = "g_object_new_internal"
#32 0x0000003c9ca16d35 in g_object_new_valist (object_type=object_type@entry=17112784, first_property_name=first_property_name@entry=0x493ff0 "width_request", var_args=var_args@entry=0x7fffffffcd08) at gobject.c:2042
        stack_params = 
            {{pspec = 0x888320 [GParamInt], value = 0x7fffffffcb00}, {pspec = 0x8883a0 [GParamInt], value = 0x7fffffffcad0}, {pspec = 0x8d9060 [GParamObject], value = 0x7fffffffcaa0}, {pspec = 0x89f550 [GParamString], value = 0x7fffffffca70}, {pspec = 0x8c21b0 [GParamEnum], value = 0x7fffffffca40}, {pspec = 0x1052820 [GParamBoolean], value = 0x7fffffffca10}, {pspec = 0x50, value = 0x19810}, {pspec = 0x10527f0, value = 0x0}, {pspec = 0x104cfb0, value = 0x3c9a27f573 <calloc+195>}, {pspec = 0x7fffffffd020, value = 0x50}, {pspec = 0x824460, value = 0x0}, {pspec = 0x7fffffffcdb0, value = 0x3c9c24ecb1 <g_malloc0+33>}, {pspec = 0x1051ed0, value = 0x3c9ca2d2a7 <type_data_make_W+151>}, {pspec = 0x1, value = 0x1051ed0}, {pspec = 0x493faf, value = 0x7fffffffcdb0}, {pspec = 0x1051ed0, value = 0x493faf}}
        params = 0x7fffffffcbb0
        name = <optimized out>
        n_params = 6
        class = <optimized out>
        unref_class = <optimized out>
        object = <optimized out>
        __func__ = "g_object_new_valist"
#33 0x0000003c9ca17084 in g_object_new (object_type=17112784, first_property_name=first_property_name@entry=0x493ff0 "width_request") at gobject.c:1626
Python Exception <class 'gdb.error'> Attempt to dereference a generic pointer.: 
#34 0x000000000044e1d5 in photos_main_window_new (application=0x84a1e0 [PhotosApplication]) at photos-main-window.c:474
        __func__ = "photos_main_window_new"
#35 0x000000000042eb0f in photos_application_create_window (self=0x84a1e0 [PhotosApplication]) at photos-application.c:648
        self = 0x84a1e0 [PhotosApplication]
        gexiv2_initialized = <optimized out>
        gexiv2_registered_namespace = <optimized out>
#36 0x0000000000431868 in photos_application_activate (application=<optimized out>) at photos-application.c:1529
        self = 0x84a1e0 [PhotosApplication]
#40 0x0000003c9ca2a812 in <emit signal ??? on instance 0x84a1e0 [PhotosApplication]> (instance=instance@entry=0x84a1e0, signal_id=<optimized out>, detail=detail@entry=0) at gsignal.c:3447
Python Exception <class 'gdb.error'> Attempt to dereference a generic pointer.: 
#41 0x0000003ca629c70b in g_application_activate (application=application@entry=0x84a1e0 [PhotosApplication]) at gapplication.c:2148
        __func__ = "g_application_activate"
#42 0x0000003ca629ce96 in g_application_real_local_command_line (application=0x84a1e0 [PhotosApplication], arguments=0x7fffffffd3e0, exit_status=0x7fffffffd3dc) at gapplication.c:1045
        error = 0x0
        n_args = 1
#43 0x0000003ca629d082 in g_application_run (application=0x84a1e0 [PhotosApplication], argc=argc@entry=1, argv=argv@entry=0x7fffffffd538)
    at gapplication.c:2350
        arguments = 0x86edd0
        status = -1
        context = 0x857c40
---Type <return> to continue, or q <return> to quit---
        acquired_context = <optimized out>
        __func__ = "g_application_run"
#44 0x000000000042d0d7 in main (argc=1, argv=0x7fffffffd538)
    at photos-main.c:72
        counter_arena = <optimized out>
        app = 0x84a1e0 [PhotosApplication]
        remote_display_mngr = 0x7fffe4005b30 [PhotosRemoteDisplayManager]
        exit_status = <optimized out>
(gdb) 
(gdb) q
A debugging session is active.

	Inferior 1 [process 10135] will be killed.

Quit anyway? (y or n) y
shlomif@telaviv1:~$ exit
exit

Script done on Thu 16 Feb 2017 13:26:17 IST