Network Manager crashes after a configuration is added and a connection is attempted.

[Chris Hessing <chsoftworks gmail com>]

Hi all,

I'm using QT to speak to Network Manager over DBus and set up 
configurations on a fully updated Fedora 20 machine.   When I attempt to 
set up a TLS configuration, everything works fine when I call 
AddConnection.   However, when I call ActivateConnection to attempt to 
connect using the profile I created, Network Manager will crash.

When I attached to the Network Manager process with gdb, I was able to 
get the following backtrace :

#0  0x00007fa506041cfd in dbus_g_proxy_begin_call (proxy=<optimized 
out>, method=<optimized out>, notify=<optimized out>,
    user_data=<optimized out>, destroy=<optimized out>, 
first_arg_type=<optimized out>) at dbus-gproxy.c:2585
#1  0x00007fa507be679a in add_network_cb ()
#2  0x00007fa505df5782 in complete_pending_call_and_unlock 
(connection=connection entry=0x7fa509d1ccd0, pending=0x7fa509dbf110,
    message=message entry=0x7fa509da9a10) at dbus-connection.c:2314
#3  0x00007fa505df89b1 in dbus_connection_dispatch 
(connection=connection entry=0x7fa509d1ccd0) at dbus-connection.c:4580
#4  0x00007fa506039d65 in message_queue_dispatch 
(source=source entry=0x7fa509d0eb70, callback=<optimized out>,
    user_data=<optimized out>) at dbus-gmain.c:90
#5  0x00007fa503c2a2a6 in g_main_dispatch (context=0x7fa509d061a0) at 
gmain.c:3066
#6  g_main_context_dispatch (context=context entry=0x7fa509d061a0) at 
gmain.c:3642
#7  0x00007fa503c2a628 in g_main_context_iterate 
(context=0x7fa509d061a0, block=block entry=1, dispatch=dispatch entry=1,
    self=<optimized out>) at gmain.c:3713
#8  0x00007fa503c2aa3a in g_main_loop_run (loop=0x7fa509d06060) at 
gmain.c:3907
#9  0x00007fa507b5bdc5 in main ()




Enabling logging in Network Manager results in the following logging 
information being recorded (slightly edited to remove some identifying 
information) :

Jul 01 15:21:30 localhost.localdomain NetworkManager[3938]: <info> 
Config: added 'ssid' value 'Test71'
Jul 01 15:21:30 localhost.localdomain NetworkManager[3938]: <info> 
Config: added 'scan_ssid' value '1'
Jul 01 15:21:30 localhost.localdomain NetworkManager[3938]: <info> 
Config: added 'key_mgmt' value 'WPA-EAP'
Jul 01 15:21:30 localhost.localdomain NetworkManager[3938]: <info> 
Config: added 'auth_alg' value 'OPEN'
Jul 01 15:21:30 localhost.localdomain NetworkManager[3938]: <info> 
Config: added 'proto' value 'WPA RSN'
Jul 01 15:21:30 localhost.localdomain NetworkManager[3938]: <info> 
Config: added 'eap' value 'TLS'
Jul 01 15:21:30 localhost.localdomain NetworkManager[3938]: <info> 
Config: added 'fragment_size' value '1300'
Jul 01 15:21:30 localhost.localdomain NetworkManager[3938]: <info> 
Config: added 'ca_cert' value 
'blob://1c2062d6-5aaf-40d0-87ea-aa7f9bf696bd-ca_cert'
Jul 01 15:21:30 localhost.localdomain NetworkManager[3938]: <info> 
Config: added 'private_key' value 
'blob://1c2062d6-5aaf-40d0-87ea-aa7f9bf696bd-private_key'
Jul 01 15:21:30 localhost.localdomain NetworkManager[3938]: <info> 
Config: added 'client_cert' value 
'blob://1c2062d6-5aaf-40d0-87ea-aa7f9bf696bd-client_cert'
Jul 01 15:21:30 localhost.localdomain NetworkManager[3938]: <info> 
Config: added 'identity' value '<removed>'
Jul 01 15:21:30 localhost.localdomain NetworkManager[3938]: <info> 
Config: added 'bgscan' value 'simple:30:-65:300'
Jul 01 15:21:30 localhost.localdomain NetworkManager[3938]: <info> 
Config: added 'proactive_key_caching' value '1'
Jul 01 15:21:30 localhost.localdomain NetworkManager[3938]: <info> 
Activation (wls35u1) Stage 2 of 5 (Device Configure) complete.
Jul 01 15:21:30 localhost.localdomain NetworkManager[3938]: <info> 
Config: set interface ap_scan to 1
Jul 01 15:21:30 localhost.localdomain NetworkManager[3938]: 
(NetworkManager:3938): GLib-GObject-WARNING **: gtype.c:4215: type id 
'115' is invalid
Jul 01 15:21:30 localhost.localdomain NetworkManager[3938]: 
(NetworkManager:3938): GLib-GObject-WARNING **: can't peek value table 
for type '<unknown>' which is not currently referenced
Jul 01 15:21:30 localhost.localdomain NetworkManager[3938]: 
(NetworkManager:3938): GLib-GObject-WARNING **: gvalue.c:190: cannot 
initialize GValue with type '(null)', this type has no GTypeValueTable 
implementation
Jul 01 15:21:30 localhost.localdomain NetworkManager[3938]: 
(NetworkManager:3938): GLib-GObject-WARNING **: gtype.c:4215: type id 
'0' is invalid
Jul 01 15:21:30 localhost.localdomain NetworkManager[3938]: 
(NetworkManager:3938): GLib-GObject-WARNING **: can't peek value table 
for type '<invalid>' which is not currently referenced
Jul 01 15:21:30 localhost.localdomain kernel: NetworkManager[3938]: 
segfault at 8 ip 00007fa4b0e72cfd sp 00007fff710580d0 error 4 in 
libdbus-glib-1.so.2.2.2[7fa4b0e60000+26000]





I thought it might be an issue with the variant type I was sending in to 
some configuration setting that was later being parsed when I requested 
the connection become active.   However, after going through my code to 
generate the settings, they all match what is documented here : 
https://developer.gnome.org/NetworkManager/0.9/ref-settings.html

One interesting tidbit is that after Network Manager crashes, and is 
restarted by the system, the connection comes up fine and seems to work 
from then on.

At this point, short of cracking open the Network Manager code, I am 
running out of ideas as to what it could be.   Perhaps someone that 
understands the Network Manager code can shed some light on what might 
be going on?

Thanks!