[LightDM] XDMCP_ForwardQuery ?

[Martin Vogt]

On 10/30/2015 09:56 AM, Martin Vogt wrote:
> 
> 
> On 10/30/2015 12:11 AM, Robert Ancell wrote:
> But most likely it has to do with some opengl extensions
> and is not XDMCP protocol related.

Hm, I currently have a segfault.
I have modified xdmcp-server with a few printf:

>XDMCPPacket *packet;
>g_debug ("Got n_read:%ld", n_read);
>packet = xdmcp_packet_decode ((guint8 *)data, n_read);
>gchar *packet_string;
>packet_string = xdmcp_packet_tostring (packet);
>g_debug ("Got %s", packet_string);
>g_free (packet_string);
>[...]

>case XDMCP_ForwardQuery:
>g_debug ("Before XDMCP_ForwardQuery");
>handle_forward_query (server, socket, address, packet);

And i get this with "lightdm -d":


[+1.74s] DEBUG: Session pid=29832: Greeter start authentication for vogt
[+1.74s] DEBUG: Session pid=29852: Started with service 'lightdm',
username 'vogt'
[+1.76s] DEBUG: Session pid=29852: Got 1 message(s) from PAM
[+1.76s] DEBUG: Session pid=29832: Prompt greeter with 1 message(s)
[+22.33s] DEBUG: Got n_read:7
[+22.33s] DEBUG: Got Query(authentication_names=[])
[+22.33s] DEBUG: Got Query(authentication_names=[])
[+22.33s] DEBUG: Send Willing(authentication_name='' hostname='' status='')
[+24.34s] DEBUG: Got n_read:17
[+24.34s] DEBUG: Got ForwardQuery(client_address=0A881183
client_port=D01E authentication_names=[])
[+24.34s] DEBUG: Got ForwardQuery(client_address=0A881183
client_port=D01E authentication_names=[])
[+24.34s] DEBUG: Before XDMCP_ForwardQuery
[+24.34s] DEBUG: Send Willing(authentication_name='' hostname='' status='')
Segmentation fault (core dumped)



The thread apply all bt is most likely:

Thread 1 (Thread 0x7fa354616800 (LWP 29382)):
#0  0x00007fa352e08811 in __strlen_sse2_pminub () from /lib64/libc.so.6
#1  0x00007fa353ba0f73 in g_strdup () from /lib64/libglib-2.0.so.0
#2  0x0000000000422fc2 in read_cb ()
#3  0x00007fa354130383 in socket_source_dispatch () from
/lib64/libgio-2.0.so.0
#4  0x00007fa353b8399a in g_main_context_dispatch () from
/lib64/libglib-2.0.so.0
#5  0x00007fa353b83ce8 in g_main_context_iterate.isra.24 () from
/lib64/libglib-2.0.so.0
#6  0x00007fa353b83fba in g_main_loop_run () from /lib64/libglib-2.0.so.0
#7  0x0000000000407d50 in main ()


regards,

Martin