Re: [gdm-list] greeter restart after using wrong username

[Francis Giraldeau <francis giraldeau revolutionlinux com>]

Hi,
>>
>> When using pam_ldap or pam_winbind by XDMCP, and entering a wrong
>> credential, GDM doesn't display the standard message "wrong username or
>> passord". In place of that, the greeter reset completely and reloads, as
>> if CTRL-ALT-Backspace was pressed.
>>
>> How can I do the debug of that?
> Normally when the greeter restarts, it is because there was a crash.
> Is there a core file in your root (/) directory, or in /var/lib/gdm
> or /var/lib/log/gdm?  Sometimes gdm will leave core files here that
> we can check for a stacktrace.
I did have core dump, but I don't know if they are related to the error.
I tried to get core dump by lauchning gdm-binary on the current shell,
wich I did ulimits -c 10240, but process doesn't create the core dump.

I got the problem with gdm 2.8 and 2.16. I confirm that the
configuration is not the issue, I tested a configuration that is known
to work. I also used standard theme, and the problem is still there.

# strings /usr/sbin/gdm-binary | grep 2.1
GDM 2.16.0

Anyway, here is the backtrace I got from the core dump of gdmgreeter.
Realy strange.

#0  0xbfffe410 in __kernel_vsyscall ()
(gdb) bt
#0  0xbfffe410 in __kernel_vsyscall ()
#1  0xb7057fc0 in raise () from /lib/i686/libc.so.6
#2  0xb7059851 in abort () from /lib/i686/libc.so.6
#3  0xb705153b in __assert_fail () from /lib/i686/libc.so.6
#4  0xb75e00a2 in _cairo_image_surface_clone () from /usr/lib/libcairo.so.2
#5  0xb7607579 in cairo_xlib_surface_get_display () from
/usr/lib/libcairo.so.2
#6  0xb760797b in cairo_xlib_surface_get_display () from
/usr/lib/libcairo.so.2
#7  0xb75e8142 in cairo_surface_set_fallback_resolution () from
/usr/lib/libcairo.so.2
#8  0xb75ea048 in cairo_surface_create_similar () from
/usr/lib/libcairo.so.2
#9  0xb75ea3ae in cairo_surface_create_similar () from
/usr/lib/libcairo.so.2
#10 0xb75e85f4 in cairo_surface_reference () from /usr/lib/libcairo.so.2
#11 0xb75e87c3 in cairo_surface_reference () from /usr/lib/libcairo.so.2
#12 0xb75eb6d6 in cairo_surface_create_similar () from
/usr/lib/libcairo.so.2
#13 0xb75eb867 in cairo_surface_create_similar () from
/usr/lib/libcairo.so.2
#14 0xb75e901d in cairo_surface_reference () from /usr/lib/libcairo.so.2
#15 0xb75dcb14 in cairo_font_options_create () from /usr/lib/libcairo.so.2
#16 0xb75d7f46 in cairo_fill_preserve () from /usr/lib/libcairo.so.2
#17 0xb75d7f70 in cairo_fill () from /usr/lib/libcairo.so.2
#18 0xb7b0b144 in gdk_window_set_user_data () from
/usr/lib/libgdk-x11-2.0.so.0
#19 0xb7b0c4ad in gdk_window_begin_paint_region () from
/usr/lib/libgdk-x11-2.0.so.0
#20 0xb7c9d74c in gtk_main_do_event () from /usr/lib/libgtk-x11-2.0.so.0
#21 0xb7b0c885 in gdk_window_is_viewable () from
/usr/lib/libgdk-x11-2.0.so.0
#22 0xb7b0cabc in gdk_window_process_all_updates () from
/usr/lib/libgdk-x11-2.0.so.0
#23 0xb7c0ba74 in gtk_container_check_resize () from
/usr/lib/libgtk-x11-2.0.so.0
#24 0xb74373e0 in g_source_is_destroyed () from /usr/lib/libglib-2.0.so.0
#25 0xb74391b5 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#26 0xb743c1d2 in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#27 0xb743c544 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#28 0xb7c9d9af in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#29 0x08051365 in ?? ()
#30 0xb704575c in __libc_start_main () from /lib/i686/libc.so.6
#31 0x080503b1 in ?? ()

I got also a coredump from gdmlogin.

(gdb) bt
#0  0xb75260e3 in strlen () from /lib/i686/libc.so.6
#1  0xb7748141 in g_markup_escape_text () from /usr/lib/libglib-2.0.so.0
#2  0x080550bf in ?? ()
#3  0xb74d075c in __libc_start_main () from /lib/i686/libc.so.6
#4  0x0804f341 in ?? ()

Wired, isn't?

Francis

-- 
Francis Giraldeau