Public bug reported:
Binary package hint: libgtk2.0-0
System information: Ubuntu 9.04
Package Version: 2.16.1-0ubuntu2
I have two NVidia cards installed with the 1.73 restricted drivers. My
setup is two screens on a 6600GT, and a single screen on a FX 5200.
I rebuilt gtk from source with no optimizations, and used apport to
obtain a core dump. gdmgreeter does a SIGSEGV at
/build/buildd/gtk+2.0-2.16.1/gdk/x11/gdkvisual-x11.c:249. Examination of
the core dump with GDB shows that default_xvisual is a NULL pointer,
thus why there is a segfault when it tries to dereference the pointer.
default_xvisual is derived from the X11 screen structure for that
screen, which appears to be filled out correctly except that root_visual
is NULL, which is where default_xvisual comes from.
Its not clear to me whether the root_visual screen is allowed to be
NULL, but also its clear that GTK doesn't check for a NULL pointer there
either before using it, which seems to me to be a bug. However, I don't
have any X11 experience so I'm not quite sure what the action should be
if it does not have a default_xvisual (I noticed that it enumerated 72
visuals, so maybe it could just pick one as the system visual?).
The fact that the root_visual isn't filled in seems to me (without any
actual knowledge here) that its a bug in the NVidia driver (which I
realize isn't supported by Ubuntu), but if that is an acceptable to be
NULL then it should be fixed in GTK.
I would just like some direction on how GTK should be fixed (if it
should), and I'll patch it and test. Its quite annoying because I can't
start X until fixing this. :)
** Affects: gtk+2.0 (Ubuntu)
Importance: Undecided
Status: New
--
gdm crashes in libgtk2 with SIGSEGV at _gdk_visual_init (gdkvisual-x11.c:249)
https://bugs.launchpad.net/bugs/397309
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