Bug#554450: not fixed by 003829072853546abd973266fe9b24d803f4f5cb
Hello,
On Mon, Feb 01, 2010 at 10:00:35AM +0100, Uwe Kleine-König wrote:
> Hello,
>
> On Sat, Jan 30, 2010 at 12:31:02PM +0100, Uwe Kleine-König wrote:
> > reassign 554450 xserver-xorg-core 2:1.7.4-2
> > thanks
> >
> > Hello,
> >
> > jcristau on irc guesses that this would be fixed by
> >
> > http://cgit.freedesktop.org/xorg/xserver/commit/?h=003829072853546abd973266fe9b24d803f4f5cb
> >
> > I will try to verify this later today.
> This alone didn't help :-/
>
> I added some more tests for crtc being NULL but without success.
Actually my problem was not that crtc is NULL but that the NULL pointer
dereference already happend while calculating crtc. This didn't show up
earlier as I just now compiled without -O2.
(gdb) bt
#0 0x081cdd92 in xf86GetGammaRampSize (pScreen=0x8b77f20)
at ../../../../hw/xfree86/common/xf86cmap.c:1080
#1 0x081c8b69 in VidModeGetGammaRampSize (scrnIndex=0)
at ../../../../hw/xfree86/common/xf86VidMode.c:522
#2 0xb740c88d in ProcXF86VidModeGetGammaRampSize (client=0x8e94250)
at ../../../../../hw/xfree86/dixmods/extmod/xf86vmode.c:1606
#3 0xb740cd3d in ProcXF86VidModeDispatch (client=0x8e94250)
at ../../../../../hw/xfree86/dixmods/extmod/xf86vmode.c:1698
#4 0x0806dd87 in Dispatch () at ../../dix/dispatch.c:439
#5 0x08066b45 in main (argc=9, argv=0xbf8a8104, envp=0xbf8a812c)
at ../../dix/main.c:285
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb7446720 (LWP 1489)]
0x081cdd92 in xf86GetGammaRampSize (pScreen=0x8b77f20)
at ../../../../hw/xfree86/common/xf86cmap.c:1080
1080 RRCrtcPtr crtc = config->output[config->compat_output]->crtc->randr_crtc;
(gdb) print config->output[config->compat_output]
$1 = (xf86OutputPtr) 0x8b73668
(gdb) print config->output[config->compat_output]->crtc
$2 = (xf86CrtcPtr) 0x0
This is too hard for me. So I let this for someone with more knowledge.
While debugging I noticed that the problem isn't reliably triggered by
gnome-screensaver-command -l. From the few tries I made I think that it
doesn't happen if LVDS output is enabled or the resolution of VGA is
1024x768 (i.e. smaller than my default 1920x...).
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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