xf86SetGamma crashes the server [Re: xserver: Branch 'master']

[Aaron Plattner]

On Wed, Dec 17, 2008 at 08:05:24AM -0800, Maarten Maathuis wrote:
>  hw/xfree86/common/Makefile.am  |    2
>  hw/xfree86/common/xf86Helper.c |    6 +
>  hw/xfree86/common/xf86cmap.c   |    5 +
>  hw/xfree86/modes/xf86Crtc.c    |  128 ++++++++++++++++++++++++++++++++++++++++-
>  hw/xfree86/modes/xf86Crtc.h    |   16 +++++
>  hw/xfree86/modes/xf86RandR12.c |   52 ++++++++++++++++
>  randr/randrstr.h               |   12 +++
>  randr/rrcrtc.c                 |   35 ++++++++++-
>  8 files changed, 249 insertions(+), 7 deletions(-)
> 
> New commits:
> commit 91f73b79b7ae64e5b846d1efeb470bb61a913720
> Author: Maarten Maathuis <madman2003 at gmail.com>
> Date:   Wed Dec 17 16:56:26 2008 +0100
> 
>     randr: Improve per-crtc gamma support.
> 
>     - The Gamma values from the monitor section are now used during initial config.
>     - The old colormap system is disabled when gamma set hook is available.
>     - Gamma values are now persistent for the lifetime of the xserver.
>     - This requires no driver changes and should be driver ABI compatible.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7f1c582006f0 (LWP 15464)]
0x000000000047126b in xf86_crtc_supports_gamma (pScrn=0x899ac0) at /home/aaron/X/modular/xserver/hw/xfree86/modes/xf86Crtc.c:3146
3146	    for (c = 0; c < xf86_config->num_crtc; c++) {
(gdb) bt
#0  0x000000000047126b in xf86_crtc_supports_gamma (pScrn=0x899ac0) at /home/aaron/X/modular/xserver/hw/xfree86/modes/xf86Crtc.c:3146
#1  0x000000000045966b in xf86SetGamma (scrp=0x899ac0, gamma={red = 0, green = 0, blue = 0})
    at /home/aaron/X/modular/xserver/hw/xfree86/common/xf86Helper.c:925
#2  0x00007f1c54264788 in VESAPreInit (pScrn=0x899ac0, flags=<value optimized out>)
    at /home/aaron/X/modular/driver/xf86-video-vesa/src/vesa.c:640
#3  0x0000000000453ab8 in InitOutput (pScreenInfo=0x8702a0, argc=4, argv=0x7fff60336308)
    at /home/aaron/X/modular/xserver/hw/xfree86/common/xf86Init.c:1007
#4  0x0000000000428315 in main (argc=4, argv=0x7fff60336308, envp=0x7fff60336330) at /home/aaron/X/modular/xserver/dix/main.c:308
(gdb) p xf86_config
$1 = (xf86CrtcConfigPtr) 0x21
(gdb) p xf86CrtcConfigPrivateIndex
$2 = -1