Re: Cygwin/X just now started to crash with Solaris app, 8bpp UPDATE

[Alexander Gottwald <alexander dot gottwald at s1999 dot tu-chemnitz dot de>]

On Wed, 20 Oct 2004, Sebastian wrote:

> Hello again!
> I've been doing debugging and testing the last two days, and things are weird ;)
> 
> When running XWinEMU2 from gdb with mwm it both works and crashes.
> (run -ac -screen 0 1280 1024 -emulatepseudo)
> Program received signal SIGSEGV, Segmentation fault.
> 0x000000ff in ?? ()
> (gdb) bt
> #0  0x000000ff in ?? ()
> #1  0x006974be in shadowPaintWindow ()
> #2  0x00493fd5 in miClearToBackground ()
> #3  0x00497caf in miSpriteClearToBackground ()
> #4  0x00409c83 in ProcClearToBackground ()
> #5  0x00428f93 in SProcClearToBackground ()
> #6  0x004078a2 in Dispatch ()
> #7  0x004014b1 in main ()
> (gdb)
> 
> When running XWinDEBUG from inside gdb with fvwm2 it both works and crashes!
> Program received signal SIGSEGV, Segmentation fault.
> 0x00000099 in ?? ()
> (gdb) bt
> #0  0x00000099 in ?? ()
> #1  0x007836a9 in shadowPaintWindow(pWindow=0x10372188, prgn=0x22eae0, what=0) at shadow.c:1294

static void
shadowPaintWindow(
  WindowPtr pWindow,
  RegionPtr prgn,
  int what
){
    ScreenPtr pScreen = pWindow->drawable.pScreen;
    shadowScrPriv(pScreen);

    if(what == PW_BACKGROUND) {
	unwrap (pScrPriv, pScreen, PaintWindowBackground);
	(*pScreen->PaintWindowBackground) (pWindow, prgn, what);
	wrap (pScrPriv, pScreen, PaintWindowBackground, shadowPaintWindow);
    } else {
	unwrap (pScrPriv, pScreen, PaintWindowBorder);
	(*pScreen->PaintWindowBorder) (pWindow, prgn, what);
	wrap (pScrPriv, pScreen, PaintWindowBorder, shadowPaintWindow);
    }

it seems pScreen is not initialized properly (most likely it is NULL). Don't 
know how this can happen. 

> From the dgb output I plan to start looking into the shadowPaintWindow () function as that function seem to be causing the following "0x000000ff in ??

bye
	ago
-- 
 Alexander.Gottwald@s1999.tu-chemnitz.de 
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