(gdb) bt
#0  0x001c3b81 in fbFetchPixel_x8r8g8b8 (bits=0xb836c800, offset=116,
    indexed=0x0) at fbcompose.c:583
#1  0x001cb80c in fbFetchTransformed (pict=0x97ad6a0, x=Variable "x" is not available.
) at fbcompose.c:3163
#2  0x001c94e5 in fbCompositeGeneral (op=1 '\001', pSrc=0x97ad6a0, pMask=0x0,
    pDst=0x90c53e0, xSrc=109, ySrc=4578, xMask=0, yMask=0, xDst=51, yDst=270,
    width=312, height=322) at fbcompose.c:3492
#3  0x001d23ad in fbComposite (op=1 '\001', pSrc=0x97ad6a0, pMask=0x0,
    pDst=0x90c53e0, xSrc=109, ySrc=4578, xMask=0, yMask=0, xDst=51, yDst=270,
    width=312, height=322) at fbpict.c:1235
#4  0x0015a001 in XAAComposite (op=1 '\001', pSrc=0x97ad6a0, pMask=0x0,
    pDst=0x90c53e0, xSrc=51, ySrc=270, xMask=0, yMask=0, xDst=51, yDst=270,
    width=312, height=322) at xaaPict.c:539
#5  0x08156d06 in cwComposite (op=1 '\001', pSrcPicture=0x97ad6a0,
    pMskPicture=0x0, pDstPicture=0x90c53e0, xSrc=51, ySrc=270, xMsk=0, yMsk=0,
    xDst=51, yDst=270, width=312, height=322) at cw_render.c:275
#6  0x08153915 in damageComposite (op=1 '\001', pSrc=0x97ad6a0, pMask=0x0,
    pDst=0x90c53e0, xSrc=51, ySrc=270, xMask=0, yMask=0, xDst=51, yDst=270,
    width=312, height=322) at damage.c:541
#7  0x08140a13 in CompositePicture (op=3 '\003', pSrc=0x97ad6a0, pMask=0x0,
    pDst=0x90c53e0, xSrc=51, ySrc=270, xMask=0, yMask=0, xDst=51, yDst=270,
    width=312, height=322) at picture.c:1780
#8  0x0814687c in ProcRenderComposite (client=0x93b9868) at render.c:752
#9  0x08143bd5 in ProcRenderDispatch (client=0x93b9868) at render.c:1992
---Type <return> to continue, or q <return> to quit---
#10 0x080869ba in Dispatch () at dispatch.c:459
#11 0x0806e3e5 in main (argc=13, argv=0xbfc8c5c4, envp=Cannot access memory at address 0x8
) at main.c:447


(gdb) bt f
#0  0x001c3b81 in fbFetchPixel_x8r8g8b8 (bits=0xb836c800, offset=116,
    indexed=0x0) at fbcompose.c:583
No locals.
#1  0x001cb80c in fbFetchTransformed (pict=0x97ad6a0, x=Variable "x" is not available.
) at fbcompose.c:3163
        y1 = 4307
        tl = 3090597888
        br = Variable "br" is not available.