I've now got a full backtrace by attaching gdb. Hope this helps.

#0  0x009db6ff in fbBlt (srcLine=0xacd92480, srcStride=16, srcX=0, dstLine=0x147f, dstStride=16, dstX=0, width=17, 
    height=45, alu=3, pm=<value optimized out>, bpp=1, reverse=0, upsidedown=0) at ../../fb/fbblt.c:213
        __xor = <value optimized out>
        src = <value optimized out>
        dst = 0x0
        leftShift = 64
        rightShift = 5247
        startmask = 0
        endmask = 131071
        bits = <value optimized out>
        bits1 = <value optimized out>
        nmiddle = <value optimized out>
        destInvarient = 1
        startbyte = 0
        endbyte = 16
        _ca1 = 0
        _cx1 = 0
        _ca2 = 0
        _cx2 = 0
#1  0x009de7cc in fbCopyNtoN (pSrcDrawable=0xbc3fa18, pDstDrawable=0xe0e4e80, pGC=0xc25dee8, pbox=0xbfd1f454, nbox=1, 
    dx=0, dy=0, reverse=0, upsidedown=0, bitplane=0, closure=0x0) at ../../fb/fbcopy.c:77
        alu = 3 '\003'
        pm = 4294967295
        src = 0xacd91000
        srcStride = 16
        srcBpp = 1
        srcXoff = 0
        srcYoff = 0
        dst = 0xffffffff
        dstStride = 16
        dstBpp = <value optimized out>
        dstXoff = 0
        dstYoff = 0
#2  0x005239fa in uxa_copy_n_to_n (pSrcDrawable=0xbc3fa18, pDstDrawable=0xe0e4e80, pGC=0xc25dee8, pbox=0xbfd1f454, 
    nbox=1, dx=0, dy=0, reverse=0, upsidedown=0, bitplane=0, closure=0x0) at ../../uxa/uxa-accel.c:484
        src_off_x = <value optimized out>
        src_off_y = <value optimized out>
        dst_off_x = <value optimized out>
        dst_off_y = <value optimized out>
        pSrcPixmap = 0xbc3fa18
        pDstPixmap = 0xe0e4e80
        __FUNCTION__ = "uxa_copy_n_to_n"
#3  0x009dd76b in fbCopyRegion (pSrcDrawable=0xbc3fa18, pDstDrawable=0xe0e4e80, pGC=0xc25dee8, pDstRegion=0xbfd1f454, 
    dx=0, dy=0, copyProc=0x5232b0 <uxa_copy_n_to_n>, bitPlane=0, closure=0x0) at ../../fb/fbcopy.c:396
        reverse = 134688935
        upsidedown = 13697024
        pbox = <value optimized out>
        nbox = 1
        pboxNew1 = 0x81f3a34
        pboxNew2 = <value optimized out>
        pboxBase = <value optimized out>
        pboxNext = <value optimized out>
        pboxTmp = <value optimized out>
#4  0x009ddc8d in fbDoCopy (pSrcDrawable=0xbc3fa18, pDstDrawable=0xe0e4e80, pGC=0xc25dee8, xIn=0, yIn=0, widthSrc=81, 
    heightSrc=127, xOut=0, yOut=0, copyProc=0x5232b0 <uxa_copy_n_to_n>, bitPlane=0, closure=0x0) at ../../fb/fbcopy.c:596
        prgnSrcClip = 0x0
        freeSrcClip = 0
        prgnExposed = <value optimized out>
        rgnDst = {extents = {x1 = 0, y1 = 82, x2 = 17, y2 = 127}, data = 0x0}
        dx = 0
        dy = 0
        box_x1 = 0
        box_y1 = 127
        box_x2 = <value optimized out>
        box_y2 = <value optimized out>
        fastSrc = 1
        fastDst = 1
        fastExpose = 1
#5  0x00523258 in uxa_copy_area (pSrcDrawable=0xbc3fa18, pDstDrawable=0xe0e4e80, pGC=0xc25dee8, srcx=0, srcy=0, 
    width=81, height=127, dstx=0, dsty=0) at ../../uxa/uxa-accel.c:503
No locals.
#6  0x08181593 in damageCopyArea (pSrc=0xbc3fa18, pDst=0xe0e4e80, pGC=0xc25dee8, srcx=0, srcy=0, width=81, height=127, 
    dstx=0, dsty=0) at ../../../miext/damage/damage.c:949
        ret = 0x81e5ff4
        pGCPriv = 0xb9c60e0
        oldFuncs = 0x81eca80
#7  0x0808b4c5 in ProcCopyArea (client=0xb86aa08) at ../../dix/dispatch.c:1575
        pDst = 0xe0e4e80
        pSrc = 0xbc3fa18
        pGC = 0xc25dee8
        pRgn = <value optimized out>
        rc = 131071
#8  0x0808d17f in Dispatch () at ../../dix/dispatch.c:456
        result = <value optimized out>
        client = 0xb86aa08
        nready = 0
        start_tick = 34840
#9  0x08072515 in main (argc=9, argv=0xbfd1f734, envp=0xbfd1f75c) at ../../dix/main.c:397
        i = <value optimized out>
        alwaysCheckForInput = {0, 1}