Loading a djvu image inside of djview and then resizing the window causes xorg  
to hang when Composite is enabled; a composite manager isn't running.  xorg 
uses up ~98% CPU and locks up the keyboard; the mouse pointer is still able to 
move.  Not even killall X -9 is able to kill X.  I'm using the xorg radeon 
driver--the video card is an ATI Radeon 9200.  
  
Backtrace of xorg after it's hung:  
  
Attaching to program: /usr/bin/X, process 22558  
Failed to read a valid object file image from memory.  
Reading symbols from /lib/libz.so.1...done.  
Loaded symbols for /lib/libz.so.1  
Reading symbols from /lib/libm.so.6...done.  
Loaded symbols for /lib/libm.so.6  
Reading symbols from /lib/libpam.so.0...done.  
Loaded symbols for /lib/libpam.so.0  
Reading symbols from /lib/libdl.so.2...done.  
Loaded symbols for /lib/libdl.so.2  
Reading symbols from /lib/libpam_misc.so.0...done.  
Loaded symbols for /lib/libpam_misc.so.0  
Reading symbols from /usr/lib/libXau.so.6...done.  
Loaded symbols for /usr/lib/libXau.so.6  
Reading symbols from /lib/libc.so.6...done.  
Loaded symbols for /lib/libc.so.6  
Reading symbols from /lib/ld-linux.so.2...done.  
Loaded symbols for /lib/ld-linux.so.2  
Reading symbols from /usr/lib/modules/fonts/libbitmap.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/fonts/libbitmap.so  
Reading symbols from /usr/lib/modules/libpcidata.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/libpcidata.so  
Reading symbols from /usr/lib/modules/extensions/libextmod.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/extensions/libextmod.so  
Reading symbols from /usr/lib/modules/extensions/libglx.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/extensions/libglx.so  
Reading symbols from /usr/lib/modules/extensions/libGLcore.so...bt  
done.  
Loaded symbols for /usr/X11R6/lib/modules/extensions/libGLcore.so  
Reading symbols from /usr/lib/modules/extensions/libdri.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/extensions/libdri.so  
Reading symbols from /usr/lib/modules/linux/libdrm.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/linux/libdrm.so  
Reading symbols from /usr/lib/modules/extensions/librecord.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/extensions/librecord.so  
Reading symbols from /usr/lib/modules/extensions/libdbe.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/extensions/libdbe.so  
Reading symbols from /usr/lib/modules/extensions/libxtrap.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/extensions/libxtrap.so  
Reading symbols from /usr/lib/modules/fonts/libfreetype.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/fonts/libfreetype.so  
Reading symbols from /usr/lib/libfreetype.so.6...done.  
Loaded symbols for /usr/lib/libfreetype.so.6  
Reading symbols from /usr/lib/modules/fonts/libtype1.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/fonts/libtype1.so  
Reading symbols from /usr/lib/modules/drivers/v4l_drv.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/drivers/v4l_drv.so  
Reading symbols from /usr/lib/modules/drivers/radeon_drv.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/drivers/radeon_drv.so  
Reading symbols from /usr/lib/modules/drivers/ati_drv.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/drivers/ati_drv.so  
Reading symbols from /usr/lib/modules/input/mouse_drv.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/input/mouse_drv.so  
Reading symbols from /usr/lib/modules/input/kbd_drv.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/input/kbd_drv.so  
Reading symbols from /usr/lib/modules/libvgahw.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/libvgahw.so  
Reading symbols from /usr/lib/modules/linux/libint10.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/linux/libint10.so  
Reading symbols from /usr/lib/modules/libddc.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/libddc.so  
Reading symbols from /usr/lib/modules/libi2c.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/libi2c.so  
Reading symbols from /usr/lib/modules/libfb.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/libfb.so  
Reading symbols from /usr/lib/modules/libramdac.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/libramdac.so  
Reading symbols from /usr/lib/modules/libxaa.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/libxaa.so  
Reading symbols from /usr/lib/modules/libshadowfb.so...done.  
Loaded symbols for /usr/X11R6/lib/modules/libshadowfb.so  
Reading symbols from   
/usr/lib/modules/multimedia/theatre_detect_drv.so...done.  
Loaded symbols for   
/usr/X11R6/lib/modules/multimedia/theatre_detect_drv.so  
0xa7f15374 in ioctl () from /lib/libc.so.6  
(gdb) bt  
#0  0xa7f15374 in ioctl () from /lib/libc.so.6  
#1  0x080acdd3 in xf86ioctl (fd=7, request=3223872553, argp=0xafffe3b0)  
    at libc_wrapper.c:465  
#2  0xa7af5de2 in drmDMA (fd=7, request=0xafffe430) at xf86drm.c:1220  
#3  0xa79bfbcb in RADEONCPGetBuffer (pScrn=0x82a34b0) at   
radeon_accel.c:537  
#4  0xa79bfe22 in RADEONCPFlushIndirect (pScrn=0x82a34b0, discard=1)  
    at radeon_accel.c:591  
#5  0xa79c0181 in RADEONHostDataBlit (pScrn=0x82a34b0, bpp=4, w=691,  
    dstPitch=2816, bufPitch=0xafffe574, dst=0xafffe594, h=0xafffe5c4,  
    hpass=0xafffe570) at radeon_accel.c:699  
#6  0xa79b2959 in R200SetupTextureCP (pScrn=0x82a34b0, format=537036936,  
    src=0x9e8aab54 "╡╡╡", src_pitch=2764, width=691, height=285,   
flags=0)  
    at radeon_render.c:804  
#7  0xa79b413f in R200SetupForCPUToScreenTextureCP (pScrn=0x82a34b0,   
op=1,  
    srcFormat=537036936, dstFormat=268567909,  
    texPtr=0x9e81f060   
"нннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪнннЪ"...,  
    texPitch=2764, width=691, height=492, flags=0) at   
radeon_render.c:928  
#8  0xa77e4825 in XAADoComposite (op=1 '\001', pSrc=0x8690770,   
pMask=0x0,  
    pDst=0x85e7b68, xSrc=0, ySrc=0, xMask=0, yMask=0, xDst=213,   
yDst=147,  
    width=691, height=492) at xaaPict.c:398  
#9  0xa77e4e8a in XAAComposite (op=1 '\001', pSrc=0x8690770, pMask=0x0,  
    pDst=0x85e7b68, xSrc=0, ySrc=0, xMask=0, yMask=0, xDst=0, yDst=0,  
    width=691, height=492) at xaaPict.c:512  
#10 0x081be8ab in cwComposite (op=1 '\001', pSrcPicture=0x8690770,  
    pMskPicture=0x0, pDstPicture=0x85e7b68, xSrc=0, ySrc=0, xMsk=0,   
yMsk=0,  
    xDst=0, yDst=0, width=691, height=492) at cw_render.c:269  
#11 0x081b171c in damageComposite (op=1 '\001', pSrc=0x8690770,   
pMask=0x0,  
    pDst=0x85e7b68, xSrc=0, ySrc=0, xMask=0, yMask=0, xDst=0, yDst=0,  
    width=691, height=492) at damage.c:517  
#12 0xa77a740d in ShadowComposite (op=1 '\001', pSrc=0x8690770,   
pMask=0x0,  
    pDst=0x85e7b68, xSrc=0, ySrc=0, xMask=0, yMask=0, xDst=0, yDst=0,  
    width=691, height=492) at shadow.c:489  
#13 0x081cae33 in CompositePicture (op=1 '\001', pSrc=0x8690770,   
pMask=0x0,  
    pDst=0x85e7b68, xSrc=0, ySrc=0, xMask=0, yMask=0, xDst=0, yDst=0,  
    width=691, height=492) at picture.c:1358  
#14 0x081ae69c in compWindowUpdateAutomatic (pWin=0x85eec48)  
    at compwindow.c:718  
#15 0x081ae742 in compWindowUpdate (pWin=0x85eec48) at compwindow.c:750  
#16 0x081ae6f4 in compWindowUpdate (pWin=0x86d51d8) at compwindow.c:743  
#17 0x081ae6f4 in compWindowUpdate (pWin=0x86d48e8) at compwindow.c:743  
#18 0x081ae6f4 in compWindowUpdate (pWin=0x831a610) at compwindow.c:743  
#19 0x081ac727 in compScreenUpdate (pScreen=0x82b9318) at compinit.c:88  
#20 0x081ac77b in compBlockHandler (i=0, blockData=0x0,   
pTimeout=0xafffed5c,  
    pReadmask=0x827e240) at compinit.c:103  
#21 0x080df6b5 in BlockHandler (pTimeout=0xafffed5c,   
pReadmask=0x827e240)  
    at dixutils.c:434  
#22 0x081084ba in WaitForSomething (pClientsReady=0xafffed94) at   
WaitFor.c:220  
#23 0x080d6240 in Dispatch () at dispatch.c:378  
#24 0x080ee56b in main (argc=9, argv=0xaffff254, envp=0xaffff27c) at   
main.c:446  
  
Some (possibly relevant) sections of my xorg.conf file:  
  
Section "Module"  
        Load  "extmod"  
        Load  "glx"  
        Load  "dri"  
        Load  "record"  
        Load  "dbe"  
        Load  "xtrap"  
        Load  "freetype"  
        Load  "type1"  
        Load  "v4l"  
EndSection  
  
Section "DRI"  
    Mode         0666  
EndSection  
  
Section "Extensions"  
     #Option "Composite" "Disable"  
     Option "Composite" "Enable"  
     Option "RENDER" "Enable"  
EndSection  
  
Section "Device"    
        Option      "AGPMode" "4"    
        Option      "EnablePageFlip" "1"    
        Option "backingstore" "1"    
        Option "DynamicClocks" "1"    
        Identifier  "Card0"    
        Driver      "radeon"    
        VendorName  "ATI Technologies Inc"    
        BoardName   "Radeon RV280 [Radeon 9200]"    
        BusID       "PCI:1:0:0"    
EndSection