Thread 1 "Xorg" received signal SIGSEGV, Segmentation fault.
glamor_composite_clipped_region (op=op@entry=3 '\003', source=source@entry=0x0, 
    mask=mask@entry=0x0, dest=dest@entry=0x20bcf20, 
    source_pixmap=source_pixmap@entry=0x0, mask_pixmap=mask_pixmap@entry=0x0, 
    dest_pixmap=0x20be5f0, region=0x20c1920, x_source=-1, y_source=7, x_mask=26, 
    y_mask=98, x_dest=26, y_dest=98) at glamor_render.c:1414
1414	    if (!mask && !source->alphaMap && !dest->alphaMap
(gdb) bt
#0  glamor_composite_clipped_region (op=op@entry=3 '\003', source=source@entry=0x0, 
    mask=mask@entry=0x0, dest=dest@entry=0x20bcf20, 
    source_pixmap=source_pixmap@entry=0x0, mask_pixmap=mask_pixmap@entry=0x0, 
    dest_pixmap=0x20be5f0, region=0x20c1920, x_source=-1, y_source=7, x_mask=26, 
    y_mask=98, x_dest=26, y_dest=98) at glamor_render.c:1414
#1  0x00007f0b8c44eadb in glamor_composite_largepixmap_region (op=op@entry=3 '\003', 
    source=source@entry=0x20f9610, mask=mask@entry=0x0, dest=dest@entry=0x20bcf20, 
    source_pixmap=source_pixmap@entry=0x208b1d0, mask_pixmap=mask_pixmap@entry=0x0, 
    dest_pixmap=0x20be5f0, region=0x7ffc749ce770, force_clip=0, x_source=-1, y_source=7, 
    x_mask=26, y_mask=98, x_dest=26, y_dest=98, width=2176, height=236)
    at glamor_largepixmap.c:1367
#2  0x00007f0b8c4433c8 in glamor_composite (op=<optimized out>, source=0x20f9610, 
    mask=0x0, dest=0x20bcf20, x_source=<optimized out>, y_source=<optimized out>, 
    x_mask=26, y_mask=98, x_dest=26, y_dest=98, width=2176, height=236)
    at glamor_render.c:1680
#3  0x000000000051e086 in damageComposite (op=<optimized out>, pSrc=0x20f9610, 
    pMask=<optimized out>, pDst=0x20bcf20, xSrc=<optimized out>, ySrc=<optimized out>, 
    xMask=26, yMask=98, xDst=26, yDst=98, width=2176, height=236) at damage.c:513
#4  0x000000000051380c in ProcRenderComposite (client=0x1f141f0) at render.c:695
#5  0x0000000000435838 in Dispatch () at dispatch.c:479
#6  0x0000000000439850 in dix_main (argc=14, argv=0x7ffc749cea98, envp=<optimized out>)
    at main.c:287
#7  0x00007f0b909a64da in __libc_start_main (main=0x423540 <main>, argc=14, 
    argv=0x7ffc749cea98, init=<optimized out>, fini=<optimized out>, 
    rtld_fini=<optimized out>, stack_end=0x7ffc749cea88) at ../csu/libc-start.c:295
#8  0x000000000042357a in _start ()