Comment 17 for bug 1284134

(gdb) bt
#0 0x00007f8d7fb3ff79 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1 0x00007f8d7fb43388 in __GI_abort () at abort.c:89
#2 0x00007f8d7fb38e36 in __assert_fail_base (fmt=0x7f8d7fc8a4b8 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x7f8d7c2f58fd "svga->curr.sampler[i]",
    file=file@entry=0x7f8d7c2f5898 "../../../../../../src/gallium/drivers/svga/svga_state_fs.c", line=line@entry=246, function=function@entry=0x7f8d7c2f595d "make_fs_key")
    at assert.c:92
#3 0x00007f8d7fb38ee2 in __GI___assert_fail (assertion=0x7f8d7c2f58fd "svga->curr.sampler[i]",
    file=0x7f8d7c2f5898 "../../../../../../src/gallium/drivers/svga/svga_state_fs.c", line=246, function=0x7f8d7c2f595d "make_fs_key") at assert.c:101
#4 0x00007f8d7c2d0f12 in ?? () from /usr/lib/x86_64-linux-gnu/libxatracker.so.2
#5 0x00007f8d7c2cd64b in ?? () from /usr/lib/x86_64-linux-gnu/libxatracker.so.2
#6 0x00007f8d7c2c9be6 in ?? () from /usr/lib/x86_64-linux-gnu/libxatracker.so.2
#7 0x00007f8d7bd87924 in u_vbuf_draw_vbo () from /usr/lib/x86_64-linux-gnu/libgallium.so.0
#8 0x00007f8d7bd0d4e4 in cso_draw_arrays () from /usr/lib/x86_64-linux-gnu/libgallium.so.0
#9 0x00007f8d7bd612ec in util_draw_user_vertex_buffer () from /usr/lib/x86_64-linux-gnu/libgallium.so.0
#10 0x00007f8d7c2a7b08 in ?? () from /usr/lib/x86_64-linux-gnu/libxatracker.so.2
#11 0x00007f8d7c2ba949 in xa_composite_done () from /usr/lib/x86_64-linux-gnu/libxatracker.so.2
#12 0x00007f8d7c52a6b0 in vmwgfx_composite_done (driver=0x7f8d82bb6650) at ../../vmwgfx/vmwgfx_saa.c:1239
#13 0x00007f8d7c532260 in saa_driver_composite (width=<optimized out>, height=<optimized out>, dst_reg=0x7fff3fab2e90, mask_reg=0x0, src_reg=0x7f8d82bb6a70,
    yDst=<optimized out>, xDst=<optimized out>, yMask=<optimized out>, xMask=<optimized out>, ySrc=14, xSrc=-10, pDst=<optimized out>, pMask=0x0, pSrc=<optimized out>,
    op=1 '\001') at ../../saa/saa_render.c:285
#14 saa_composite (op=<optimized out>, pSrc=<optimized out>, pMask=0x0, pDst=<optimized out>, xSrc=<optimized out>, ySrc=<optimized out>, xMask=0, yMask=0, xDst=0, yDst=0,
    width=1462, height=925) at ../../saa/saa_render.c:383
#15 0x00007f8d82120f84 in ?? ()
#16 0x00007f8d820d0b37 in ?? ()
#17 0x00007f8d820d1d6d in ?? ()
#18 0x00007f8d820cf2dc in ?? ()
#19 0x00007f8d8211b6a3 in ?? ()
#20 0x00007f8d8206e77f in ConfigureWindow ()
#21 0x00007f8d8203ec9b in ?? ()
#22 0x00007f8d82043a9e in ?? ()
#23 0x00007f8d8204789a in ?? ()
#24 0x00007f8d7fb2aec5 in __libc_start_main (main=0x7f8d82032e50, argc=11, argv=0x7fff3fab3408, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>,
    stack_end=0x7fff3fab33f8) at libc-start.c:285
#25 0x00007f8d82032e7e in _start ()