Comment 22 for bug 481030

The crash from Christopher's log:

[ 463.522] (II) VBoxVideo(0): Modeline "1366x606"x0.0 50.37 1366 1368 1370 1372 606 608 610 612 -hsync -vsync (36.7 kHz)
[ 3771.137] (II) XKB: reuse xkmfile /var/lib/xkb/server-03AF3717FF3AB439A4BAABA686CCB40771CDF520.xkm
[ 3850.449]
Backtrace:
[ 3850.520] 0: /usr/bin/X (xorg_backtrace+0x37) [0xb76bd957]
[ 3850.520] 1: /usr/bin/X (0xb7536000+0x18b4ba) [0xb76c14ba]
[ 3850.520] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb751540c]
[ 3850.520] 3: /usr/lib/i386-linux-gnu/libpixman-1.so.0 (pixman_rasterize_trapezoid+0x30) [0xb7407dd0]
[ 3850.520] 4: /usr/lib/i386-linux-gnu/libpixman-1.so.0 (pixman_composite_trapezoids+0x400) [0xb7408430]
[ 3850.520] 5: /usr/lib/xorg/modules/libfb.so (0xb6f54000+0x1d464) [0xb6f71464]
[ 3850.520] 6: /usr/bin/X (CompositeTrapezoids+0xb5) [0xb7635885]
[ 3850.520] 7: /usr/bin/X (0xb7536000+0x105178) [0xb763b178]
[ 3850.520] 8: /usr/bin/X (0xb7536000+0xffe01) [0xb7635e01]
[ 3850.520] 9: /usr/bin/X (0xb7536000+0x376a5) [0xb756d6a5]
[ 3850.520] 10: /usr/bin/X (0xb7536000+0x250fa) [0xb755b0fa]
[ 3850.520] 11: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xf3) [0xb71cb113]
[ 3850.520] 12: /usr/bin/X (0xb7536000+0x25439) [0xb755b439]
[ 3850.520] Segmentation fault at address (nil)
[ 3850.520]
Caught signal 11 (Segmentation fault). Server aborting