To reproduce:

1. Open the attached file using: emacs -Q --eval "(setq-default bidi-display-reordering t)"

2. Highlight the whole buffer by dragging mouse from the top-right
   corner to the bottom-left.

3. Keep selecting and deselecting region using mouse until Emacs
   aborts.

Backtrace attached.

In GNU Emacs 24.0.50.7 (i686-pc-linux-gnu, GTK+ Version 2.20.1)
 of 2010-09-10
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
configured using `configure  'CFLAGS=-g''