bug#31245: 27.0.50; Crash in Windows emacs

[Eli Zaretskii]

> From: Andy Moreton <andrewjmoreton@gmail.com>
> Date: Mon, 23 Apr 2018 14:51:34 +0100
> 
> I am seeing occasional crashes in emacs, but am currently unable to
> run gdb on my machine at $work.
> 
> Decoding emacs_backtrace.txt gives:
> 
> w32_backtrace at C:/emacs/git/emacs/master/src/w32fns.c:10645
> emacs_abort at C:/emacs/git/emacs/master/src/w32fns.c:10680
> bidi_pop_it at C:/emacs/git/emacs/master/src/bidi.c:946
> pop_it at C:/emacs/git/emacs/master/src/xdisp.c:6265
> next_overlay_string at C:/emacs/git/emacs/master/src/xdisp.c:5662
> set_iterator_to_next at C:/emacs/git/emacs/master/src/xdisp.c:7779
> move_it_in_display_line_to at C:/emacs/git/emacs/master/src/xdisp.c:9230
> move_it_to at C:/emacs/git/emacs/master/src/xdisp.c:9480
> partial_line_height at C:/emacs/git/emacs/master/src/xdisp.c:10047
> try_window at C:/emacs/git/emacs/master/src/xdisp.c:17759
> redisplay_window at C:/emacs/git/emacs/master/src/xdisp.c:17181

Thanks, but this kind of problems is impossible to debug without a
reproducer.  Can you come up with one?

Also, do all the crashes you see show the same backtrace?