Emacs crashes in `ediff-inferior-compare-regions' when lazy-lock is on

[Jens Schmidt]

This bug report will be sent to the Free Software Foundation,
 not to your local site managers!!
Please write in English, because the Emacs maintainers do not have
translators to read other languages for them.

In GNU Emacs 20.7.1 (i386-*-nt4.0.1381)
 of Tue Jun 13 2000 on buffy
configured using `configure NT'

It also happens on

GNU Emacs 20.6.1 (i386-suse-linux, X toolkit)
 of Sat Mar 25 2000 on Kneser


Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

Start emacs with the following .emacs:

---.emacs---
(global-font-lock-mode 1)
(setq font-lock-support-mode 'lazy-lock-mode)
---.emacs---

Then do an `ediff-files' with the following files xxx.el and yyy.el:

---xxx.el---
(global-font-lock-mode 1)
(identity t)
(setq font-lock-support-mode 'lazy-lock-mode)
---xxx.el---

---yyy.el---
(global-font-lock-mode 1)
(ignore)
(setq font-lock-support-mode 'lazy-lock-mode)
---yyy.el---

Then use the following sequence to make Emacs crash:

n C-x 5 o
C-SPC C-n
C-x o
C-SPC C-n
C-x 5 o =

On Linux, Emacs just dies, on NT Dr. Watson pops up.  Attached is
the drwtsn32.log.

Regards

Jens

drwtsn32.log
Description: Binary data