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bug#9401: 24.0.50; Crash during fontification


From: Chong Yidong
Subject: bug#9401: 24.0.50; Crash during fontification
Date: Tue, 30 Aug 2011 18:45:34 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

Chong Yidong <address@hidden> writes:

> I can trigger this crash about 50 percent of the time by doing
>
> emacs -q trunk/src/buffer.h
> C-s defvar
>
> Emacs then crashes with a segfault.
>
> The problem involves a call to scan_sexps_forward (frame#4) with
> from_byte larger than the byte size of the buffer.

I've found the bug, and committed a fix.  It was a problem with
find_defun_start not updating its cache variables consistently.  (Is
that optimization really necessary?  I guess we can re-examine it some
other time.)





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