Re: C-g crash redux

[Nick Roberts <nickrob@snap.net.nz>]

Romain Francoise writes:
 > I can crash Emacs reliably with current (Aug 2nd) sources by hitting C-g
 > while it's preparing a partial-completion-mode prompt.  I just did it
 > three times in a row.  The Lisp backtrace shows that it's indeed related
 > to sit-for:

Emacs can be made to crash simply by evaluating (sit-for 4) in the scratch
buffer and typing C-g before four seconds elapse.

It's due to this change:

2006-08-01  Kim F. Storm  <storm@cua.dk>

	* process.c (wait_reading_process_output_unwind): New function.
	Restores waiting_for_user_input_p to saved value.
	(wait_reading_process_output): Unwind protect waiting_for_user_input_p
	instead of save/restore old value on stack.

Presumably wait_reading_process_output is interrupted before it can do:

  unbind_to (count, Qnil);

-- 
Nick                                           http://www.inet.net.nz/~nickrob