Looks like my example code needed 'map'
(defun map (f l)
"map function?"
(if
(nullp l)
'()
(if (listp l)
(if (= 1 (length l))
(list (funcall f (car l)))
(if (> (length l) 1)
(cons (map f (car l))
(map f (cdr l)))))
(funcall f l)
)))
** Tags added: bionic
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https://bugs.launchpad.net/bugs/508618
Title:
Setting max-specpdl-size of 34295 allows segfaults with 'simple' elisp
Status in emacs23 package in Ubuntu:
New
Status in emacs24 package in Ubuntu:
New
Status in emacs25 package in Ubuntu:
New
Bug description:
Binary package hint: emacs23
Setting max-specpdl-size higher than 34295, and then running the following
code results in a segfault of emacs. I am
running a system of mostly 9.04 with some packages (such as this one)
upgraded. I know it's kind of pushing emacs to the limit, but still; this
seems like an arbitrary limit on emacs' otherwise diety-like functionality.
What should happen is emacs should continue to fail to execute with
"file-truename: Variable binding depth exceeds max-specpdl-size" as it does
below 34295., or at the very least when setting max-specpdl-size higher than
34295 it should warn you that you are making some kind of error if this is not
acceptable.
example code:
(defun por (pcurrent pb numberleft)
(if (= numberleft 0)
pcurrent
(por (- (+ pcurrent pb) (* pcurrent pb)) pb (- numberleft 1))))
(por 0 0.01 10000)
(setq max-lisp-eval-depth 1000000) ; this may be necessary, but doesn't
appear to be the problem
(setq max-specpdl-size 34295) ; setting this lower results in
predictable, expected behaviour - emacs refuses to run the result, citing
max-specpdl-size not high enough. Setting this higher (like...34296), results
in a segfault of emacs
emacs23:
Installé : 23.1+1-4ubuntu3
Candidat : 23.1+1-4ubuntu3
Table de version :
*** 23.1+1-4ubuntu3 0
100 /var/lib/dpkg/status
ProblemType: Bug
Architecture: amd64
DistroRelease: Ubuntu 9.04
Package: emacs23 23.1+1-4ubuntu3
ProcEnviron:
PATH=(custom, user)
LANG=fr_CA.UTF-8
SHELL=/bin/bash
SourcePackage: emacs23
Uname: Linux 2.6.28-16-generic x86_64
UnreportableReason: Ceci n'est pas un authentique paquet Ubuntu
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