From: Noam Postavsky <npostavs@gmail.com>
To: Pierre Neidhardt <mail@ambrevar.xyz>
Cc: Stefan Kangas <stefan@marxist.se>,
28329@debbugs.gnu.org, Pierre Neidhardt <ambrevar@gmail.com>
Subject: bug#28329: 25.2; Eshell: 40M+ output: Stack overflow in regexp matcher
Date: Sun, 30 Jun 2019 09:45:16 -0400 [thread overview]
Message-ID: <87h8875gr7.fsf@gmail.com> (raw)
In-Reply-To: <87d0ivipfc.fsf@ambrevar.xyz> (Pierre Neidhardt's message of "Sun, 30 Jun 2019 07:59:35 +0200")
[-- Attachment #1: Type: text/plain, Size: 611 bytes --]
Pierre Neidhardt <mail@ambrevar.xyz> writes:
> So I never got around reproducing the issue with Gentoo, and soon after
> I dropped Gentoo and moved to Guix, with which I've never been able to
> re-experience this issue, even on massive Eshell buffers (couple of 10M...).
>
> As far as I'm concerned, this could be closed, but maybe another Gentoo
> user out there would be able to tell us more.
Oh yeah, I still have a possible fix sitting in my local repo.
Attaching here for posterity, but I wouldn't want to apply it unless we
actually know that it would help (because it might break legitimate
matches).
[-- Attachment #2: patch --]
[-- Type: text/x-diff, Size: 1264 bytes --]
From 7a3bdc88941f90c5506165ddf4b9d12f51ba9ea3 Mon Sep 17 00:00:00 2001
From: Noam Postavsky <npostavs@gmail.com>
Date: Sat, 2 Sep 2017 08:17:48 -0400
Subject: [PATCH] [?] Only match password prompts in part of line (Bug#28329)
* lisp/eshell/esh-mode.el (eshell-password-prompt-regexp): Add
beginning of line anchor, and use {,80} instead of * to restrict
matches in long lines.
---
lisp/eshell/esh-mode.el | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/lisp/eshell/esh-mode.el b/lisp/eshell/esh-mode.el
index 80844c3a64..9f80700c6a 100644
--- a/lisp/eshell/esh-mode.el
+++ b/lisp/eshell/esh-mode.el
@@ -179,7 +179,10 @@ eshell-preoutput-filter-functions
:group 'eshell-mode)
(defcustom eshell-password-prompt-regexp
- (format "\\(%s\\)[^::៖]*[::៖]\\s *\\'" (regexp-opt password-word-equivalents))
+ ;; Assume prompt will show up near the beginning of a line, this
+ ;; should prevent excessive regexp searches on long lines.
+ (format "^.\\{,80\\}%s[^::៖]\\{,80\\}[::៖]\\s-*\\'"
+ (regexp-opt password-word-equivalents))
"Regexp matching prompts for passwords in the inferior process.
This is used by `eshell-watch-for-password-prompt'."
:type 'regexp
--
2.11.0
next prev parent reply other threads:[~2019-06-30 13:45 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-02 9:34 bug#28329: 25.2; Eshell: 40M+ output: Stack overflow in regexp matcher Pierre Neidhardt
2017-09-02 12:30 ` npostavs
2017-09-02 13:27 ` Pierre Neidhardt
2017-09-03 2:19 ` npostavs
2017-09-24 12:55 ` Noam Postavsky
2017-10-21 1:20 ` Noam Postavsky
2017-11-05 13:58 ` Pierre Neidhardt
2017-11-05 14:44 ` Noam Postavsky
2017-11-05 14:54 ` Pierre Neidhardt
2019-06-30 4:58 ` Stefan Kangas
2019-06-30 5:59 ` Pierre Neidhardt
2019-06-30 7:07 ` Stefan Kangas
2019-06-30 13:45 ` Noam Postavsky [this message]
2019-06-30 14:48 ` Mattias Engdegård
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