From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: npostavs@users.sourceforge.net Newsgroups: gmane.emacs.bugs Subject: bug#25391: 24.5; ffap-guesser "stack overflow in regexp matcher" error may crash emacs. Date: Sun, 08 Jan 2017 10:08:50 -0500 Message-ID: <87y3yl1tdp.fsf@users.sourceforge.net> References: <87vatqc8j1.fsf@gmail.com> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1483888100 2503 195.159.176.226 (8 Jan 2017 15:08:20 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sun, 8 Jan 2017 15:08:20 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux) Cc: 25391@debbugs.gnu.org To: Thierry Volpiatto Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sun Jan 08 16:08:15 2017 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cQF4q-0007fq-9m for geb-bug-gnu-emacs@m.gmane.org; Sun, 08 Jan 2017 16:08:08 +0100 Original-Received: from localhost ([::1]:33696 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cQF4t-0005Zl-GF for geb-bug-gnu-emacs@m.gmane.org; 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Sun, 08 Jan 2017 15:08:02 +0000 Original-Received: (at 25391) by debbugs.gnu.org; 8 Jan 2017 15:07:54 +0000 Original-Received: from localhost ([127.0.0.1]:47009 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cQF4b-0003uN-S6 for submit@debbugs.gnu.org; Sun, 08 Jan 2017 10:07:54 -0500 Original-Received: from mail-it0-f41.google.com ([209.85.214.41]:35028) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cQF4a-0003u8-Vm for 25391@debbugs.gnu.org; Sun, 08 Jan 2017 10:07:53 -0500 Original-Received: by mail-it0-f41.google.com with SMTP id c20so40845694itb.0 for <25391@debbugs.gnu.org>; Sun, 08 Jan 2017 07:07:53 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:references:date:in-reply-to:message-id :user-agent:mime-version; bh=u58dTnF6p15WVF8F99PPkeofupZx9x0ku1asJrv13cc=; b=QgJtbGxWC3xAEjXzrDxa2tR1SLNDCikChCUONvwaQMD9LOGQ5hJcljaSGfjaVP5Tuc T9zQA2WZHnQ8n/99S24+iTJz6O2en/6bdVdqRlYsMdEk0nR+FXUnhfihfEZatJ+AeYnT R5Sxb2hEO4hw1vSIOo7oy44pSYejFzFv94SPtUOLhcZwcwtKptlWfd+jX+//w7c3RVFS FJ6hkk4KXBtG1bWvVWGpJ4DnwJFKVgL1IL3DzUgxkVngm+pIB8PBmQeA3GBZMDM3X1aU l18AuvE5VjTzEKI+SpOwoEQb407GgI5UkfxsqX4FrQuDEJOnRP3Qwn1KDt+oFkl4bzFQ Pzpg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:references:date :in-reply-to:message-id:user-agent:mime-version; bh=u58dTnF6p15WVF8F99PPkeofupZx9x0ku1asJrv13cc=; b=RfBjxR61vEl/4Ug+2tEv1pSEL2HggEzj53VRQ+X1j07p7Dw2U7V1mdz6FNfVEhap9A WHZbze20xioPlWWUqmEriVsY3KV1gM+zbgcxso7lHsLVe4+GcCNcyIKQRgYW+qi97D+d d/oKhhYqpJsZrgaKzMQalhO26JsciXoCAosqRNnaL8AYrjPGFijcxDWRccPzKV2e1t/R 6vD6KfPoiiIkm+1/oPjMODmNdVxsdlJ8Bmj/TFi5P5vLCPkv4t1fAw3BVHJr216dxeq1 XAKieOl+n7LJMdB5M+jau4okTZEKvEgwAvsgDSkvvfUlLPp1Jo4QLISxpu8oYgLPFhhn vc/Q== X-Gm-Message-State: AIkVDXI+nBfqMjjnLF7d7GHm4TzXrbIZOK/7eoavHzYUtuAm6xunzV4HIXdtT1fKyR+QQQ== X-Received: by 10.36.68.146 with SMTP id o140mr6101280ita.33.1483888067443; Sun, 08 Jan 2017 07:07:47 -0800 (PST) Original-Received: from zony ([45.2.7.65]) by smtp.googlemail.com with ESMTPSA id f187sm4787519ita.7.2017.01.08.07.07.46 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 08 Jan 2017 07:07:46 -0800 (PST) In-Reply-To: <87vatqc8j1.fsf@gmail.com> (Thierry Volpiatto's message of "Sun, 08 Jan 2017 08:31:30 +0100") X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:127905 Archived-At: Thierry Volpiatto writes: > Reproduce from emacs -Q: > > 1) require ffap. > 2) Open a file of about 560k containing only one line, e.g > "~/emacs.d/elpa/archives/archive-contents" > 3) M-: (ffap-guesser) > > Debugger entered--Lisp error: (error "Variable binding depth exceeds max-specpdl-size") > looking-at("^.*\\<\\(Type\\|Name\\|Path\\|Host\\|Port\\) *= *\\(.*\\) *$") [...] > > This is reproductible from emacs-26 as well. The max-specpdl-size error looks like #24751 (I was planning to push the patch for that today), but as far as I know, that's only in emacs-26. emacs-25 and earlier correctly throw "stack overflow in regexp matcher". Unless you have REL_ALLOC enabled (which is the default for GNU/Linux distributions with the latest glibc), in which case any buffer search may crash emacs instead. That's #24358, occurs in 25.1 (and probably earlier), but it's already fixed in the emacs-25 branch. Also fixable by configuring with REL_ALLOC=no.