From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#24358: 25.1.50; re-search-forward errors with "Variable binding depth exceeds max-specpdl-size" Date: Sat, 08 Oct 2016 17:39:10 +0300 Message-ID: <83k2dihpm9.fsf@gnu.org> References: <87twe6sx2g.fsf@users.sourceforge.net> <87eg51ng4r.fsf_-_@users.sourceforge.net> <87k2djwumn.fsf@users.sourceforge.net> <83h98nidvd.fsf@gnu.org> <87eg3rvtsf.fsf@users.sourceforge.net> Reply-To: Eli Zaretskii NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1475937630 11253 195.159.176.226 (8 Oct 2016 14:40:30 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sat, 8 Oct 2016 14:40:30 +0000 (UTC) Cc: 24358@debbugs.gnu.org, peder@klingenberg.no To: npostavs@users.sourceforge.net Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sat Oct 08 16:40:26 2016 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 1bssnN-0000jV-1G for geb-bug-gnu-emacs@m.gmane.org; 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Sat, 08 Oct 2016 10:39:02 -0400 In-reply-to: <87eg3rvtsf.fsf@users.sourceforge.net> (npostavs@users.sourceforge.net) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] 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:124213 Archived-At: > From: npostavs@users.sourceforge.net > Cc: 24358@debbugs.gnu.org, peder@klingenberg.no > Date: Sat, 08 Oct 2016 09:45:20 -0400 > > >> From: npostavs@users.sourceforge.net > >> Date: Fri, 07 Oct 2016 20:29:36 -0400 > >> Cc: 24358@debbugs.gnu.org > >> > >> npostavs@users.sourceforge.net writes: > >> > > >> >> (I'm also on GNU/Linux, Arch) I get the same max-specpdl-size error with > >> >> 25.1.50, with 24.5 (and below) I get (error "Stack overflow in regexp > >> >> matcher") > >> > >> icalendar--read-element has been fixed, but this still reproduces when > >> doing (re-search-forward ".*\\(\n.*\\)*" nil t) on the text file given > >> in the OP. > > > > Isn't that "user error"? > > Yes, but it should give "Stack overflow in regexp matcher", not overflow > the lisp stack (or assertion failure). But that's what you said (see above): "Stack overflow in regexp matcher". That's what I meant when I said "user error". > I show some more excerpts in the attached bug-24358-debug.log, but my > main finding is that string1 of re_match_2_internal is originally: > > string1=0x1835980 "DESCRIPTION;LANGUAGE= > > but then it becomes corrupted during a malloc: > > Old value = 68 'D' > New value = 0 '\000' If that string is data of a Lisp string, then a call to malloc could relocate the data. Code that holds C pointers into buffer or string text should either use SREF, or recompute the C pointer after each function call which could GC. Thanks.