From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Noam Postavsky Newsgroups: gmane.emacs.bugs Subject: bug#30626: 26.0.91; Crash when traversing a `stream-of-directory-files' Date: Sun, 04 Mar 2018 10:56:36 -0500 Message-ID: <87fu5f3kcr.fsf@gmail.com> References: <87inaiss6l.fsf@web.de> <6FCF6ACA-4F29-4B6B-BE9D-D7130C6E9495@gnu.org> <87fu5moe4c.fsf@web.de> <877eqyocro.fsf@web.de> <83zi3uz4nb.fsf@gnu.org> <87lgfd52by.fsf@gmail.com> <87bmg91ity.fsf@web.de> <83h8q1yuin.fsf@gnu.org> <87po4pnl0a.fsf@web.de> <837eqxyqoe.fsf@gnu.org> <87lgfdnf86.fsf@web.de> <87muzs11hk.fsf@web.de> <87606e4lel.fsf@gmail.com> <87lgf83gun.fsf@gmail.com> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1520178915 16532 195.159.176.226 (4 Mar 2018 15:55:15 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sun, 4 Mar 2018 15:55:15 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.90 (gnu/linux) Cc: Michael Heerdegen , Nicolas Petton , 30626@debbugs.gnu.org To: John Mastro Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sun Mar 04 16:55:11 2018 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 1esVyc-0003Cy-Cg for geb-bug-gnu-emacs@m.gmane.org; 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[45.2.119.34]) by smtp.googlemail.com with ESMTPSA id h63sm3803821ioa.81.2018.03.04.07.56.37 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 04 Mar 2018 07:56:37 -0800 (PST) In-Reply-To: <87lgf83gun.fsf@gmail.com> (Noam Postavsky's message of "Sat, 03 Mar 2018 18:00:00 -0500") 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:143892 Archived-At: Noam Postavsky writes: > John Mastro writes: > >> (let* ((stream0 (stream-range 1 1000000)) >> (stream stream0)) >> (setq stream0 nil) ;; <<< Inserted by compiler >> (while (not (stream-empty-p stream)) >> (cl-callf stream-rest stream))) >> >> If the code does reference stream0 later, locals clearing can't help >> you, but that's considered a "if it hurts, don't do it" situation. >> >> This probably isn't practical for Emacs, especially since it could only >> work for byte-compiled code, but thought the prior art may be of >> interest. > > Not sure how doable this solution is, but the fact that it works only > for byte-compiled code seems fine to me. The interpreted case is doomed > to fail anyway since the interpreter doesn't prune redundant variables > from closures. Hmm, I think it won't work by itself though, just doing (stream-flush (stream-range 1 1000000)) also crashes, due to the head of the stream being referenced from the C stack somewhere (I can get the address from gdb, but I can't figure out how to get to the corresponding C variable from there).