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#30626: 26.0.91; Crash when traversing a `stream-of-directory-files' Date: Wed, 28 Feb 2018 19:22:57 +0200 Message-ID: <837eqxyqoe.fsf@gnu.org> 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> Reply-To: Eli Zaretskii NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1519838532 29553 195.159.176.226 (28 Feb 2018 17:22:12 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 28 Feb 2018 17:22:12 +0000 (UTC) Cc: npostavs@gmail.com, 30626@debbugs.gnu.org To: Michael Heerdegen Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Wed Feb 28 18:22:08 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 1er5Qe-000779-42 for geb-bug-gnu-emacs@m.gmane.org; Wed, 28 Feb 2018 18:22:08 +0100 Original-Received: from localhost ([::1]:45750 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1er5Sg-00063J-IZ for geb-bug-gnu-emacs@m.gmane.org; Wed, 28 Feb 2018 12:24:14 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:54241) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1er5SY-00062q-5v for bug-gnu-emacs@gnu.org; Wed, 28 Feb 2018 12:24:07 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1er5SU-0000XN-7W for bug-gnu-emacs@gnu.org; Wed, 28 Feb 2018 12:24:06 -0500 Original-Received: from debbugs.gnu.org ([208.118.235.43]:58081) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1er5SU-0000XE-45 for bug-gnu-emacs@gnu.org; Wed, 28 Feb 2018 12:24:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1er5ST-0003dE-Tj for bug-gnu-emacs@gnu.org; Wed, 28 Feb 2018 12:24:01 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Wed, 28 Feb 2018 17:24:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 30626 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 30626-submit@debbugs.gnu.org id=B30626.151983858213871 (code B ref 30626); Wed, 28 Feb 2018 17:24:01 +0000 Original-Received: (at 30626) by debbugs.gnu.org; 28 Feb 2018 17:23:02 +0000 Original-Received: from localhost ([127.0.0.1]:37745 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1er5RV-0003bb-BV for submit@debbugs.gnu.org; Wed, 28 Feb 2018 12:23:01 -0500 Original-Received: from eggs.gnu.org ([208.118.235.92]:34823) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1er5RT-0003bK-Fp for 30626@debbugs.gnu.org; Wed, 28 Feb 2018 12:22:59 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1er5RK-000087-8e for 30626@debbugs.gnu.org; Wed, 28 Feb 2018 12:22:54 -0500 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:33348) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1er5RK-00007y-52; Wed, 28 Feb 2018 12:22:50 -0500 Original-Received: from [176.228.60.248] (port=3566 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1er5RJ-0004Mq-Fm; Wed, 28 Feb 2018 12:22:49 -0500 In-reply-to: <87po4pnl0a.fsf@web.de> (message from Michael Heerdegen on Wed, 28 Feb 2018 17:20:53 +0100) 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:143746 Archived-At: > From: Michael Heerdegen > Cc: npostavs@gmail.com, 30626@debbugs.gnu.org > Date: Wed, 28 Feb 2018 17:20:53 +0100 > > Eli Zaretskii writes: > > > How do you see that the car is immediately thrown away? > > After expansion and dispatch, this is what gets executed: > > #+begin_src emacs-lisp > (let ((stream (stream-range 1 1000000))) > (while (not (stream-empty-p stream)) > (funcall #'ignore (stream-first stream)) > (setq stream (stream-rest stream)))) > #+end_src > > Creating an element and throwing away the outermost cons alternate. I don't think it's thrown away from the POV of GC. But you can easily see what is going on if you trace the GC on the C level. You should be able to see which object causes recursion in mark_object. I didn't look long enough, but what I did see looks very much like the entire unwound stream.