From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects Date: Wed, 27 May 2020 18:26:36 +0300 Message-ID: <83blm9tn4j.fsf@gnu.org> References: <83zha8cgpi.fsf@gnu.org> <83r1vibmyj.fsf@gnu.org> <83imgublku.fsf@gnu.org> <831rncjuwf.fsf@gnu.org> <83h7w5xvfa.fsf@gnu.org> <83y2phwb9x.fsf@gnu.org> <83r1v9w9vi.fsf@gnu.org> <83mu5xw50d.fsf@gnu.org> <83k110wxte.fsf@gnu.org> <4bab5f55-95fe-cf34-e490-1d4319728395@cs.ucla.edu> <837dwyvi74.fsf@gnu.org> <1484f569-c260-9fb0-bfe1-67897de289d3@cs.ucla.edu> Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="90794"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 41321@debbugs.gnu.org, monnier@iro.umontreal.ca, pipcet@gmail.com To: Paul Eggert Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Wed May 27 17:27:09 2020 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jdxxV-000NVo-FE for geb-bug-gnu-emacs@m.gmane-mx.org; Wed, 27 May 2020 17:27:09 +0200 Original-Received: from localhost ([::1]:47626 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jdxxU-000869-Ed for geb-bug-gnu-emacs@m.gmane-mx.org; Wed, 27 May 2020 11:27:08 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:49518) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jdxxO-00085p-Av for bug-gnu-emacs@gnu.org; Wed, 27 May 2020 11:27:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:38259) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jdxxO-0002jN-0u for bug-gnu-emacs@gnu.org; Wed, 27 May 2020 11:27:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1jdxxN-0003BE-Sf for bug-gnu-emacs@gnu.org; Wed, 27 May 2020 11:27:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Wed, 27 May 2020 15:27:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 41321 X-GNU-PR-Package: emacs Original-Received: via spool by 41321-submit@debbugs.gnu.org id=B41321.159059321712215 (code B ref 41321); Wed, 27 May 2020 15:27:01 +0000 Original-Received: (at 41321) by debbugs.gnu.org; 27 May 2020 15:26:57 +0000 Original-Received: from localhost ([127.0.0.1]:49805 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jdxxJ-0003Aw-Ab for submit@debbugs.gnu.org; Wed, 27 May 2020 11:26:57 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:42066) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jdxxH-0003Aj-2F for 41321@debbugs.gnu.org; Wed, 27 May 2020 11:26:55 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:38257) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jdxxB-0002e4-B5; Wed, 27 May 2020 11:26:49 -0400 Original-Received: from [176.228.60.248] (port=3293 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1jdxxA-00080D-1e; Wed, 27 May 2020 11:26:48 -0400 In-Reply-To: <1484f569-c260-9fb0-bfe1-67897de289d3@cs.ucla.edu> (message from Paul Eggert on Tue, 26 May 2020 15:49:24 -0700) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list 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-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:181091 Archived-At: > Cc: pipcet@gmail.com, 41321@debbugs.gnu.org, monnier@iro.umontreal.ca > From: Paul Eggert > Date: Tue, 26 May 2020 15:49:24 -0700 > > > On non-USE_LSB_TAG systems, GCALIGNMENT is 1, so this doesn't look > > right (or maybe I'm missing something). > > Good point; I'd neglected that. I.e., on !USE_LSB_TAG systems the proposed > emacs-27 patch is overly-conservative, as it causes maybe_lisp_pointer to always > return true. Although this hurts GC performance it doesn't affect correctness > and the patch does fix a crash on USE_LSB_TAG systems, so it (or something like > it) is needed for emacs-27. We used to rely on 8-byte alignment on those systems, and I don't see any reason not to continue relying on that and punishing those systems' performance. What would we gain?