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#40661: Crash in regex search during redisplay Date: Thu, 16 Apr 2020 19:33:16 +0300 Message-ID: <83d087e6gj.fsf@gnu.org> References: <83ftd3e92z.fsf@gnu.org> Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="70043"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 40661@debbugs.gnu.org To: rcopley@gmail.com Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Thu Apr 16 18:34:19 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 1jP7T1-000I6t-9H for geb-bug-gnu-emacs@m.gmane-mx.org; Thu, 16 Apr 2020 18:34:19 +0200 Original-Received: from localhost ([::1]:36914 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jP7T0-0006tB-BT for geb-bug-gnu-emacs@m.gmane-mx.org; Thu, 16 Apr 2020 12:34:18 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:58982) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jP7Sk-0006lK-Sm for bug-gnu-emacs@gnu.org; Thu, 16 Apr 2020 12:34:03 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jP7Sj-0006dR-UA for bug-gnu-emacs@gnu.org; Thu, 16 Apr 2020 12:34:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:55923) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1jP7Sj-0006dL-RT for bug-gnu-emacs@gnu.org; Thu, 16 Apr 2020 12:34:01 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1jP7Sj-0004c2-PG for bug-gnu-emacs@gnu.org; Thu, 16 Apr 2020 12:34:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 16 Apr 2020 16:34:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 40661 X-GNU-PR-Package: emacs Original-Received: via spool by 40661-submit@debbugs.gnu.org id=B40661.158705482617706 (code B ref 40661); Thu, 16 Apr 2020 16:34:01 +0000 Original-Received: (at 40661) by debbugs.gnu.org; 16 Apr 2020 16:33:46 +0000 Original-Received: from localhost ([127.0.0.1]:39236 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jP7SU-0004bW-IV for submit@debbugs.gnu.org; Thu, 16 Apr 2020 12:33:46 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:43748) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jP7SS-0004bH-Ac for 40661@debbugs.gnu.org; Thu, 16 Apr 2020 12:33:45 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:36193) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1jP7SM-0006OS-So; Thu, 16 Apr 2020 12:33:38 -0400 Original-Received: from [176.228.60.248] (port=2951 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1jP7SG-0004Fe-1E; Thu, 16 Apr 2020 12:33:35 -0400 In-Reply-To: <83ftd3e92z.fsf@gnu.org> (message from Eli Zaretskii on Thu, 16 Apr 2020 18:36:36 +0300) 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: 209.51.188.43 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-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:178458 Archived-At: > Date: Thu, 16 Apr 2020 18:36:36 +0300 > From: Eli Zaretskii > Cc: 40661@debbugs.gnu.org > > Looks like GC sometimes kicks in while we are inside re_search_2 Or not. I cannot get a breakpoint inside GC to fire while we are in search_buffer_re, so maybe my hypothesis was wrong. Although the symptoms are all there: when the segfault hits, the pointers passed to re_search_2 are invalid, but BEGV_ADDR and GAP_END_ADDR, from which they are supposed to be computed, are valid (and different). And the patch does seem to avoid the segfaults. But maybe it's just a coincidence or a side effect...