From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#63711: 30.0.50; Crash in xdisp.c when it->string is 0x0 Date: Thu, 25 May 2023 10:34:02 +0300 Message-ID: <83ilcgn9ud.fsf@gnu.org> References: Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="39396"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 63711@debbugs.gnu.org To: Thomas Fitzsimmons Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Thu May 25 09:34:29 2023 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 1q25UT-000A1J-Af for geb-bug-gnu-emacs@m.gmane-mx.org; Thu, 25 May 2023 09:34:29 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1q25UD-0003f9-MF; Thu, 25 May 2023 03:34:13 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1q25U2-0003ea-Qx for bug-gnu-emacs@gnu.org; Thu, 25 May 2023 03:34:03 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1q25U2-0001IK-Iu for bug-gnu-emacs@gnu.org; Thu, 25 May 2023 03:34:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1q25U2-0007s6-De for bug-gnu-emacs@gnu.org; Thu, 25 May 2023 03:34:02 -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, 25 May 2023 07:34:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 63711 X-GNU-PR-Package: emacs Original-Received: via spool by 63711-submit@debbugs.gnu.org id=B63711.168500002330225 (code B ref 63711); Thu, 25 May 2023 07:34:02 +0000 Original-Received: (at 63711) by debbugs.gnu.org; 25 May 2023 07:33:43 +0000 Original-Received: from localhost ([127.0.0.1]:45852 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1q25Ti-0007rR-R3 for submit@debbugs.gnu.org; Thu, 25 May 2023 03:33:43 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:46310) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1q25Tg-0007rE-Ob for 63711@debbugs.gnu.org; Thu, 25 May 2023 03:33:41 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1q25Tb-0001GZ-34; Thu, 25 May 2023 03:33:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=References:Subject:In-Reply-To:To:From:Date: mime-version; bh=2tl1OKENAz9bRjpuebULegrNgWoDkYWeaC8GcCMSSlE=; b=L67rAZpii0nf qv0r4abddh55oXLIc+7knImbViMog5rVdw8ntLruNmnCHwZ436DEOvpXyeH4B3qPRc8xSdUJePbKC tLCPTDBCVMGEEbZ5jdqredAM7Nt6PxGgGQGJbi/NSFXqErlkqLq4lbGriGqx+eLlhbMzXn79z5/fI KSzK0AOwTVwgmU19ZfMq5SFF+9KBMx7F5Y8XUleBJeh9AiHVWEIBzuRqWwU16gqYkJZRR/DnunStv nCzDVWBJtMSV8d7Cr4w2KYFhJwkA7z7IrN+Om5aUkKR6CE4hGkM5zRzej4xc+h4jTiu5ShP5tucSm QHgDVLVa1vFmkyxf8xsQmQ==; Original-Received: from [87.69.77.57] (helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1q25Ta-0007sB-2Y; Thu, 25 May 2023 03:33:34 -0400 In-Reply-To: (message from Thomas Fitzsimmons on Thu, 25 May 2023 02:27:19 -0400) 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-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.bugs:262348 Archived-At: > From: Thomas Fitzsimmons > Date: Thu, 25 May 2023 02:27:19 -0400 > > I have been having long-running Emacs sessions crash, rarely, and I > finally caught one case in GDB. Full backtraces attached. I don't know > how it->string becomes 0x0, but it looks like SCHARS (it->string) then > attempts to dereference the null pointer. I'll keep the session running > in case there is anything else someone wants me to check. Thanks, but with an optimized build and without a recipe to reproduce this, it will be hard to debug this. Still, I ask you below to produce some values from GDB in the hope that this would give some ideas. (gdb) p pos->overlay_string_index (gdb) p it->current.overlay_string_index (gdb) p it->sp (gdb) p it->method (gdb) p it->string (gdb) xtype If GDB says that the last command "xtype" is not known, type: (gdb) source /path/to/emacs/src/.gdbinit (gdb) p it->string (gdb) xtype