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#53136: 28.0.90; segfault in lock_file Date: Sun, 09 Jan 2022 14:56:54 +0200 Message-ID: <83wnj99ieh.fsf@gnu.org> References: <871r1hv40o.fsf.ref@yahoo.com> <871r1hv40o.fsf@yahoo.com> <83bl0l2we3.fsf@gnu.org> <87r19htjlp.fsf@yahoo.com> <838rvp2tcw.fsf@gnu.org> <875yqtt9qk.fsf@yahoo.com> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="30655"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 53136@debbugs.gnu.org To: Po Lu Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sun Jan 09 13:58:11 2022 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 1n6Xly-0007mc-3V for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 09 Jan 2022 13:58:10 +0100 Original-Received: from localhost ([::1]:42382 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1n6Xlx-0004xn-6A for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 09 Jan 2022 07:58:09 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:53132) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1n6Xlq-0004vU-HO for bug-gnu-emacs@gnu.org; Sun, 09 Jan 2022 07:58:02 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:56450) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1n6Xlq-0002s2-8e for bug-gnu-emacs@gnu.org; Sun, 09 Jan 2022 07:58:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1n6Xlq-0002UK-6n for bug-gnu-emacs@gnu.org; Sun, 09 Jan 2022 07:58:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 09 Jan 2022 12:58:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 53136 X-GNU-PR-Package: emacs Original-Received: via spool by 53136-submit@debbugs.gnu.org id=B53136.16417330379510 (code B ref 53136); Sun, 09 Jan 2022 12:58:02 +0000 Original-Received: (at 53136) by debbugs.gnu.org; 9 Jan 2022 12:57:17 +0000 Original-Received: from localhost ([127.0.0.1]:49353 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1n6Xl6-0002TK-N7 for submit@debbugs.gnu.org; Sun, 09 Jan 2022 07:57:16 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:52306) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1n6Xl2-0002T6-7u for 53136@debbugs.gnu.org; Sun, 09 Jan 2022 07:57:15 -0500 Original-Received: from [2001:470:142:3::e] (port=53876 helo=fencepost.gnu.org) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1n6Xkw-0002oW-UQ; Sun, 09 Jan 2022 07:57:06 -0500 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=UFpzP3K3pUlPLBXwahvBwM9UrHyGwh/5Ze2fPS3jPAM=; b=cZrSdhcWkWGv WM7zni1+aDD91Ty51TINMn5M+WMuKnrMRCa9nZ1cYdHYoydwLhTBxUGNDuSTM6uBadCSMl9PDX6tW Ns8BbSVio5ZPcEI8YpYXoUvkITN+cGLYVqmPuXcs0h4VXx8h1v/EDSrDhBXPZ+z1d+vL809yvILyJ 6koC7RPwpq65E30qbLPKPGTD1NY3riLKlA16jn7ul3NLiqYaZhmaUCatjINUpFBXYqcgFMJOHzUa1 PHLoC/kuC0MLhGXn3qKAs+bsXqMwZj4k7AI3wEO3hS71gVdmPxHjNxPUECvtcKsKUMWyjC0m1ifTQ 0ZZGmVHFtDl741NDIckcNQ==; Original-Received: from [87.69.77.57] (port=4523 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 1n6Xkw-0006a3-VA; Sun, 09 Jan 2022 07:57:07 -0500 In-Reply-To: <875yqtt9qk.fsf@yahoo.com> (message from Po Lu on Sun, 09 Jan 2022 19:43:47 +0800) 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:223844 Archived-At: > From: Po Lu > Cc: 53136@debbugs.gnu.org > Date: Sun, 09 Jan 2022 19:43:47 +0800 > > Eli Zaretskii writes: > > > So we somehow wrote more than 8192 bytes by that memcpy line? I find > > this hard to believe. > > Manual inspection of the core dump seems to reveal something very > different from what the debugger said (and I asked for a second opinion > on this as well): > > - lock_info.dot and lock_info.colon are NULL. > - lock_filename is a Lisp string, the data is > "/home/oldosfan/Mail/archive/sent/2022-01". > - handler, subject_buf are NULL > - dot is NULL > - pidlen is -1 (long int) > - replacementlen is 6 On second thought, these values are strange. Is PC really at the memcpy line? I don't see how dot could be NULL at that point: if lock_if_free returns a negative value, lock_info.dot cannot be NULL, according to my reading of the code. What is the contents of lock_info.user upto the first null byte?