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#44313: 27.1.50; ns_mouse_position EXC_BAD_ACCESS crash Date: Fri, 30 Oct 2020 20:47:31 +0200 Message-ID: <83imara6v0.fsf@gnu.org> References: <83o8kkb2vr.fsf@gnu.org> <83a6w4ar50.fsf@gnu.org> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="1905"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 44313@debbugs.gnu.org To: Aaron Jensen Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Fri Oct 30 19:48:11 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 1kYZRb-0000N3-HM for geb-bug-gnu-emacs@m.gmane-mx.org; Fri, 30 Oct 2020 19:48:11 +0100 Original-Received: from localhost ([::1]:50930 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kYZRa-0007nh-CX for geb-bug-gnu-emacs@m.gmane-mx.org; Fri, 30 Oct 2020 14:48:10 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:52874) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kYZRS-0007na-Fo for bug-gnu-emacs@gnu.org; Fri, 30 Oct 2020 14:48:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:48186) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kYZRS-0001iw-6d for bug-gnu-emacs@gnu.org; Fri, 30 Oct 2020 14:48:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1kYZRS-0004E8-5Z for bug-gnu-emacs@gnu.org; Fri, 30 Oct 2020 14:48:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Fri, 30 Oct 2020 18:48:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 44313 X-GNU-PR-Package: emacs Original-Received: via spool by 44313-submit@debbugs.gnu.org id=B44313.160408367616236 (code B ref 44313); Fri, 30 Oct 2020 18:48:02 +0000 Original-Received: (at 44313) by debbugs.gnu.org; 30 Oct 2020 18:47:56 +0000 Original-Received: from localhost ([127.0.0.1]:59732 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1kYZRM-0004Dn-8P for submit@debbugs.gnu.org; Fri, 30 Oct 2020 14:47:56 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:52754) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1kYZRK-0004Da-NK for 44313@debbugs.gnu.org; Fri, 30 Oct 2020 14:47:54 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:50223) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kYZRF-0001hF-EQ; Fri, 30 Oct 2020 14:47:49 -0400 Original-Received: from [176.228.60.248] (port=1487 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1kYZRE-0003mN-R1; Fri, 30 Oct 2020 14:47:49 -0400 In-Reply-To: (message from Aaron Jensen on Fri, 30 Oct 2020 10:54:56 -0500) 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:192176 Archived-At: > From: Aaron Jensen > Date: Fri, 30 Oct 2020 10:54:56 -0500 > Cc: 44313@debbugs.gnu.org > > On Fri, Oct 30, 2020 at 6:29 AM Eli Zaretskii wrote: > > If f is non-NULL, I don't think it could case EXC_BAD_ACCESS, unless f > > is garbled and points outside of the process's address space. Which > > is why we need to see the value of f and whether the address it points > > to could be accessed. > > Looks like it's non-NULL and it can't be accessed. > > (lldb) p f > (frame *) $12 = 0x00000009040f6c5d > (lldb) p *f > error: Couldn't apply expression side effects : Couldn't dematerialize > a result variable: couldn't read its memory > (lldb) p (f)->output_method > error: supposed to interpret, but failed: Interpreter couldn't read from memory That doesn't sound like a frame that is not live, that sounds like a frame whose memory was freed. Or a frame pointer that is just garbage. So the question now is: where did that frame pointer come from?