From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: GC and stack marking Date: Tue, 20 May 2014 22:28:48 +0300 Message-ID: <83wqdgntan.fsf@gnu.org> References: <83a9add91p.fsf@gnu.org> <8338g4bd7m.fsf@gnu.org> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1400614149 22345 80.91.229.3 (20 May 2014 19:29:09 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 20 May 2014 19:29:09 +0000 (UTC) Cc: fabrice.popineau@gmail.com, emacs-devel@gnu.org To: Stefan Monnier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Tue May 20 21:29:00 2014 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Wmpia-0006SV-Rz for ged-emacs-devel@m.gmane.org; Tue, 20 May 2014 21:28:56 +0200 Original-Received: from localhost ([::1]:55112 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Wmpia-0002AU-D2 for ged-emacs-devel@m.gmane.org; Tue, 20 May 2014 15:28:56 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:59939) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WmpiR-0002AE-PR for emacs-devel@gnu.org; Tue, 20 May 2014 15:28:52 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WmpiM-0005SH-Lf for emacs-devel@gnu.org; Tue, 20 May 2014 15:28:47 -0400 Original-Received: from mtaout21.012.net.il ([80.179.55.169]:33054) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WmpiM-0005Ry-Dm for emacs-devel@gnu.org; Tue, 20 May 2014 15:28:42 -0400 Original-Received: from conversion-daemon.a-mtaout21.012.net.il by a-mtaout21.012.net.il (HyperSendmail v2007.08) id <0N5W00A000B46V00@a-mtaout21.012.net.il> for emacs-devel@gnu.org; Tue, 20 May 2014 22:28:40 +0300 (IDT) Original-Received: from HOME-C4E4A596F7 ([87.69.4.28]) by a-mtaout21.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0N5W00AV00RS0M50@a-mtaout21.012.net.il>; Tue, 20 May 2014 22:28:40 +0300 (IDT) In-reply-to: X-012-Sender: halo1@inter.net.il X-detected-operating-system: by eggs.gnu.org: Solaris 10 X-Received-From: 80.179.55.169 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:171966 Archived-At: > From: Stefan Monnier > Cc: emacs-devel@gnu.org, fabrice.popineau@gmail.com > Date: Tue, 20 May 2014 13:54:16 -0400 > > >> But it shouldn't cause any trouble (other than extra memory use). > > It does, due to all kinds of subtleties. The result is that the > > large_vectors linked list gets dumped with a pointer to a non-existent > > memory, and the dumped Emacs then crashes on the first GC when it > > tries to traverse that linked list. > > We should fix that. No argument here. Otherwise the dumped Emacs crashes. > > I think this is hopeless: I see this problem on a single system; two > > others don't have it. It's just some semi-random garbage somehwre on > > the stack. > > Of course, but if you can find where it comes from, we can fix that > one case. I tried, but couldn't. Suggestions for how to set up a GDB session for that are welcome.