From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.bugs Subject: bug#33345: 27.0.50; Abort in bidi_cache_iterator_state Date: Tue, 13 Nov 2018 13:28:23 -0500 Message-ID: References: <83in13a9fi.fsf@gnu.org> <8336s69t32.fsf@gnu.org> <83tvkm89sw.fsf@gnu.org> <83in1097kh.fsf@gnu.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1542134429 24314 195.159.176.226 (13 Nov 2018 18:40:29 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 13 Nov 2018 18:40:29 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) Cc: 33345@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Tue Nov 13 19:40:24 2018 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gMdbp-00069F-VB for geb-bug-gnu-emacs@m.gmane.org; Tue, 13 Nov 2018 19:40:22 +0100 Original-Received: from localhost ([::1]:55665 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gMddw-0005Di-BD for geb-bug-gnu-emacs@m.gmane.org; Tue, 13 Nov 2018 13:42:32 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:36938) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gMddd-00051S-VD for bug-gnu-emacs@gnu.org; Tue, 13 Nov 2018 13:42:17 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gMdQs-00047G-KG for bug-gnu-emacs@gnu.org; Tue, 13 Nov 2018 13:29:06 -0500 Original-Received: from debbugs.gnu.org ([208.118.235.43]:46341) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1gMdQs-000478-En for bug-gnu-emacs@gnu.org; Tue, 13 Nov 2018 13:29:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1gMdQs-00069Q-91 for bug-gnu-emacs@gnu.org; Tue, 13 Nov 2018 13:29:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Stefan Monnier Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Tue, 13 Nov 2018 18:29:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 33345 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 33345-submit@debbugs.gnu.org id=B33345.154213370723595 (code B ref 33345); Tue, 13 Nov 2018 18:29:02 +0000 Original-Received: (at 33345) by debbugs.gnu.org; 13 Nov 2018 18:28:27 +0000 Original-Received: from localhost ([127.0.0.1]:50599 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gMdQJ-00068T-FM for submit@debbugs.gnu.org; Tue, 13 Nov 2018 13:28:27 -0500 Original-Received: from chene.dit.umontreal.ca ([132.204.246.20]:57852) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gMdQI-00068L-8n for 33345@debbugs.gnu.org; Tue, 13 Nov 2018 13:28:26 -0500 Original-Received: from pastel.home (lechon.iro.umontreal.ca [132.204.27.242]) by chene.dit.umontreal.ca (8.14.7/8.14.1) with ESMTP id wADISO1F016024; Tue, 13 Nov 2018 13:28:24 -0500 Original-Received: by pastel.home (Postfix, from userid 20848) id E0DB26513D; Tue, 13 Nov 2018 13:28:23 -0500 (EST) In-Reply-To: <83in1097kh.fsf@gnu.org> (Eli Zaretskii's message of "Tue, 13 Nov 2018 20:05:34 +0200") X-NAI-Spam-Flag: NO X-NAI-Spam-Threshold: 5 X-NAI-Spam-Score: 0 X-NAI-Spam-Rules: 2 Rules triggered EDT_SA_DN_PASS=0, RV6417=0 X-NAI-Spam-Version: 2.3.0.9418 : core <6417> : inlines <6959> : streams <1804169> : uri <2749075> 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: 208.118.235.43 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.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:152353 Archived-At: > But this means that the cache is empty, and we can never scan back > (scan_dir = -1) when the cache is empty. So something very strange > happened there. I think it's a case of memory corruption and doesn't really have much to do with bidi code. But I'm not progressing very fast: it's somewhat deterministic but it is influenced by elements I'm not aware of, so it's pretty nasty. > Instead of me asking you gobs of questions, perhaps you could give me > an ssh login on that system, and arrange for a GDB session which > already hit the call to emacs_abort to be in a state where I can > switch to it after logging in (with 'screen' or 'tmux', I think). > Then I could look around and see if I find out some clues. It's a machine that's not reachable from the internet and is off most of the time. I haven't yet managed to reproduce it on another machine. I'll let you know when I'm making progress, Thanks, Stefan