From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Noam Postavsky Newsgroups: gmane.emacs.bugs Subject: bug#35273: "Marker does not point anywhere" when reading next article Date: Tue, 16 Apr 2019 09:13:10 -0400 Message-ID: <87wojuxfdl.fsf@gmail.com> References: <875zrgpusw.fsf@vuxu.org> <87lg0czgy1.fsf@tcd.ie> <8736mkgu83.fsf@vuxu.org> <87zhoqxgzn.fsf@gmail.com> <87wojum7vc.fsf@vuxu.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="44889"; mail-complaints-to="usenet@blaine.gmane.org" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.2 (gnu/linux) Cc: "Basil L. Contovounesios" , 35273@debbugs.gnu.org To: Leah Neukirchen Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Tue Apr 16 15:14:24 2019 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1hGNuo-000BX3-Rx for geb-bug-gnu-emacs@m.gmane.org; Tue, 16 Apr 2019 15:14:22 +0200 Original-Received: from localhost ([127.0.0.1]:36561 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hGNun-0001B0-LK for geb-bug-gnu-emacs@m.gmane.org; Tue, 16 Apr 2019 09:14:21 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:39206) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hGNua-00018w-CS for bug-gnu-emacs@gnu.org; Tue, 16 Apr 2019 09:14:09 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hGNuX-00065i-Hr for bug-gnu-emacs@gnu.org; Tue, 16 Apr 2019 09:14:07 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:51501) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1hGNuU-000630-8M for bug-gnu-emacs@gnu.org; Tue, 16 Apr 2019 09:14:03 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1hGNuT-0005dm-TY; Tue, 16 Apr 2019 09:14:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Noam Postavsky Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org, bugs@gnus.org Resent-Date: Tue, 16 Apr 2019 13:14:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 35273 X-GNU-PR-Package: emacs,gnus Original-Received: via spool by 35273-submit@debbugs.gnu.org id=B35273.155542040021606 (code B ref 35273); Tue, 16 Apr 2019 13:14:01 +0000 Original-Received: (at 35273) by debbugs.gnu.org; 16 Apr 2019 13:13:20 +0000 Original-Received: from localhost ([127.0.0.1]:36809 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1hGNto-0005cP-HY for submit@debbugs.gnu.org; Tue, 16 Apr 2019 09:13:20 -0400 Original-Received: from mail-qk1-f182.google.com ([209.85.222.182]:46051) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1hGNtm-0005cD-7I for 35273@debbugs.gnu.org; Tue, 16 Apr 2019 09:13:19 -0400 Original-Received: by mail-qk1-f182.google.com with SMTP id z76so12030563qkb.12 for <35273@debbugs.gnu.org>; Tue, 16 Apr 2019 06:13:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:references:date:in-reply-to:message-id :user-agent:mime-version; bh=yc0LnyQFd2IiAP4jnWM8YFY7DxQ400jcsZUiArNRe4c=; b=PGpGMmUlQC2AmhHxEm7fpr0vmiiYbABUbYQMgjpTvKVhaA+zuaEwzKM1xH92PAJgn7 2t+e5bfP6rUCm9ONDFoAg8WNero8zM9gToWTKQaEyahYkUUMyFCNjsz1VdZRsAJCssnm OwxPQoySHUPHoLDxyF3R4+6VB5+c1IRp12+7P8UHy8Ul+vHbUspejKLdm6Dm4yFlueQH 5sKQwRA4OufUm9i4m48FxcVSnQcGXp4a3rfoe12ZNJ4tpLh1QitRFSsq5oPoDV6trPEf DcxqxenmN2isvWcy0gy9M8cU52wmHqq435ju5u6ESr9Ib9mXSQTVrPBKWgirEEIg9Zrr z4YA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:references:date:in-reply-to :message-id:user-agent:mime-version; bh=yc0LnyQFd2IiAP4jnWM8YFY7DxQ400jcsZUiArNRe4c=; b=kMedbP35udmNx/ViTrpSwcfNUVT0KyBv+EPNZcwv5nRdPmTBBRgdZ/BugB3kPeH/H9 Hf14i5NvRjij/c86lpwlHfC/GDZwuUEe4UfXoHsXOqzIFBBKBnGgt5CH4bMoBJRB+Ewp LJGC2X9M1u39j7PIYtOn5Ybbiq2jP7g1cJxCDbVIsowiM23Q2zusJcg3gPpN87Qnl7Ml 167Ly3lrSkJA3mBdPBmEKUgeQ5Pz8bZP1nEGIDzUVO13bagtaiwsroKCScaXXs4Qf0Vb huuMQdc7sBPC8CePghDUV3yDtZ9khpeAULEgiwwNvwH/nYS8hoSaH3kRtCU3JwhLSCXp MdCA== X-Gm-Message-State: APjAAAXPEiuRE72stHxGwoUzdTOZGPqUXHyaxJbtio5R/wUVrGy1F8nk a0oBz60F9ctrmR5n5vQb4KXIBU4y X-Google-Smtp-Source: APXvYqxjFIz6PINbk8JKt4Bzkfft1Lo5wvcgnXB6Dd+ZNn7X34/vaJN+UKgt8+S5vxuwJvAjgL56dA== X-Received: by 2002:a37:7383:: with SMTP id o125mr63545686qkc.56.1555420392550; Tue, 16 Apr 2019 06:13:12 -0700 (PDT) Original-Received: from minid (cbl-45-2-119-34.yyz.frontiernetworks.ca. [45.2.119.34]) by smtp.googlemail.com with ESMTPSA id f47sm40761822qta.80.2019.04.16.06.13.11 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 16 Apr 2019 06:13:11 -0700 (PDT) In-Reply-To: <87wojum7vc.fsf@vuxu.org> (Leah Neukirchen's message of "Tue, 16 Apr 2019 14:50:47 +0200") 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: 209.51.188.43 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:157711 Archived-At: Leah Neukirchen writes: >> If you can reproduce it reliably, setting (setq debug-on-signal t) just >> before might help get a backtrace. >> >> If that also doesn't work you could record the backtrace from a >> signal-hook-function: >> >> (defvar bug-35273-last-backtrace nil) >> (defun bug-35273-record-backtrace (err data)[...] >> (setq signal-hook-function #'bug-35273-record-backtrace) > > These do not work for some reason... debug-on-signal doesn't work because the debugger is suppressed during redisplay (to avoid recursion). I think the signal-hook-function might have worked (though I forgot to tell you to check the value of bug-35273-last-backtrace afterwards) but it would only have a single frame of "redisplay" so it would be useless. >> Or if you can run under gdb, just set a breakpoint in the C code where >> that error is raised. > > On 27.0.50 (05d53d888): > > Breakpoint 1, marker_position (marker=0x555557d6feb5) at marker.c:680 > 680 error ("Marker does not point anywhere"); > (gdb) bt > #0 marker_position (marker=0x555557d6feb5) at marker.c:680 > #1 0x000055555567935e in mouse_face_overlay_overlaps (overlay=0x555557d6ff15) > at lisp.h:2624 > #2 0x00005555555d395f in note_mouse_highlight (f=f@entry=0x555556001d70, > x=, y=) at xdisp.c:31836 The xdisp.c:31836 at revision 05d53d888 has help_echo_pos = charpos; And neither note_mouse_highlight nor mouse_face_overlay_overlaps call marker_position, so I'm confused how we got there. note_mouse_highlight does call Fmarker_position, but that one doesn't signal an error. Maybe the debug info is messed up by optimization. Could you try recompiling with CFLAGS='-O0 -g3'?