From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Leah Neukirchen Newsgroups: gmane.emacs.bugs Subject: bug#35273: "Marker does not point anywhere" when reading next article Date: Tue, 16 Apr 2019 14:50:47 +0200 Message-ID: <87wojum7vc.fsf@vuxu.org> References: <875zrgpusw.fsf@vuxu.org> <87lg0czgy1.fsf@tcd.ie> <8736mkgu83.fsf@vuxu.org> <87zhoqxgzn.fsf@gmail.com> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="195555"; 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: Noam Postavsky Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Tue Apr 16 14:51:25 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 1hGNYX-000oeA-T9 for geb-bug-gnu-emacs@m.gmane.org; Tue, 16 Apr 2019 14:51:22 +0200 Original-Received: from localhost ([127.0.0.1]:36161 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hGNYW-0002Rr-UA for geb-bug-gnu-emacs@m.gmane.org; Tue, 16 Apr 2019 08:51:20 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:60923) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hGNYK-0002QX-61 for bug-gnu-emacs@gnu.org; Tue, 16 Apr 2019 08:51:09 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hGNYI-0004Wg-T3 for bug-gnu-emacs@gnu.org; Tue, 16 Apr 2019 08:51:08 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:51477) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1hGNYF-0004Su-1T for bug-gnu-emacs@gnu.org; Tue, 16 Apr 2019 08:51:06 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1hGNYE-000562-SC; Tue, 16 Apr 2019 08:51:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Leah Neukirchen Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org, bugs@gnus.org Resent-Date: Tue, 16 Apr 2019 12:51:02 +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=B35273.155541905919574 (code B ref 35273); Tue, 16 Apr 2019 12:51:02 +0000 Original-Received: (at 35273) by debbugs.gnu.org; 16 Apr 2019 12:50:59 +0000 Original-Received: from localhost ([127.0.0.1]:36786 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1hGNYB-00055e-7H for submit@debbugs.gnu.org; Tue, 16 Apr 2019 08:50:59 -0400 Original-Received: from mail-wr1-f47.google.com ([209.85.221.47]:42248) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1hGNY9-00055C-C9 for 35273@debbugs.gnu.org; Tue, 16 Apr 2019 08:50:58 -0400 Original-Received: by mail-wr1-f47.google.com with SMTP id g3so26878465wrx.9 for <35273@debbugs.gnu.org>; Tue, 16 Apr 2019 05:50:57 -0700 (PDT) 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=//h0ISPSKEDALMwfc6SwOxVmfbRsRQuSNQB2cYthOKc=; b=OCnvvLYjIplPM0QZaMmHmsSJ7cEX/FD271qZfOQOTMXvm/Le02/k7TSLml0ZY76pI5 0wSGXmHRicxUvq8dVNlYFtgoVYzZZES7cNERfovn0naqTFnkYtot/dhYa7XWihBku2k4 TDVSr8uANqPEERaSU8Zr/VuQjrFk4o2nY2O4R7APJFLVNc2Yyo1voo1D8BfEes9kNDmN jsxxLQWMciY9nS/zWUYE3DA7WJtVet0RvvQaRmd6WLjwZjEVxSRqio1stG4zyNPSy6kW MIruzM8TtU4BwYl3B/6c1YnuIMKACnrZMl7VCWkD9GPohiwovGSZ1b11o/vBT5nKUNa+ XvyQ== X-Gm-Message-State: APjAAAWBAiBch2CiREyDMLQzErjUBE79meiSLlykP0rxmKHFvdC5CKXK rAE5WiAy7MTnWebUFLu4wQw= X-Google-Smtp-Source: APXvYqzMnJyCiCbJdIkK0SIjmHc7s3gIGaJLnbcQp+ZgzMn4g2lMUVvTU+PzOq32VypI/4SDaUxMeA== X-Received: by 2002:adf:ea43:: with SMTP id j3mr28200064wrn.210.1555419051112; Tue, 16 Apr 2019 05:50:51 -0700 (PDT) Original-Received: from rhea.home.vuxu.org (host-212-114-138-244.customer.m-online.net. [212.114.138.244]) by smtp.gmail.com with ESMTPSA id q24sm16097696wmj.26.2019.04.16.05.50.50 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 16 Apr 2019 05:50:50 -0700 (PDT) Original-Received: from localhost (rhea.home.vuxu.org [local]) by rhea.home.vuxu.org (OpenSMTPD) with ESMTPA id 8dff7b41; Tue, 16 Apr 2019 12:50:47 +0000 (UTC) In-Reply-To: <87zhoqxgzn.fsf@gmail.com> (Noam Postavsky's message of "Tue, 16 Apr 2019 08:38:20 -0400") 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:157709 Archived-At: Noam Postavsky writes: > Leah Neukirchen writes: > >> If you have other ideas how I can debug it myself, please tell me. > > 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) > (when (and (eq err 'error) > (equal data '("Marker does not point anywhere"))) > (setq bug-35273-last-backtrace > (backtrace-frames 'signal))) > (let ((signal-hook-function nil)) > (signal err data))) > (setq signal-hook-function #'bug-35273-record-backtrace) These do not work for some reason... > 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 #3 0x0000555555633ee8 in XTframe_up_to_date (f=0x555556001d70) at xterm.c:1280 #4 0x00005555555c67de in redisplay_internal () at xdisp.c:14523 #5 0x00005555555c7dd5 in redisplay_preserve_echo_area ( from_where=from_where@entry=5) at xdisp.c:14759 #6 0x0000555555661902 in read_char (commandflag=commandflag@entry=1, map=map@entry=0x555557807873, prev_event=0x0, used_mouse_menu=used_mouse_menu@entry=0x7fffffffe05b, end_time=end_time@entry=0x0) at keyboard.c:2474 #7 0x00005555556642a1 in read_key_sequence ( keybuf=keybuf@entry=0x7fffffffe170, prompt=prompt@entry=0x0, dont_downcase_last=dont_downcase_last@entry=false, can_return_switch_frame=can_return_switch_frame@entry=true, fix_current_buffer=fix_current_buffer@entry=true, prevent_redisplay=prevent_redisplay@entry=false) at keyboard.c:9111 #8 0x0000555555665abc in command_loop_1 () at lisp.h:1064 #9 0x00005555556d4b6e in internal_condition_case ( bfun=bfun@entry=0x5555556658d0 , handlers=handlers@entry=0x5010, hfun=hfun@entry=0x55555565ce40 ) at eval.c:1352 #10 0x0000555555657b14 in command_loop_2 (ignore=ignore@entry=0x0) at lisp.h:1064 #11 0x00005555556d4add in internal_catch (tag=tag@entry=0xc5d0, func=func@entry=0x555555657af0 , arg=arg@entry=0x0) at eval.c:1115 #12 0x0000555555657aab in command_loop () at lisp.h:1064 #13 0x000055555565ca36 in recursive_edit_1 () at keyboard.c:714 #14 0x000055555565cd69 in Frecursive_edit () at keyboard.c:786 #15 0x000055555558890e in main (argc=1, argv=0x7fffffffe538) at emacs.c:1963 (gdb) xbacktrace "redisplay_internal (C function)" (0x0) (gdb) p buf $2 = (struct buffer *) 0x0 (gdb) p *m $4 = { header = { size = 4611686018477740032 }, buffer = 0x0, need_adjustment = false, insertion_type = true, next = 0x555557d6fe80, charpos = 1, bytepos = 1 } hth, -- Leah Neukirchen http://leah.zone