From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Andreas Politz Newsgroups: gmane.emacs.bugs Subject: bug#15475: 24.3.50; race condition in x_frame_rehighlight Date: Sat, 28 Sep 2013 01:47:33 +0200 Message-ID: <874n95n7xm.fsf@hochschule-trier.de> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="=-=-=" X-Trace: ger.gmane.org 1380325762 22033 80.91.229.3 (27 Sep 2013 23:49:22 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 27 Sep 2013 23:49:22 +0000 (UTC) To: 15475@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sat Sep 28 01:49:25 2013 Return-path: Envelope-to: geb-bug-gnu-emacs@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 1VPhmk-0000NL-7O for geb-bug-gnu-emacs@m.gmane.org; Sat, 28 Sep 2013 01:49:22 +0200 Original-Received: from localhost ([::1]:38987 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VPhmj-0002Sm-7I for geb-bug-gnu-emacs@m.gmane.org; Fri, 27 Sep 2013 19:49:21 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:55948) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VPhmY-0002Rb-A6 for bug-gnu-emacs@gnu.org; Fri, 27 Sep 2013 19:49:17 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VPhmR-0004eR-2S for bug-gnu-emacs@gnu.org; Fri, 27 Sep 2013 19:49:10 -0400 Original-Received: from debbugs.gnu.org ([140.186.70.43]:33316) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VPhmQ-0004eN-VM for bug-gnu-emacs@gnu.org; Fri, 27 Sep 2013 19:49:03 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.80) (envelope-from ) id 1VPhmQ-0007j3-Lb for bug-gnu-emacs@gnu.org; Fri, 27 Sep 2013 19:49:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Andreas Politz Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Fri, 27 Sep 2013 23:49:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: report 15475 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: X-Debbugs-Original-To: bug-gnu-emacs@gnu.org Original-Received: via spool by submit@debbugs.gnu.org id=B.138032571629662 (code B ref -1); Fri, 27 Sep 2013 23:49:02 +0000 Original-Received: (at submit) by debbugs.gnu.org; 27 Sep 2013 23:48:36 +0000 Original-Received: from localhost ([127.0.0.1]:41609 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1VPhlz-0007iL-EO for submit@debbugs.gnu.org; Fri, 27 Sep 2013 19:48:36 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:54134) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1VPhlv-0007i6-Br for submit@debbugs.gnu.org; Fri, 27 Sep 2013 19:48:32 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VPhln-0004Py-TL for submit@debbugs.gnu.org; Fri, 27 Sep 2013 19:48:31 -0400 Original-Received: from lists.gnu.org ([2001:4830:134:3::11]:34005) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VPhln-0004Pt-PL for submit@debbugs.gnu.org; Fri, 27 Sep 2013 19:48:23 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:55799) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VPhlh-0002Fk-HJ for bug-gnu-emacs@gnu.org; Fri, 27 Sep 2013 19:48:23 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VPhla-0004IV-Ph for bug-gnu-emacs@gnu.org; Fri, 27 Sep 2013 19:48:17 -0400 Original-Received: from gateway-a.fh-trier.de ([143.93.54.181]:58729) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VPhla-0004BU-Be for bug-gnu-emacs@gnu.org; Fri, 27 Sep 2013 19:48:10 -0400 X-Virus-Scanned: by Amavisd-new + McAfee uvscan + ClamAV [Rechenzentrum Hochschule Trier] Original-Received: from luca (dslb-178-012-089-208.pools.arcor-ip.net [178.12.89.208]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: politza) by gateway-a.fh-trier.de (Postfix) with ESMTPSA id 16A2B1760600 for ; Sat, 28 Sep 2013 01:47:34 +0200 (CEST) Original-Received: from politza by luca with local (Exim 4.72) (envelope-from ) id 1VPhkz-0008WE-BG for bug-gnu-emacs@gnu.org; Sat, 28 Sep 2013 01:47:33 +0200 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 140.186.70.43 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-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:78768 Archived-At: --=-=-= Content-Type: text/plain There is a race condition in x_frame_rehighlight regarding input redirection, triggering a null-pointer access. This kinds of errors are usually difficult to reproduce. I used the following code, while simultaneously changing focus rapidly via the window-manager. (defun fn (&optional parms) (let* ((frame (make-frame parms))) (sit-for 1e-100) (redirect-frame-focus (selected-frame) frame) frame)) (while t (let ((f1 (fn '((width . 20) (height . 30)))) (f2 (fn '((width . 20) (height . 30) (top . 400))))) (sleep-for (/ (float (random 1000)) 5000)) (delete-other-frames))) Take a look at this part of the attached back-trace. #0 0x00000000004f9b0e in frame_highlight (f=0x132b510) at xterm.c:3204 #4 0x00000000004fa4ae in x_detect_focus_change (dpyinfo=0x15ba800, frame=0x11c7e68, event=0x7fffffffb300, bufp=0x7fffffffae50) at xterm.c:3522 #14 0x00000000004ff413 in XTread_socket (...) at xterm.c:7066 #19 0x00000000005409e7 in unblock_input () at keyboard.c:7116 #20 0x0000000000503f82 in x_free_frame_resources (f=0x132b510) at xterm.c:9383 #21 0x0000000000503fbf in x_destroy_window (f=0x132b510) at xterm.c:9397 #22 0x00000000004274b7 in delete_frame (frame=20100373, force=12634498) at frame.c:1362 #23 0x000000000042784e in Fdelete_frame (frame=20100373, force=12634498) at frame.c:1495 Note that the freed frame in #20 is the same as the one about to be highlighted in #0. delete_frame would later execute f->terminal = 0; /* Now the frame is dead. */ but won't, since x_destroy_window has not returned yet. But x_free_frame_resources has executed f->output_data.x = NULL; , so FRAME_LIVE_P(f) is still true, but FRAME_X_DISPLAY is no good at this moment. Then in x_frame_rehighlight the deleted frame becomes the x_highlight_frame. (gdb) p /x dpyinfo->x_focus_frame $30 = 0x11c7e68 (gdb) p /x dpyinfo->x_highlight_frame $27 = 0x132b510 (gdb) pp dpyinfo->x_focus_frame.focus_frame # (gdb) p /x dpyinfo->x_highlight_frame.output_data.x $36 = 0x0 (gdb) p /x dpyinfo->x_highlight_frame.terminal $37 = 0x110e398 The second if condition is false (FRAME_LIVE_P) and frame_highlight gets called with the halfway deleted frame, calls FRAME_X_DISPLAY and that's the end. -ap --=-=-= Content-Type: application/octet-stream Content-Disposition: attachment; filename=gdb.log Content-Transfer-Encoding: base64 IzAgIDB4MDAwMDAwMDAwMDRmOWIwZSBpbiBmcmFtZV9oaWdobGlnaHQgKGY9MHgxMzJiNTEwKSBh dCB4dGVybS5jOjMyMDQKIzEgIDB4MDAwMDAwMDAwMDRmYTY1MiBpbiB4X2ZyYW1lX3JlaGlnaGxp Z2h0IChkcHlpbmZvPTB4MTViYTgwMCkgYXQgeHRlcm0uYzozNTg5CiMyICAweDAwMDAwMDAwMDA0 ZjljZTcgaW4geF9uZXdfZm9jdXNfZnJhbWUgKGRweWluZm89MHgxNWJhODAwLCBmcmFtZT0weDEx YzdlNjgpIGF0IHh0ZXJtLmM6MzI1NwojMyAgMHgwMDAwMDAwMDAwNGY5ZDM1IGluIHhfZm9jdXNf 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eliz@gnu.org-20130921114819-zvk3zil4jau4ucdd Windowing system distributor `The X.Org Foundation', version 11.0.10707000 System Description: Debian GNU/Linux 6.0.7 (squeeze) Important settings: value of $LC_COLLATE: C value of $LC_MESSAGES: C value of $LANG: de_DE.UTF-8 locale-coding-system: utf-8-unix default enable-multibyte-characters: t Major mode: Emacs-Lisp Minor modes in effect: workgroups-mode: t desktop-save-mode: t mimo-mode: t ispell-track-input-method: t recentf-mode: t show-paren-mode: t window-numbering-mode: t shell-dirtrack-mode: t scroll-other-window-mode: t savehist-mode: t ekey-mode: t winner-mode: t eldoc-mode: t tooltip-mode: t mouse-wheel-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t column-number-mode: t line-number-mode: t transient-mark-mode: t Recent input: i f SPC c o n d i M-/ SPC i s SPC f a l s e , SPC d u e SPC t o SPC M-h M-h DEL DEL SPC ( F R A M-/ M-/ M-/ M-/ ) SPC a n d SPC f r a m e M-/ M-/ M-h M-h h i M-/ SPC g e t s SPC c a l l e d SPC w i t h SPC M-q SPC t h e M-h a SPC f r a m e M-b DEL DEL C-p C-p C-p SPC < = = - - C-b C-b C-b C-k C-p C-p C-p C-n C-n C-n C-n C-n C-n M-f SPC d M-SPC M-f C-p C-p C-p C-j C-y C-y C-p C-n C-n C-k M-f C-e C-n SPC M-b t h e SPC d e l e t e d SPC M-f , SPC c a l l s SPC C-x o C-u C-SPC C-SPC C-SPC C-c i f r M-p C-s x _ C-s C-M-d C-M-SPC M-w C-x o C-y SPC a n d SPC M-q SPC t h a t ' s SPC t h e SPC e n d . C-x o C-x o M-q C-x o C-x b C-s C-s M-< C-x C-w / t m p / g y y C-x o C-p M-f SPC h a l f w a y M-q C-n C-l C-j C-j - a p C-x C-w b u g C-x h C-g M-x i s p e l l a 0 a a a 1 a a a a a a a a a a C-x C-s C-x h M-w M-x r e p o r t - e m b u Recent messages: Mark set [2 times] Quit Spell-checking bug using aspell with en dictionary...done Saving file /tmp/bug... 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