From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#7952: 24.0.50; crash in find_interval Date: Sat, 19 Mar 2011 14:51:25 +0200 Message-ID: <83zkor9stu.fsf@gnu.org> References: <87r5ag7a72.fsf@silenus.orebokech.com> <87lj0c1bj8.fsf@silenus.orebokech.com> <8339mkrzic.fsf@gnu.org> <87ei6417kl.fsf@silenus.orebokech.com> <83r5a3qtts.fsf@gnu.org> Reply-To: Eli Zaretskii NNTP-Posting-Host: lo.gmane.org X-Trace: dough.gmane.org 1300540057 29069 80.91.229.12 (19 Mar 2011 13:07:37 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Sat, 19 Mar 2011 13:07:37 +0000 (UTC) Cc: romain@orebokech.com, 7952@debbugs.gnu.org To: Andreas Schwab Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sat Mar 19 14:07:33 2011 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Q0vsR-0005aq-1u for geb-bug-gnu-emacs@m.gmane.org; Sat, 19 Mar 2011 14:07:32 +0100 Original-Received: from localhost ([127.0.0.1]:47844 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Q0vsP-0001jf-F9 for geb-bug-gnu-emacs@m.gmane.org; Sat, 19 Mar 2011 09:07:29 -0400 Original-Received: from [140.186.70.92] (port=32957 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Q0vs4-0001WX-56 for bug-gnu-emacs@gnu.org; Sat, 19 Mar 2011 09:07:09 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Q0vs2-0002dE-Lp for bug-gnu-emacs@gnu.org; Sat, 19 Mar 2011 09:07:07 -0400 Original-Received: from debbugs.gnu.org ([140.186.70.43]:44794) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Q0vs2-0002dA-K1 for bug-gnu-emacs@gnu.org; Sat, 19 Mar 2011 09:07:06 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.69) (envelope-from ) id 1Q0veQ-00069C-7O; Sat, 19 Mar 2011 08:53:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: debbugs-submit-bounces@debbugs.gnu.org Resent-To: owner@debbugs.gnu.org Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sat, 19 Mar 2011 12:53:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 7952 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 7952-submit@debbugs.gnu.org id=B7952.130053913023570 (code B ref 7952); Sat, 19 Mar 2011 12:53:02 +0000 Original-Received: (at 7952) by debbugs.gnu.org; 19 Mar 2011 12:52:10 +0000 Original-Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1Q0vdZ-000687-Oo for submit@debbugs.gnu.org; Sat, 19 Mar 2011 08:52:09 -0400 Original-Received: from mtaout20.012.net.il ([80.179.55.166]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1Q0vdW-00067b-3n for 7952@debbugs.gnu.org; Sat, 19 Mar 2011 08:52:07 -0400 Original-Received: from conversion-daemon.a-mtaout20.012.net.il by a-mtaout20.012.net.il (HyperSendmail v2007.08) id <0LIB000002763W00@a-mtaout20.012.net.il> for 7952@debbugs.gnu.org; Sat, 19 Mar 2011 14:51:23 +0200 (IST) Original-Received: from HOME-C4E4A596F7 ([77.124.131.120]) by a-mtaout20.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0LIB00MEH2DKDRD0@a-mtaout20.012.net.il>; Sat, 19 Mar 2011 14:51:23 +0200 (IST) In-reply-to: X-012-Sender: halo1@inter.net.il X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list Resent-Date: Sat, 19 Mar 2011 08:53:02 -0400 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) 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: , Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:45167 Archived-At: > From: Andreas Schwab > Cc: Romain Francoise , 7952@debbugs.gnu.org > Date: Sat, 19 Mar 2011 13:14:48 +0100 > > Eli Zaretskii writes: > > > There's nothing in this code that modifies `tree' in any way. (I even > > disassembled the code to make sure.) So how come a non-NULL value > > becomes NULL here? > > It isn't, otherwise you would get a crash. Unless it happens after the place where `tree' is dereferenced. > > Since this value is passed in a register by the caller and kept in a > > register from the very beginning of the function, not even some > > missing GCPRO somewhere could explain this. What am I missing? > > Probably your toolchain is too old to be able to produce complete unwind > information. I doubt that, since it's GDB 7.2. Maybe it's a GCC problem. > Try setting a breakpoint at the abort line to get a better picture. It's a core file. Romain, could you try that, perhaps? In any case, we could look at TOTAL_LENGTH of the pointer in the frame where it has a non-NULL value.