From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 27135 invoked by alias); 13 Jun 2005 15:36:03 -0000 Mailing-List: contact gdb-help@sources.redhat.com; run by ezmlm Precedence: bulk List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-owner@sources.redhat.com Received: (qmail 27121 invoked by uid 22791); 13 Jun 2005 15:35:58 -0000 Received: from ext-nj2gw-8.online-age.net (HELO ext-nj2gw-8.online-age.net) (64.14.56.44) by sourceware.org (qpsmtpd/0.30-dev) with ESMTP; Mon, 13 Jun 2005 15:35:58 +0000 Received: from int-nj2gw-2.online-age.net (int-nj2gw-2 [3.159.236.66]) by ext-nj2gw-8.online-age.net (8.12.11/8.12.11/990426-RLH) with ESMTP id j5DFZiCa011187; Mon, 13 Jun 2005 11:35:44 -0400 Received: from uswaumsxb4medge.am.med.ge.com (localhost [127.0.0.1]) by int-nj2gw-2.online-age.net (8.12.9/8.12.8/990426-RLH) with ESMTP id j5DFZgec020370; Mon, 13 Jun 2005 11:35:43 -0400 (EDT) Received: from uswaumsxb3medge.am.med.ge.com (uswaumsxb3medge.med.ge.com [3.57.24.74]) by uswaumsxb4medge.am.med.ge.com with SMTP (Microsoft Exchange Internet Mail Service Version 5.5.2656.59) id MRM1QWH2; Mon, 13 Jun 2005 10:35:42 -0500 Received: from gsao.gso.med.ge.com (uswaucs03 [3.57.24.237]) by uswaumsxb3medge.am.med.ge.com with SMTP (Microsoft Exchange Internet Mail Service Version 5.5.2656.59) id M6D4WJZJ; Mon, 13 Jun 2005 10:35:42 -0500 Received: from godzilla (IDENT:12539@godzilla [3.70.204.208]) by gsao.gso.med.ge.com (8.12.10+Sun/8.12.10) with ESMTP id j5DFaVmk009381; Mon, 13 Jun 2005 10:36:31 -0500 (CDT) Date: Mon, 13 Jun 2005 15:36:00 -0000 From: Rich Coe To: "H. J. Lu" Cc: gdb@sources.redhat.com Subject: Re: no stack trace with 2.6.11 and gdb 6.3 Message-ID: <20050613103412.16e73c25@godzilla> In-Reply-To: <20050613152646.GB11261@lucon.org> References: <20050610193720.GA24094@nevyn.them.org> <200506102115.QAA91634@morpheus> <20050611005113.GA29491@nevyn.them.org> <20050611022148.GA14914@lucon.org> <20050613101629.4f54fde1@godzilla> <20050613152646.GB11261@lucon.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SW-Source: 2005-06/txt/msg00114.txt.bz2 On Mon, 13 Jun 2005 08:26:46 -0700 "H. J. Lu" wrote: > On Mon, Jun 13, 2005 at 10:16:29AM -0500, Rich Coe wrote: > > On Fri, 10 Jun 2005 19:21:48 -0700 > > "H. J. Lu" wrote: > > > On Fri, Jun 10, 2005 at 08:51:13PM -0400, Daniel Jacobowitz wrote: > > > > > > > > No, I told you that I expected it to work in CVS. If it does not, then > > > > someone needs to reproduce your problem using an unpatched GDB and > > > > debug it. I do not have a Red Hat x86_64 system on which to reproduce > > > > it, but I may be able to elsewhere - if I have time. > > > > > > Gdb should support vDSO on Linux 2.6.11/x86_64 with this patch: > > > > > > http://sources.redhat.com/ml/gdb/2005-06/msg00095.html > > > > > > If it doesn't work, I will be interested to know. > > > H.J. > > > > The patch makes it work only if you start the program from the gdb > > command line. As I said in my original post: > > You are saying: > > 1. # gdb foo > works. > > 2. But > # foo # foo & > # gdb foo pid > doesn't work? Yes. > Tell me how to reproduce it. I will take a look. > Compile the following program, -m32. run it in the background, and attach with gdb. get a bt. Results: gdb gtest 29769 GNU gdb Red Hat Linux (6.3.0.0-1.10rh) Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "x86_64-redhat-linux-gnu"...Using host libthread_db library "/lib64/tls/libthread_db.so.1". Attaching to program: /data/rhcoe/data/mr/gtest, process 29769 Reading symbols from /lib/tls/libc.so.6...done. Loaded symbols for /lib/tls/libc.so.6 Reading symbols from /lib/ld-linux.so.2...done. Loaded symbols for /lib/ld-linux.so.2 0xffffe405 in ?? () (gdb) bt #0 0xffffe405 in ?? () #1 0xffffd9f8 in ?? () #2 0x4ba3e45d in ___newselect_nocancel () from /lib/tls/libc.so.6 #3 0x080484fe in myselect () #4 0x00000000 in ?? () (gdb) add-symbol-file-from-memory 0xffffe000 Reading symbols from shared object read from target memory...done. (gdb) bt #0 0xffffe405 in __kernel_vsyscall () #1 0x4ba3e45d in ___newselect_nocancel () from /lib/tls/libc.so.6 #2 0x080484fe in myselect () #3 0x08048565 in func_two () #4 0x0804858e in func_one () #5 0x080485cf in main () -- Rich Coe richard.coe@med.ge.com General Electric Healthcare Technologies Global Software Platforms, Computer Technology Team