From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Aneesh Kumar K.V" Subject: Re: kvm guest debug using gdb on x86 Date: Wed, 20 May 2009 00:40:09 +0530 Message-ID: <20090519191009.GA8872@skywalker> References: <20090519185312.GA32697@skywalker> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8BIT To: kvm@vger.kernel.org, jan.kiszka@siemens.com Return-path: Received: from e23smtp04.au.ibm.com ([202.81.31.146]:57548 "EHLO e23smtp04.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753743AbZESTKb convert rfc822-to-8bit (ORCPT ); Tue, 19 May 2009 15:10:31 -0400 Received: from d23relay01.au.ibm.com (d23relay01.au.ibm.com [202.81.31.243]) by e23smtp04.au.ibm.com (8.13.1/8.13.1) with ESMTP id n4JJ8GXx020878 for ; Wed, 20 May 2009 05:08:16 +1000 Received: from d23av03.au.ibm.com (d23av03.au.ibm.com [9.190.234.97]) by d23relay01.au.ibm.com (8.13.8/8.13.8/NCO v9.2) with ESMTP id n4JJAJoV512224 for ; Wed, 20 May 2009 05:10:31 +1000 Received: from d23av03.au.ibm.com (loopback [127.0.0.1]) by d23av03.au.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id n4JJAJAY032760 for ; Wed, 20 May 2009 05:10:19 +1000 Content-Disposition: inline In-Reply-To: <20090519185312.GA32697@skywalker> Sender: kvm-owner@vger.kernel.org List-ID: On Wed, May 20, 2009 at 12:23:12AM +0530, Aneesh Kumar K.V wrote: > Hi, > > With the latest qemu-kvm and 2.6.30-rc6 kernel i am not able to get > the guest debugging with gdb. I get the following error. > > $gdb ./vmlinux > GNU gdb 6.8-debian > Copyright (C) 2008 Free Software Foundation, Inc. > License GPLv3+: GNU GPL version 3 or later > > This is free software: you are free to change and redistribute it. > There is NO WARRANTY, to the extent permitted by law. Type "show > copying" > and "show warranty" for details. > This GDB was configured as "i486-linux-gnu"... > (gdb) b do_fork > Breakpoint 1 at 0xc106cfc8: file kernel/fork.c, line 1347. > (gdb) target remote localhost:1234 > Remote debugging using localhost:1234 > [New Thread 1] > Remote 'g' packet reply is too long: > 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 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 > (gdb) > > any patches that i can try ? Works better with the four patches found at http://git.kiszka.org/?p=kvm-userspace.git;a=shortlog;h=refs/heads/queues/gdb But a next and continue doesn't get the prompt back on gdb. The guest does stops the execution. -aneesh