From owner-freebsd-hackers@FreeBSD.ORG Fri May 27 23:40:32 2011 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 8036A106564A for ; Fri, 27 May 2011 23:40:32 +0000 (UTC) (envelope-from vasanth.raonaik@gmail.com) Received: from mail-pz0-f54.google.com (mail-pz0-f54.google.com [209.85.210.54]) by mx1.freebsd.org (Postfix) with ESMTP id 581D28FC15 for ; Fri, 27 May 2011 23:40:32 +0000 (UTC) Received: by pzk27 with SMTP id 27so1228981pzk.13 for ; Fri, 27 May 2011 16:40:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:date:message-id:subject:from:to :content-type; bh=sJC1wyx4rjKtMqT7vcwDGPlcI2tybjTCW7OuVCe1RSw=; b=jt/tvHdlJJbW4TFZXUhRGOamlqxqol2swOb8cs0Oxnwm/bmL7QY1jQYjwMnin8wlWO VZJJGJT2QqqRw1l22S09FpOimIjsSlwvWT6Kx0PnqcSkYC9NkXYl9DIN/o66rlE5jwKT zKtE0nEWSuAflH/unSxewrTFB5n8CXra9NBR4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=kCFjIPy/1ZJVkDZhTtbbzuMwvMwBVpbebNEccqi1UArIeK0ef5L9hqzqMaJWa3Yq9Q lEkrZIILDeLNxKH4M8ev4WyaiWo4zmRXNCtsKBIBu6g5Yf9e+J0BK0J+3R3yEoncVStU 8xw3TQNhoxrDP4LTgmTll9Qg9nJTnaCKB7x+0= MIME-Version: 1.0 Received: by 10.68.14.202 with SMTP id r10mr1068100pbc.492.1306538209288; Fri, 27 May 2011 16:16:49 -0700 (PDT) Received: by 10.68.48.67 with HTTP; Fri, 27 May 2011 16:16:49 -0700 (PDT) Date: Fri, 27 May 2011 19:16:49 -0400 Message-ID: From: vasanth raonaik To: freebsd-hackers@freebsd.org Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Subject: double fault panic while using gdb amd64 (remote debugging) X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 27 May 2011 23:40:32 -0000 Hello hackers, I see a "double fault" error on the console while remote debugging a freebsd kernel 6.1 on amd64 the moment I press continue on a break point. I googled and found similar query but couldn't find a solution to this issue. Is this a known issue? Has there been any fix made for this issue in the latest freebsd? here is the email that I found while searching. http://forum.nginx.org/read.php?23,183241 ================= Hi, I have looked at archives but with no output. I am running freebsd7.2 amd64 as a virtual machine(VM) in vmware ESX server. I have configured remote gdb to debug the kernel modules. My problem is that whenever the breakpoint is hit and the I issue next or step kernel panics with "double fault" error. This configuration was working for 32-bit machine very well. I am trying to debug the tmpfs module. Panic message on console is: Fatal double fault rip = 0xffffffff80552be1 rsp = 0xffffffff006f5000 rbp = 0xffffffff006f5000 cpuid = 0; apic id = 00 panic: double fault cpuid = 0 Uptime: 1h16m8s Physical memory: 4555 MB Dumping 207 MB: 192 176 160 144 128 112 96 80 64 48 32 16 Dump complete I tried searching this problem on google also but with no help. Any help will be appreciated. Thanks, Mayank =================