From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9A105C43381 for ; Thu, 21 Mar 2019 20:22:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6771A218D3 for ; Thu, 21 Mar 2019 20:22:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728825AbfCUUWq (ORCPT ); Thu, 21 Mar 2019 16:22:46 -0400 Received: from mx2.cyber.ee ([193.40.6.72]:54666 "EHLO mx2.cyber.ee" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728316AbfCUUWq (ORCPT ); Thu, 21 Mar 2019 16:22:46 -0400 To: LKML , linux-mm@kvack.org From: Meelis Roos Subject: CONFIG_DEBUG_VIRTUAL breaks boot on x86-32 Message-ID: <4d5ee3b0-6d47-a8df-a6b3-54b0fba66ed7@linux.ee> Date: Thu, 21 Mar 2019 22:22:43 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: et-EE Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I tried to debug another problem and turned on most debug options for memory. The resulting kernel failed to boot. Bisecting the configurations led to CONFIG_DEBUG_VIRTUAL - if I turned it on in addition to some other debug options, the machine crashed with kernel BUG at arch/x86/mm/physaddr.c:79! Screenshot at http://kodu.ut.ee/~mroos/debug_virtual-boot-hang-1.jpg The machine was Athlon XP with VIA KT600 chipset and 2G RAM. -- Meelis Roos