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=-5.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 5BCC0C43331 for ; Sun, 29 Mar 2020 14:37:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2B4B92073B for ; Sun, 29 Mar 2020 14:37:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728284AbgC2Ohw (ORCPT ); Sun, 29 Mar 2020 10:37:52 -0400 Received: from foss.arm.com ([217.140.110.172]:59190 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727488AbgC2Ohv (ORCPT ); Sun, 29 Mar 2020 10:37:51 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id E3FAC31B; Sun, 29 Mar 2020 07:37:50 -0700 (PDT) Received: from [10.163.1.70] (unknown [10.163.1.70]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 6C1943F68F; Sun, 29 Mar 2020 07:37:44 -0700 (PDT) Subject: Re: [mm/debug] f8bf55f05f: BUG:non-zero_pgtables_bytes_on_freeing_mm To: kernel test robot Cc: Stephen Rothwell , Christophe Leroy , Qian Cai , Catalin Marinas , Ingo Molnar , Mike Rapoport , Vineet Gupta , Will Deacon , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , "Kirill A. Shutemov" , Paul Walmsley , Palmer Dabbelt , Andrew Morton , LKML , lkp@lists.01.org References: <20200328130737.GA11705@shao2-debian> From: Anshuman Khandual Message-ID: Date: Sun, 29 Mar 2020 20:07:38 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20200328130737.GA11705@shao2-debian> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/28/2020 06:37 PM, kernel test robot wrote: > [ 9.304270] debug_vm_pgtable: debug_vm_pgtable: Validating architecture page table helpers > [ 9.306147] random: get_random_u32 called from debug_vm_pgtable+0x2c/0x6a5 with crng_init=1 > [ 9.306206] BUG: non-zero pgtables_bytes on freeing mm: -4096 This problem is on i386 platform via CONFIG_EXPERT with CONFIG_X86_PAE still enabled. This particular configuration is not supported (even if it could be tested via CONFIG_EXPERT) with ARCH_HAS_DEBUG_VM_PGTABLE. diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index beea77046f9b..df8a19e52e82 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -61,6 +61,7 @@ config X86 select ARCH_CLOCKSOURCE_INIT select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI select ARCH_HAS_DEBUG_VIRTUAL + select ARCH_HAS_DEBUG_VM_PGTABLE if !X86_PAE select ARCH_HAS_DEVMEM_IS_ALLOWED select ARCH_HAS_ELF_RANDOMIZE select ARCH_HAS_FAST_MULTIPLIER