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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 6623DECE588 for ; Tue, 15 Oct 2019 15:21:00 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 30FE82086A for ; Tue, 15 Oct 2019 15:21:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 30FE82086A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id A642B8E0005; Tue, 15 Oct 2019 11:20:59 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A12AF8E0001; Tue, 15 Oct 2019 11:20:59 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8B4118E0005; Tue, 15 Oct 2019 11:20:59 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0225.hostedemail.com [216.40.44.225]) by kanga.kvack.org (Postfix) with ESMTP id 6BBD88E0001 for ; Tue, 15 Oct 2019 11:20:59 -0400 (EDT) Received: from smtpin22.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with SMTP id 0C04F4DA8 for ; Tue, 15 Oct 2019 15:20:59 +0000 (UTC) X-FDA: 76046381838.22.power43_7ca8020064814 X-HE-Tag: power43_7ca8020064814 X-Filterd-Recvd-Size: 4754 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf03.hostedemail.com (Postfix) with ESMTP for ; Tue, 15 Oct 2019 15:20:56 +0000 (UTC) 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 68FF928; Tue, 15 Oct 2019 08:20:55 -0700 (PDT) Received: from [10.162.42.142] (p8cg001049571a15.blr.arm.com [10.162.42.142]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 754823F718; Tue, 15 Oct 2019 08:20:44 -0700 (PDT) Subject: Re: [PATCH V6 0/2] mm/debug: Add tests validating architecture page table helpers To: Qian Cai , linux-mm@kvack.org Cc: Andrew Morton , Vlastimil Babka , Greg Kroah-Hartman , Thomas Gleixner , Mike Rapoport , Jason Gunthorpe , Dan Williams , Peter Zijlstra , Michal Hocko , Mark Rutland , Mark Brown , Steven Price , Ard Biesheuvel , Masahiro Yamada , Kees Cook , Tetsuo Handa , Matthew Wilcox , Sri Krishna chowdary , Dave Hansen , Russell King - ARM Linux , Michael Ellerman , Paul Mackerras , Martin Schwidefsky , Heiko Carstens , "David S. Miller" , Vineet Gupta , James Hogan , Paul Burton , Ralf Baechle , "Kirill A . Shutemov" , Gerald Schaefer , Christophe Leroy , Mike Kravetz , linux-snps-arc@lists.infradead.org, linux-mips@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org References: <1571131302-32290-1-git-send-email-anshuman.khandual@arm.com> <1571150502.5937.39.camel@lca.pw> From: Anshuman Khandual Message-ID: Date: Tue, 15 Oct 2019 20:51:11 +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: <1571150502.5937.39.camel@lca.pw> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 10/15/2019 08:11 PM, Qian Cai wrote: > The x86 will crash with linux-next during boot due to this series (v5) = with the > config below plus CONFIG_DEBUG_VM_PGTABLE=3Dy. I am not sure if v6 woul= d address > it. >=20 > https://raw.githubusercontent.com/cailca/linux-mm/master/x86.config >=20 > [=C2=A0=C2=A0=C2=A033.862600][=C2=A0=C2=A0=C2=A0=C2=A0T1] page:ffffea00= 09000000 is uninitialized and poisoned > [=C2=A0=C2=A0=C2=A033.862608][=C2=A0=C2=A0=C2=A0=C2=A0T1] raw: ffffffff= ffffffff ffffffffffffffff ffffffffffffffff > ffffff871140][=C2=A0=C2=A0=C2=A0=C2=A0T1]=C2=A0=C2=A0? _raw_spin_unlock= _irq+0x27/0x40 > [=C2=A0=C2=A0=C2=A033.871140][=C2=A0=C2=A0=C2=A0=C2=A0T1]=C2=A0=C2=A0? = rest_init+0x307/0x307 > [=C2=A0=C2=A0=C2=A033.871140][=C2=A0=C2=A0=C2=A0=C2=A0T1]=C2=A0=C2=A0ke= rnel_init+0x11/0x139 > [=C2=A0=C2=A0=C2=A033.871140][=C2=A0=C2=A0=C2=A0=C2=A0T1]=C2=A0=C2=A0? = rest_init+0x307/0x307 > [=C2=A0=C2=A0=C2=A033.871140][=C2=A0=C2=A0=C2=A0=C2=A0T1]=C2=A0=C2=A0re= t_from_fork+0x27/0x50 > [=C2=A0=C2=A0=C2=A033.871140][=C2=A0=C2=A0=C2=A0=C2=A0T1] Modules linke= d in: > [=C2=A0=C2=A0=C2=A033.871140][=C2=A0=C2=A0=C2=A0=C2=A0T1] ---[ end trac= e e99d392b0f7befbd ]--- > [=C2=A0=C2=A0=C2=A033.871140][=C2=A0=C2=A0=C2=A0=C2=A0T1] RIP: 0010:all= oc_gigantic_page_order+0x3fe/0x490 Hmm, with defconfig (DEBUG_VM=3Dy and DEBUG_VM_PGTABLE=3Dy) it does not c= rash but with the config above, it does. Just wondering if it is possible that the= se pages might not been initialized yet because DEFERRED_STRUCT_PAGE_INIT=3D= y ? [ 13.898549][ T1] page:ffffea0005000000 is uninitialized and poisone= d [ 13.898549][ T1] raw: ffffffffffffffff ffffffffffffffff fffffffffff= fffff ffffffffffffffff [ 13.898549][ T1] raw: ffffffffffffffff ffffffffffffffff fffffffffff= fffff ffffffffffffffff [ 13.898549][ T1] page dumped because: VM_BUG_ON_PAGE(PagePoisoned(p= )) [ 13.898549][ T1] ------------[ cut here ]------------ [ 13.898549][ T1] kernel BUG at ./include/linux/mm.h:1107! [ 13.898549][ T1] invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASA= N PTI [ 13.898549][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.4.0-rc= 3-next-20191015+ #