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=-2.5 required=3.0 tests=MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,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 EB76EECE588 for ; Wed, 16 Oct 2019 08:20:28 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B350021848 for ; Wed, 16 Oct 2019 08:20:28 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B350021848 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 322298E0005; Wed, 16 Oct 2019 04:20:28 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 2AAC68E0001; Wed, 16 Oct 2019 04:20:28 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 124CE8E0005; Wed, 16 Oct 2019 04:20:28 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0139.hostedemail.com [216.40.44.139]) by kanga.kvack.org (Postfix) with ESMTP id DF4E98E0001 for ; Wed, 16 Oct 2019 04:20:27 -0400 (EDT) Received: from smtpin23.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with SMTP id 727B94DC9 for ; Wed, 16 Oct 2019 08:20:27 +0000 (UTC) X-FDA: 76048950894.23.badge11_3e6dc7c24404 X-HE-Tag: badge11_3e6dc7c24404 X-Filterd-Recvd-Size: 4741 Received: from mx1.suse.de (mx2.suse.de [195.135.220.15]) by imf12.hostedemail.com (Postfix) with ESMTP for ; Wed, 16 Oct 2019 08:20:26 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 8F4AEBA75; Wed, 16 Oct 2019 08:20:24 +0000 (UTC) Date: Wed, 16 Oct 2019 10:20:22 +0200 From: Michal Hocko To: Anshuman Khandual Cc: Qian Cai , linux-mm@kvack.org, Andrew Morton , Vlastimil Babka , Greg Kroah-Hartman , Thomas Gleixner , Mike Rapoport , Jason Gunthorpe , Dan Williams , Peter Zijlstra , 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 Subject: Re: [PATCH V6 0/2] mm/debug: Add tests validating architecture page table helpers Message-ID: <20191016082022.GN317@dhcp22.suse.cz> References: <1571131302-32290-1-git-send-email-anshuman.khandual@arm.com> <1571150502.5937.39.camel@lca.pw> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) 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 Tue 15-10-19 20:51:11, Anshuman Khandual wrote: >=20 >=20 > 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 wo= uld address > > it. > >=20 > > https://raw.githubusercontent.com/cailca/linux-mm/master/x86.config > >=20 > > [=A0=A0=A033.862600][=A0=A0=A0=A0T1] page:ffffea0009000000 is uniniti= alized and poisoned > > [=A0=A0=A033.862608][=A0=A0=A0=A0T1] raw: ffffffffffffffff ffffffffff= ffffff ffffffffffffffff > > ffffff871140][=A0=A0=A0=A0T1]=A0=A0? _raw_spin_unlock_irq+0x27/0x40 > > [=A0=A0=A033.871140][=A0=A0=A0=A0T1]=A0=A0? rest_init+0x307/0x307 > > [=A0=A0=A033.871140][=A0=A0=A0=A0T1]=A0=A0kernel_init+0x11/0x139 > > [=A0=A0=A033.871140][=A0=A0=A0=A0T1]=A0=A0? rest_init+0x307/0x307 > > [=A0=A0=A033.871140][=A0=A0=A0=A0T1]=A0=A0ret_from_fork+0x27/0x50 > > [=A0=A0=A033.871140][=A0=A0=A0=A0T1] Modules linked in: > > [=A0=A0=A033.871140][=A0=A0=A0=A0T1] ---[ end trace e99d392b0f7befbd = ]--- > > [=A0=A0=A033.871140][=A0=A0=A0=A0T1] RIP: 0010:alloc_gigantic_page_or= der+0x3fe/0x490 >=20 > Hmm, with defconfig (DEBUG_VM=3Dy and DEBUG_VM_PGTABLE=3Dy) it does not= crash but > with the config above, it does. Just wondering if it is possible that t= hese > pages might not been initialized yet because DEFERRED_STRUCT_PAGE_INIT=3D= y ? Quite likely. You need to wait for page_alloc_init_late to finish. >=20 > [ 13.898549][ T1] page:ffffea0005000000 is uninitialized and poiso= ned > [ 13.898549][ T1] raw: ffffffffffffffff ffffffffffffffff fffffffff= fffffff ffffffffffffffff > [ 13.898549][ T1] raw: ffffffffffffffff ffffffffffffffff fffffffff= fffffff 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 KA= SAN PTI > [ 13.898549][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.4.0-= rc3-next-20191015+ # --=20 Michal Hocko SUSE Labs