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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id CC50DC28CF5 for ; Wed, 26 Jan 2022 12:46:48 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 124AA6B0072; Wed, 26 Jan 2022 07:46:48 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 0AE336B0074; Wed, 26 Jan 2022 07:46:48 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EB8D86B0075; Wed, 26 Jan 2022 07:46:47 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0128.hostedemail.com [216.40.44.128]) by kanga.kvack.org (Postfix) with ESMTP id DBE2B6B0072 for ; Wed, 26 Jan 2022 07:46:47 -0500 (EST) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 9C783181CA34A for ; Wed, 26 Jan 2022 12:46:47 +0000 (UTC) X-FDA: 79072412454.08.9A271CB Received: from mail-ej1-f45.google.com (mail-ej1-f45.google.com [209.85.218.45]) by imf16.hostedemail.com (Postfix) with ESMTP id 3DF5F180026 for ; Wed, 26 Jan 2022 12:46:46 +0000 (UTC) Received: by mail-ej1-f45.google.com with SMTP id ka4so38775463ejc.11 for ; Wed, 26 Jan 2022 04:46:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=soleen.com; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=EpKbbi8If8FEZ41RpRjGsQUgi5Ly7DPWQgM8YNkUuFM=; b=GYV8COX4chqvZKYYDsg1d65DhuqAftl7wfKlqfjE5qaHDkRbOTvD4+3PHXkbcp91h4 SZVPGemrx/PCrpTY9k2zjkBXxe32gIRJRAPANZB23wK0GYgcqAA9Kt5ZnXECCDIyOgsk P/yNaZKYQ/PS9Wu06w2TzSlw6lzPF3hr2y28FQf6a/VTrxtX98H8qZZFwXkG1TVNQpP/ X2pM5oOcs9UY+z9L9DlMbx9/zgHxFczb97qvuTJXX7zr44QZhvInje1oo3juCyNViJTF 1Qwlfuflr1gwQN2uVHEx78ue6dKAT+PP6bUCBHWi8PI1SCjOXFMOYHYm7kE2qX47Qnrb mCSQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=EpKbbi8If8FEZ41RpRjGsQUgi5Ly7DPWQgM8YNkUuFM=; b=PunPjxmWZZie6jo+55GaW4N3PIQSzEDe/l4854dpiFrzQU4zsX0hVNd6Dp7oZaQCF0 QRnStgb7WdMAoVyEwxcRackw9xmm0TFsxmbvBCcspEOzW9j6sZUbMbFmTfEnYn29RnfV qgXGCtMFxMt9foIeATvqbHflJ3Vr/QuGeQF1TyX9Y+kSuxxYDoNlYvRF8qDqeJ6v2c83 cVd+Xra54ZW6e4+47q4HoPc5RzqEoXXbKoq1jYxqHw7pcthXvD4cKz5dw9wlFMc3XI/h UkKxwSONotp9GvKdxB77h3ptkhZLRDzBKSjtKfH//xgMfhrKzP6LlU4nf2NwYH9Box5s 4Tgg== X-Gm-Message-State: AOAM531yV5H5sggxxVhPAZGRqn7my14YsNhboECUYtQACVilCsLWubx1 JgQLa5Hor18eko2qXy0hv4p+2qdxLbf/tlUAxkOWAw== X-Google-Smtp-Source: ABdhPJy0M7qt9u7TnsdhZKRCYYlBSMNAKBXctrLxWBHR1/+AzFPRfNgCRJxyqJfogiWpzIufvsN4yCr7JV23yhJ1jxA= X-Received: by 2002:a17:907:7d8c:: with SMTP id oz12mr897545ejc.320.1643201205147; Wed, 26 Jan 2022 04:46:45 -0800 (PST) MIME-Version: 1.0 References: <20220126060514.1574935-1-pasha.tatashin@soleen.com> <20220126060514.1574935-5-pasha.tatashin@soleen.com> <61833f93-31b5-206f-b8c7-a2e55091ac@google.com> In-Reply-To: <61833f93-31b5-206f-b8c7-a2e55091ac@google.com> From: Pasha Tatashin Date: Wed, 26 Jan 2022 07:46:09 -0500 Message-ID: Subject: Re: [PATCH v3 4/4] mm/page_table_check: check entries at pmd levels To: David Rientjes Cc: LKML , linux-mm , Andrew Morton , Paul Turner , Wei Xu , Greg Thelen , Ingo Molnar , Will Deacon , Mike Rapoport , Dave Hansen , "H. Peter Anvin" , "Aneesh Kumar K.V" , Jiri Slaby , Muchun Song , Fusion Future , Hugh Dickins , Zi Yan , Anshuman Khandual Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 3DF5F180026 X-Rspam-User: nil Authentication-Results: imf16.hostedemail.com; dkim=pass header.d=soleen.com header.s=google header.b=GYV8COX4; dmarc=none; spf=pass (imf16.hostedemail.com: domain of pasha.tatashin@soleen.com designates 209.85.218.45 as permitted sender) smtp.mailfrom=pasha.tatashin@soleen.com X-Stat-Signature: y5xazzr9m5tc7thdpi4pz4y8qjr1ooc1 X-HE-Tag: 1643201206-769673 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 Wed, Jan 26, 2022 at 1:45 AM David Rientjes wrote: > > On Wed, 26 Jan 2022, Pasha Tatashin wrote: > > > syzbot detected a case where the page table counters were not properly > > updated. > > > > Is there a Reported-by tag that syzbot wants us to use to track this? Google internal syzbot found it, so I did not add Reported-by as there is no public e-mail to reference. However, I added all the necessary steps to repro this problem to the cover letter. > > > This looks right, I'm wondering if we want to add a > mmap_assert_write_locked(mm) to collapse_and_free_pmd(). Good idea, I will add it in the next revision. Thanks, Pasha