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]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1DA75CA0EFA for ; Tue, 26 Aug 2025 06:17:27 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 49C068E00A0; Tue, 26 Aug 2025 02:17:26 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 44D148E0090; Tue, 26 Aug 2025 02:17:26 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3149E8E00A0; Tue, 26 Aug 2025 02:17:26 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 1AEA08E0090 for ; Tue, 26 Aug 2025 02:17:26 -0400 (EDT) Received: from smtpin20.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 6A7B61377E5 for ; Tue, 26 Aug 2025 06:17:25 +0000 (UTC) X-FDA: 83817901650.20.595FB55 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf27.hostedemail.com (Postfix) with ESMTP id 8BF2E4000E for ; Tue, 26 Aug 2025 06:17:21 +0000 (UTC) Authentication-Results: imf27.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=biJr6aci; dmarc=pass (policy=quarantine) header.from=redhat.com; spf=pass (imf27.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1756189043; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=Xk7Km5HTVMpJ1b1NXcCsWrU5BXZBqRoDajCCwh1oGmE=; b=tqgASHNlYHuyXzxvUw0+jhYmSKXeVHUa7IwnrK6lBkTIUZCJCOXY7EftmO46tbW3qMtGVL AjDq+JjBvEOgMXJXYgWuxnHp/8bRhLK/oxsx73okVIEBWrZysAfl9KbZpfLssJofJJXfD+ P/WDVIsxpBOqQC/Iaey5Etao0cQn1+o= ARC-Authentication-Results: i=1; imf27.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=biJr6aci; dmarc=pass (policy=quarantine) header.from=redhat.com; spf=pass (imf27.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1756189043; a=rsa-sha256; cv=none; b=5eLpzXiaZuzkSU5igw9R+/ZevmFcdxDHS6QKTI2e0Ma94F4iLPqOPbzHOiTs9cQ8fsyTb7 8of1/KpZxmhc+4Gc9D/ovLc8ViciWvUgs9kaD32P6AXM0KQMYA90DwTFT4UhrvN3BN9Ryk rlceWDhBbyVJDMVs4Vozrx7P37O0r4E= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1756189040; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=Xk7Km5HTVMpJ1b1NXcCsWrU5BXZBqRoDajCCwh1oGmE=; b=biJr6aci7fN8j25yHr1p0PUE5A0aF6f/xPFadYx/jOfrrZSrS94Kozj9JZo/wdfvP2utRK A/H3z0uAQkvGiqMnBRpb39LDi+Nf6+Wdt4i6kY4TI8r+C8fvMctDE1pG+mwVIIPsPMiGM6 QqIUVHHJohFT5URC1jiPfhzLVRrQPn8= Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-48-RxiJZ5u_PNWlJ0SsIyJRYA-1; Tue, 26 Aug 2025 02:17:19 -0400 X-MC-Unique: RxiJZ5u_PNWlJ0SsIyJRYA-1 X-Mimecast-MFC-AGG-ID: RxiJZ5u_PNWlJ0SsIyJRYA_1756189038 Received: by mail-wm1-f72.google.com with SMTP id 5b1f17b1804b1-45a1b0511b3so30463475e9.1 for ; Mon, 25 Aug 2025 23:17:18 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1756189037; x=1756793837; h=content-transfer-encoding:in-reply-to:autocrypt:content-language :from:references:cc:to:subject:user-agent:mime-version:date :message-id:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=Xk7Km5HTVMpJ1b1NXcCsWrU5BXZBqRoDajCCwh1oGmE=; b=aJxqJX4OAwv2LWyP68/KHIj0/yQcwBNkLA1QRZYIA+mtJ6PXdavmMbHN9duGxjg2ji nB5JboQSoC2Dl9OwGQ+ilLWbbOzpNHcT39i6qDnUiX4Lr4N1EOeqQo0tCZDtkYhxqCKM +xelpUMkdYU6o1EzpWX4q6jm1bNl2Pk5eE691wlXHT2D27/Vf9Opr9hJV94WPGuMd234 qwkVaWE9sfXacHkPtcXOPU4C7tGdFvzrWK+Gd0rApl2RGzrOkJtUsNMwgFDrkm5+iAYF 0PdFqQpYRVkVv43BiPfgp/O85nYy/grucEk4wLv+khd2ffTfBrk6H67lmD1SS8INRtpR LPJg== X-Forwarded-Encrypted: i=1; AJvYcCUcWURyoFR7nC/T+UWJixDAVv/YNy6XABsf9KCYEkxsMaNeHa5KgloaPbdJtGvypijOLZOwhPa6Ig==@kvack.org X-Gm-Message-State: AOJu0Yx2qSwOgG/OzSxwxZJlMMQWw201h71CJl/YCfnwCyy033Di6GCm 5dNiCLtQSxGCnINzmo+6lJTtqJ5b23kPO3SNrq1nm24jz+JMtFHLhym/Ospu8igtzYlPOnqBU4l dWTYkYIj+50Uw/NMT1DSX609+r/UBLyu9q5YoYxA74JgGXOFJsDTl X-Gm-Gg: ASbGnctjT4yu8qcPIAEXPCjAJlLC4CuUDsr5UdysMomfLGD48RC7AGOFKdcEFpVxcAu aYohbul9L0ryHFjJmxMHh3CIhQbcl2MOr4cJDC6A96VRoqccwGCMWMVxphUzoe25fJ32/m76ggO 1wjRflstL/9wI2agOcdMqRx6x8h3Ua3OXXbRWg5adLs67Pnz+N/UY1P2QpPWJZiKtJdFMAN0IXU Fw/L748ZdVvL/DILL5nm+Esse//ET4hp6ZDAk0XbVc120Z4LGgnJcilK4SLmWe6uxQNoKGfmdt3 xXaXx6s+FHs7rvT2qoo4sbL4oJKvb/GLv7HVdDSIfaS3WpmygXZdxu4WJIG2c0rxJ9qKKQ/brw= = X-Received: by 2002:a05:600c:3b26:b0:456:19b2:6aa8 with SMTP id 5b1f17b1804b1-45b517caa99mr120121815e9.19.1756189037434; Mon, 25 Aug 2025 23:17:17 -0700 (PDT) X-Google-Smtp-Source: AGHT+IE5JT88KMbfYqdABB2ZNx/5fJ3ePuTbJHoO0rv18+tnNMdWIHHT7WWjXjYCyLy3ILR8WgCBpw== X-Received: by 2002:a05:600c:3b26:b0:456:19b2:6aa8 with SMTP id 5b1f17b1804b1-45b517caa99mr120121265e9.19.1756189036964; Mon, 25 Aug 2025 23:17:16 -0700 (PDT) Received: from ?IPV6:2a09:80c0:192:0:5dac:bf3d:c41:c3e7? ([2a09:80c0:192:0:5dac:bf3d:c41:c3e7]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45b6619b53asm9727285e9.1.2025.08.25.23.17.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 25 Aug 2025 23:17:16 -0700 (PDT) Message-ID: Date: Tue, 26 Aug 2025 08:17:14 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 08/11] mm/memory: convert print_bad_pte() to print_bad_page_map() To: Lorenzo Stoakes Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, xen-devel@lists.xenproject.org, linux-fsdevel@vger.kernel.org, nvdimm@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, Andrew Morton , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko , Dan Williams , Matthew Wilcox , Jan Kara , Alexander Viro , Christian Brauner , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Jann Horn , Pedro Falcato , Hugh Dickins , Oscar Salvador , Lance Yang References: <20250811112631.759341-1-david@redhat.com> <20250811112631.759341-9-david@redhat.com> <923b279c-de33-44dd-a923-2959afad8626@redhat.com> <9ad69d4f-69b7-4998-9639-4e8f679a2d9d@lucifer.local> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <9ad69d4f-69b7-4998-9639-4e8f679a2d9d@lucifer.local> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: wK_2GdIg8uttAZZhJpu1dnk-_atYyulLQ_6WR-nczrg_1756189038 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 8BF2E4000E X-Stat-Signature: pptyxg7f3m6j4hxoecsmu46g6rq5mwss X-Rspam-User: X-HE-Tag: 1756189041-431437 X-HE-Meta: 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 Cj/STF7L HjPbFgV1DCsg8nVP0MkDYiAWcg7PCGU0VT4+xn4bzxAk0PHoZDzAMEx5VziLqkxtdhbuXoTn0x1HaxZsH073Tk7q9/f+6H/S07CARtwlJUNtFp6e9MgLnk9q9B/GQwt6cOnXya15P987pyms6ybbufbq+UkokvitXuCGgQwiEXqkZon3vrE+sSJgm+Enhz9nnIiUiniSudNd5v8DJAe6cpzEEKwJX19siCqJchEovjwaKcJe/22+U4ZDSAC0E8bx7Jc3NLPepflpcROOTV4b6IdYVSMSpiIMDZmN1L0sEa8mStURB4puKAOvDtS/YrcY9bbBq525Bof9R20GmQzX9RP0D78mqzCU4xVw2wF79NE+2tH6HLreSFEdJLBsUdCi4zyMAhoDARK+NCqWDD7kMLspsKxx7WisWVR3LFsSi+3tIbbRQhYGBYHWtcUJUA77IqUI+KCiFlA4CznTy7+ppzjcXvA== 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: List-Subscribe: List-Unsubscribe: On 26.08.25 07:25, Lorenzo Stoakes wrote: > On Mon, Aug 25, 2025 at 02:31:00PM +0200, David Hildenbrand wrote: >> On 11.08.25 13:26, David Hildenbrand wrote: >>> print_bad_pte() looks like something that should actually be a WARN >>> or similar, but historically it apparently has proven to be useful to >>> detect corruption of page tables even on production systems -- report >>> the issue and keep the system running to make it easier to actually detect >>> what is going wrong (e.g., multiple such messages might shed a light). >>> >>> As we want to unify vm_normal_page_*() handling for PTE/PMD/PUD, we'll have >>> to take care of print_bad_pte() as well. >>> >>> Let's prepare for using print_bad_pte() also for non-PTEs by adjusting the >>> implementation and renaming the function to print_bad_page_map(). >>> Provide print_bad_pte() as a simple wrapper. >>> >>> Document the implicit locking requirements for the page table re-walk. >>> >>> To make the function a bit more readable, factor out the ratelimit check >>> into is_bad_page_map_ratelimited() and place the printing of page >>> table content into __print_bad_page_map_pgtable(). We'll now dump >>> information from each level in a single line, and just stop the table >>> walk once we hit something that is not a present page table. >>> >>> The report will now look something like (dumping pgd to pmd values): >>> >>> [ 77.943408] BUG: Bad page map in process XXX pte:80000001233f5867 >>> [ 77.944077] addr:00007fd84bb1c000 vm_flags:08100071 anon_vma: ... >>> [ 77.945186] pgd:10a89f067 p4d:10a89f067 pud:10e5a2067 pmd:105327067 >>> >>> Not using pgdp_get(), because that does not work properly on some arm >>> configs where pgd_t is an array. Note that we are dumping all levels >>> even when levels are folded for simplicity. >>> >>> Signed-off-by: David Hildenbrand >>> --- >>> include/linux/pgtable.h | 19 ++++++++ >>> mm/memory.c | 104 ++++++++++++++++++++++++++++++++-------- >>> 2 files changed, 103 insertions(+), 20 deletions(-) >>> >>> diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h >>> index bff5c4241bf2e..33c84b38b7ec6 100644 >>> --- a/include/linux/pgtable.h >>> +++ b/include/linux/pgtable.h >>> @@ -1966,6 +1966,25 @@ enum pgtable_level { >>> PGTABLE_LEVEL_PGD, >>> }; >>> +static inline const char *pgtable_level_to_str(enum pgtable_level level) >>> +{ >>> + switch (level) { >>> + case PGTABLE_LEVEL_PTE: >>> + return "pte"; >>> + case PGTABLE_LEVEL_PMD: >>> + return "pmd"; >>> + case PGTABLE_LEVEL_PUD: >>> + return "pud"; >>> + case PGTABLE_LEVEL_P4D: >>> + return "p4d"; >>> + case PGTABLE_LEVEL_PGD: >>> + return "pgd"; >>> + default: >>> + VM_WARN_ON_ONCE(1); >>> + return "unknown"; >>> + } >>> +} >> >> One kernel config doesn't like the VM_WARN_ON_ONCE here, and I don't think we >> really need it. @Andrew can you squash: > > Out of interest do you know why this is happening? xtensa right? Does > xtensa not like CONFIG_DEBUG_VM? We don't happen to include mmdebug.h in a xtensa configuration. Briefly thought about using a BUILD_BUG_ON_INVALID(), but decided to just drop it completely. -- Cheers David / dhildenb