From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.9]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7D1254438B for ; Wed, 15 Oct 2025 05:23:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.9 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760505813; cv=none; b=LenvZ8uYCBAQlq/2wXdn42+eAAI09XPROs2bmKUWBrkpcW7N+V0ODiwoyAOv6haCQKgOa4ug0P/GgbZ/8VUgU4Pq4ETxR5cxyeZATsz+lQCVLbzGbopA2YaqKj+hqAh4Vn7IdIL9rXtLXBRZDKTsYVLbv3JlA3fQ+qqU7wyFgIQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760505813; c=relaxed/simple; bh=eK0inZ4rNk5w2Qq8gSVATW8wmK6XxymTxfw6OxJSz54=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=tTa0ity0jYqkCBqVGwtqCNPZe1l1oY0eDW8dPRs01uLvsETVnYaKC2fn3LnbKXWd71WqYDKplwUkPIQZUalUNPzPw9I5lNTOwFD5spXPMVoCPlrgP4wZ/K9XDW2vthPRrEoz4qhwyTAalh2waAKs9TmcbQ8NGZ1b1le6HbT3nBQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=deT1h9c0; arc=none smtp.client-ip=198.175.65.9 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="deT1h9c0" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1760505812; x=1792041812; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=eK0inZ4rNk5w2Qq8gSVATW8wmK6XxymTxfw6OxJSz54=; b=deT1h9c0YoNr37UIT34YuMOL5JQMyV5ot1ANLpfQGrSmHq+pzscEiEiA SUgq6nnuOvWoqts2iOv1ge5iazp/Lg7oLTAiiCQBO9shIjc8fQ8j0JBvq WZAtc43ZcX1T/NbkPlyUQ2r1XYpx4iIfR0GEHN8PlJzK8scY2Twebvxvr MMxmEtcN/NkrbAKMDgbj1G/JoC+alZCGgXSeY7fY94qcYNRZlKg1DFdgd d9M7VLxxvUdiI71MUWxvVhpgGcvhwLgGd3jFR3o65XNSnwmvYiHRcZKTX 6gn2ikSLrn5klCT4H0Io8/rig5nfLMBZwx2gq0xJR2B452/NKP1LJdPlT Q==; X-CSE-ConnectionGUID: ho5+mbh3Ty6RWukiQDjCDQ== X-CSE-MsgGUID: vSJ5FJosTVaWKVSAq1mpBA== X-IronPort-AV: E=McAfee;i="6800,10657,11582"; a="85290275" X-IronPort-AV: E=Sophos;i="6.19,230,1754982000"; d="scan'208";a="85290275" Received: from fmviesa006.fm.intel.com ([10.60.135.146]) by orvoesa101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Oct 2025 22:23:31 -0700 X-CSE-ConnectionGUID: T0k5dDuKTp6Gt6SVFGKEog== X-CSE-MsgGUID: eUacngtfTZetlmPxF9skJQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,230,1754982000"; d="scan'208";a="182018745" Received: from allen-sbox.sh.intel.com (HELO [10.239.159.30]) ([10.239.159.30]) by fmviesa006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Oct 2025 22:23:24 -0700 Message-ID: Date: Wed, 15 Oct 2025 13:19:44 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 3/7] x86/mm: Use 'ptdesc' when freeing PMD pages To: Dave Hansen , Joerg Roedel , Will Deacon , Robin Murphy , Kevin Tian , Jason Gunthorpe , Jann Horn , Vasant Hegde , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Alistair Popple , Peter Zijlstra , Uladzislau Rezki , Jean-Philippe Brucker , Andy Lutomirski , Yi Lai , David Hildenbrand , Lorenzo Stoakes , "Liam R . Howlett" , Andrew Morton , Vlastimil Babka , Mike Rapoport , Michal Hocko , Matthew Wilcox Cc: iommu@lists.linux.dev, security@kernel.org, x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Dave Hansen References: <20251014130437.1090448-1-baolu.lu@linux.intel.com> <20251014130437.1090448-4-baolu.lu@linux.intel.com> Content-Language: en-US From: Baolu Lu In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10/15/25 07:19, Dave Hansen wrote: > On 10/14/25 06:04, Lu Baolu wrote: >> -#if defined(CONFIG_SPLIT_PMD_PTLOCKS) >> - >> +#if defined(CONFIG_SPLIT_PMD_PTLOCKS) || defined(CONFIG_X86_64) > > What's with the #ifdef munging? It's not mentioned in the changelog. > > I went looking at this because pmd_free_pte_page() is right in the > middle of the action on this reported use after free: > >> https://lore.kernel.org/all/68eeb99e.050a0220.91a22.0220.GAE@google.com/ > > so something fishy is going on. It would be great to narrow that report > down to a _specific_ patch in the series. Yes. I am trying to reproduce the issue on my local machine and then narrow down the reported issue. Thanks, baolu