From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 0B8EF29B766; Mon, 7 Sep 2026 22:28:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788820100; cv=none; b=D6e/EFV8RcsmacmpF7qUrhsBtxl9fHOUlT/CVDDZjpxZKNnFRyPOoTcgXWqdN/miyurRdhkKnoKJ3K5zx3E0p4amrI/Vkby16vDx7nsxFcy8SaVlFr9+bqtk0TLesc+jaI2ejaRIl2Cm6ibeKbdb28L0Kv2GRfRIJmRmtNYNs2Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788820100; c=relaxed/simple; bh=Wf+uxAz4MM2OY6rJ1HTjJe/OkxX7/CjswcmFiSaeuw8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=dwzh1d/llvfZ09dYQq/3e5P4ttOzqSjzbEQ+LmaymWVPsb6ZWZwjfIPUlJ7kOyOC/P3zfSdLXgnNKPm6+nKTYqUntM69l3aYdOkSF4uB/1TFoqCKg9dvcnNPku0uQ7OQ9Zy/nVlQzdKt9imaaaMxT9QPv2ttjqTx5lTF1v28ZqU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=EGK0y7af; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="EGK0y7af" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F01791F00A3A; Mon, 7 Sep 2026 22:28:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788820098; bh=owiM88nOXIURj9qsoqZkIThz+09xXyFf6EzyHiifw8g=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=EGK0y7afjUov9Ix1YKfPXOXxtjZPFp17S1hhmqU5jV9XARk5IMOuvXtRwCjvdB0oP mCgzYLTFtI0UuiSoIsX8ad0PT35AGINRmdFpWri+jH+vhuex7djSoachl9YxlempuK U4iB1VVrrcWizs5D5iBDSgj/vzMQ3qZGHSgAJLLBSWi0FJIH9pv7Z+A8ImFHJlhBBH IlG/ZvP4o5WzkGJXab1QHu+o8Mv5yoggZ8NZKHqsl/EMH6olHW88LO+QGMpwAdr0u4 tiAcW0e+Exr8gBeIjvywcMtLXpvFQ6yXIulxjLLtXV2G+p5WM6c8f/70LhWTFJ+DR2 XbhqPP6uVGgpA== Date: Mon, 7 Sep 2026 15:28:13 -0700 From: Nathan Chancellor To: Dave Hansen Cc: Mike Rapoport , Dave Hansen , linux-tip-commits@vger.kernel.org, Juergen Gross , "Lorenzo Stoakes (ARM)" , syzbot@syzkaller.appspotmail.com, Atish Patra , Nikunj A Dadhania , stable@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, Peter Zijlstra Subject: Re: [tip: x86/urgent] x86/mm/pat: Fix effective RW computation in lookup_address_in_pgd_attr() Message-ID: <20260907222813.GB1619741@ax162> References: <20260813-cpa-fixes-v2-5-39b4ff90f91d@kernel.org> <178837401172.3717435.314324339347590321.tip-bot2@tip-bot2> <20260905044253.GA3816371@ax162> <20260906181247.GA1148584@ax162> <1987b7d6-7aa3-4bcd-9082-f2cdfde7c1e4@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1987b7d6-7aa3-4bcd-9082-f2cdfde7c1e4@intel.com> On Sun, Sep 06, 2026 at 12:12:54PM -0700, Dave Hansen wrote: > On 9/6/26 11:12, Nathan Chancellor wrote: > > Hmmm, I don't see a warning prior to this patch though. Do you mean that > > this patch is just revealing the bad behavior that you mention below? > > Yeah, "fixes" was a bad word to use. > > The W^X detection has been broken for a while. The patch you bisected to > fixes the W^X detection. It doesn't actually cause the issue. Ah okay, that parses way better. I assume this will be sorted out without further information needed from me but I am happy to test a patch when available. -- Cheers, Nathan