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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 23DAAC3DA4A for ; Mon, 29 Jul 2024 08:52:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=X4YOpobL+fRJ3SyMX/sFgjW87361DO8f52zGYtGKAps=; b=hIkIXoahy2DeCNhL5boTrH95Za GwaJwWglzgTnX7axLZAYfFMCkAPvtLTLdf6ahmPiiHNIv3VmwzuzRWtk4aOYXjYwt/PH4y8ZifwAE C5jevAuouFHzVpEAeVBta3lcH4zX1orsnvRvK305wRsFFnNEfejgJ5CM42rewWz7A8AYiokzNDhkm 2y7O+HsLVyKDBBCIkmcE95aeDPvuwWCmUHAIdZcTxx8X6ISbTUgApGnNO5N2nkbYWCUdjRd7rDpER jXCKko3XMprBpPqHCMibz3IcG+Wt4HHFQi/WxjRmeMp1cdimEtJQOowNPE8bjzru5nXZUweY9qxaD MDgCxTOw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sYM6j-0000000AbPl-1jqo; Mon, 29 Jul 2024 08:51:53 +0000 Received: from pandora.armlinux.org.uk ([2001:4d48:ad52:32c8:5054:ff:fe00:142]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sYM6I-0000000AbID-43X9 for linux-arm-kernel@lists.infradead.org; Mon, 29 Jul 2024 08:51:28 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=X4YOpobL+fRJ3SyMX/sFgjW87361DO8f52zGYtGKAps=; b=JBWJYdZAYADn7mCU7Mkm1AE6Me JADa4fub7+RdUapqEblDXL/RgQnZJxiXo+4kHaqtwNpi3HGVvS7E7D27N4B/SQkZg/nD6LJ0lW5DE Uk+xYJluW2GLJLPhOepzSSyfTkqsY+D7yyglJczYN0kQv1tB6+Du1ObMqnwAgwZvwh3ZjZeS6/SrU KiycJebueRxpjfLKwWJzSLxqTpASRuAJ4JbG61VH75+KFpvSv9Iyc9xRgJVjZmF+UzDpQxUHTN0sg Si4OZ9c7PslpCtP5INbY6WcbYtjb4Wsv/gcBcw8gZcEGnoWYCIU9dWgI0Tc35qJV7CMYJQ5DaIEoe mb6J+PBg==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:50492) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1sYM65-0003Qh-0A; Mon, 29 Jul 2024 09:51:13 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1sYM68-0004Bh-2G; Mon, 29 Jul 2024 09:51:16 +0100 Date: Mon, 29 Jul 2024 09:51:15 +0100 From: "Russell King (Oracle)" To: Urja Cc: "linux-arm-kernel@lists.infradead.org" , Linus Walleij , Catalin Marinas , Kees Cook Subject: Re: Userspace programs segfaulting since CONFIG_ARM_PAN was introduced for LPAE Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240729_015127_026542_4D668894 X-CRM114-Status: UNSURE ( 9.07 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Jul 19, 2024 at 11:09:23AM +0000, Urja wrote: > Hi, > > Trying to start KDE Plasma (startplasma-wayland) on my ASUS C201 (RK3288) with any kernel since "ARM: 9358/2: Implement PAN for LPAE by TTBR0 page table walks disablement"* and CONFIG_ARM_PAN=y (enabled by default for an LPAE kernel in that commit) causes a segfault. This is a known bug. Make sure you have this applied: eebadafc3b14 ("ARM: 9398/1: Fix userspace enter on LPAE with CC_OPTIMIZE_FOR_SIZE=y") Thanks. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!