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 B3583F531DE for ; Tue, 14 Apr 2026 11:08:55 +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=x3S9jBB7rFaohFOnGlp4KwVhYdhC0mAEOE/r6Elp0J8=; b=t+Eg6eci/ASSovNrzlPbaIVRa+ pL5SXayY6wqUh2t1B+7mqp7C+eiHMwJ9QaVz8mDOXZYEPTAEudMbTcNlGRTYmxa2ZMQG0mMrRvp4v QX4sLbKJiX2jDPrvM80QrfsTG0gAhMCZpsgYT1fFTJ4Q/drURrhaJQvd/T8pueYaH6GrI0z5CzI3t 7/nlkjNU1Ts3l41mL+vZq3cDRpNlTAXuKtDyZFmCPOwTMLyzFJLdrX/TFIGQ4YNu/5BwSdV9DtXuI JspqwVs+SceYKnIFmfFpO3uoU9JFUAEj+89jVAfTsjnFUxvehUoeM3hEEJe23E4BEw/kxRKey2lga nmIxLZbQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wCbdT-0000000HD4X-22R7; Tue, 14 Apr 2026 11:08:51 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wCbdQ-0000000HD4C-1di7 for linux-arm-kernel@lists.infradead.org; Tue, 14 Apr 2026 11:08:49 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 795C44415F; Tue, 14 Apr 2026 11:08:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0FCC6C19425; Tue, 14 Apr 2026 11:08:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776164926; bh=sNu71ZUb1rt4ab2E8eZagKk8jYhy4eDjDlSs+G1tla4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=fLgGDLRcloWUP15mYzJp7RDXnNZmpO/6pWOEi45FADVz3SD32RzX9h4NfzJY5Kqwl 7K/1YTy21PD2fzwt7TO10R4VdrpI3vol53VyB2M+Z9tDEzzhVjVgGnTJIfI664EFWv CRWcfyOx5DvTUCNi9MPDcCBT6rdurpP+9uro+a5aSUb1xztssrUFZ0Zb7MqOk4EJT8 9qXUQVmr7vcFrP88fkXuh7uHBWURQHUDaTtAp+Vue0AGSNrkGjj2kDmwkEwEW6f4HP GzbQyGmYowRVYmnb3TD5xP4rVOPtNVVP/wfrWFNQq6efLbCgl1c1zRvVsUdFt1BJpS LNzZR9cJgjEqw== Date: Tue, 14 Apr 2026 12:08:42 +0100 From: Will Deacon To: Brian Ruley Cc: "Russell King (Oracle)" , Steve Capper , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, catalin.marinas@arm.com Subject: Re: [PATCH] mm/arm: pgtable: remove young bit check for pte_valid_user Message-ID: References: <20260409125446.981747-1-brian.ruley@gehealthcare.com> 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-20260414_040848_449234_CC59D29D X-CRM114-Status: GOOD ( 11.59 ) 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 Tue, Apr 14, 2026 at 10:44:05AM +0300, Brian Ruley wrote: > On Apr 13, Brian Ruley wrote: > > > > In the meanwhile, I'll see if I can add some instrumentation to > > verify this is the bug we're seeing. > > The instrumentation worked (used the same ring buffer approach to track > dcache flushes). Here's the output: > > ``` > kernel: [48629.557043] SIGILL at b6b80ac0 cpu 1 pid 32663 linux_pte=8eff659f hw_pte=8eff6e7e young=1 exec=1 > kernel: [48629.557157] dcache flush START cpu0 pfn=8eff6 ts=48629557020154 > kernel: [48629.557207] dcache flush FINISH cpu0 pfn=8eff6 ts=48629557036154 > kernel: [48629.557230] dcache flush SKIPPED cpu1 pfn=8eff6 ts=48629557020154 > audisp-syslog: type=ANOM_ABEND msg=audit(1776154637.460:15): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=32663 comm="journalctl" exe="/usr/bin/journalctl" sig=4 res=1 AUID="unset" UID="root" GID="root" > ``` Red-handed! Please send a patch for review (perhaps you can include that snippet in the commit message). Cheers, Will