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 X-Spam-Level: X-Spam-Status: No, score=-1.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DCE82C43381 for ; Thu, 28 Mar 2019 14:18:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A43C221773 for ; Thu, 28 Mar 2019 14:18:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553782716; bh=raNP0o0LHAF54cnpBluCD+15Xf5D06acnuWxoMSOBIk=; h=Subject:From:To:Cc:Date:In-Reply-To:References:List-ID:From; b=fRW9f6+Hp/UZTo+Ujjs0IHMw3gL2KhigK3rcNsNwgsnHK6CITterjrvaO7zKY/om6 wtfBwPL1AYEl+rMTOdeihxyP1M+ITw9JghfJCyQo+2RMEKnewTa8bZ6UtQkhSYEM1R YfEcrcw7Wm3pTqDAzybWsc4i9fsFWCq35tdvfYD8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726235AbfC1OSg (ORCPT ); Thu, 28 Mar 2019 10:18:36 -0400 Received: from mail.kernel.org ([198.145.29.99]:40054 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726076AbfC1OSg (ORCPT ); Thu, 28 Mar 2019 10:18:36 -0400 Received: from tzanussi-mobl (c-98-220-238-81.hsd1.il.comcast.net [98.220.238.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5355E2075E; Thu, 28 Mar 2019 14:18:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553782715; bh=raNP0o0LHAF54cnpBluCD+15Xf5D06acnuWxoMSOBIk=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=q33SWZVqPCQE9IuzO0uCjCEl81rAIyt7uOV3hJGPLIHNpcxPhCtSgoDD4h7GR8QMg 8BGnbRV7x0bnqN/+1BN9ulBmg1LYhyg314C68P4ljGejg9rsTJV9/C6PiLd8XS2QKX SbVy6VUzkI3sPnvVaAJ1Gh3t4dN1c0MJf0FNsNd0= Message-ID: <1553782714.2655.2.camel@kernel.org> Subject: Re: ARMv8 fp register corruption in 4.14 PREEMPT_RT series From: Tom Zanussi To: Allen Martin Cc: linux-rt-users@vger.kernel.org, anup.pemmaiah@gmail.com, bigeasy@linutronix.de Date: Thu, 28 Mar 2019 09:18:34 -0500 In-Reply-To: <20190327213555.GA16845@nvidia.com> References: <20190327213555.GA16845@nvidia.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.26.1-1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-rt-users-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org Hi Allen, On Wed, 2019-03-27 at 14:35 -0700, Allen Martin wrote: > Hi Tom, I can confirm the ARMv8 fp register corruption reported here: > > https://marc.info/?l=linux-rt-users&m=153930857708206&w=2 > > still exists in 4.14.106-rt56. I was able to reproduce this on both > A57 and Carmel ARMv8 CPUs using the float_bessel subtest of > LTP. This > fix was to backport the following patch from 4.18.y-rt to 4.14-rt: > > 3afdfe419c33c1655d0763e070350aad44416594 > arm64: fpsimd: use preemp_disable in addition to local_bh_disable() > > Are you able to pick up this patch into 4.14-rt? I'm sure Anup and I > are not the only ones who are hitting this. > Yes, I was just about to start a new 4.14 update and will pull this one in. Thanks for letting me know. Tom > -Allen