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=-5.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 65D46C433DB for ; Sun, 3 Jan 2021 13:13:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 286BA207FB for ; Sun, 3 Jan 2021 13:13:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727200AbhACNLc (ORCPT ); Sun, 3 Jan 2021 08:11:32 -0500 Received: from outpost1.zedat.fu-berlin.de ([130.133.4.66]:37397 "EHLO outpost1.zedat.fu-berlin.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725889AbhACNLb (ORCPT ); Sun, 3 Jan 2021 08:11:31 -0500 Received: from inpost2.zedat.fu-berlin.de ([130.133.4.69]) by outpost.zedat.fu-berlin.de (Exim 4.94) with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (envelope-from ) id 1kw39l-001rwI-Ku; Sun, 03 Jan 2021 14:10:49 +0100 Received: from p5b13a61e.dip0.t-ipconnect.de ([91.19.166.30] helo=[192.168.178.139]) by inpost2.zedat.fu-berlin.de (Exim 4.94) with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (envelope-from ) id 1kw39k-000OeZ-Tg; Sun, 03 Jan 2021 14:10:49 +0100 Subject: Re: [sparc64] running stress-ng and a sparc64 hardware / kernel woes To: Anatoly Pugachev , Linux Kernel list Cc: Sparc kernel list References: From: John Paul Adrian Glaubitz Message-ID: Date: Sun, 3 Jan 2021 14:10:48 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Original-Sender: glaubitz@physik.fu-berlin.de X-Originating-IP: 91.19.166.30 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Anatoly! On 1/3/21 1:56 PM, Anatoly Pugachev wrote: > Running a simple stress-ng as a non-privileged (non root) user : > > stress-ng --opcode 1 --timeout 60 --metrics-brief > > will almost always bring the linux kernel to an unusable state, > starting from "Unable to handle kernel NULL pointer dereference", > "Bogus kernel PC [0000000000000000] in fault handler", "Kernel > unaligned access at TPC", "Unable to handle kernel paging request at > virtual address" and "rcu: INFO: rcu_sched detected stalls on > CPUs/tasks"... This looks very similar to the kernel crashes on SPARC that we saw on the buildds for the GCC testsuite in the past (and other packages). I wonder whether we can use stress-ng to provoke the kernel crash on POWER when hosting big-endian VMs with high load on little-endian hosts [1]. Adrian > [1] https://bugzilla.kernel.org/show_bug.cgi?id=206669 -- .''`. John Paul Adrian Glaubitz : :' : Debian Developer - glaubitz@debian.org `. `' Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913