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=-5.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 71DD1C433E0 for ; Fri, 5 Jun 2020 12:57:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4F792206A2 for ; Fri, 5 Jun 2020 12:57:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726719AbgFEM5O (ORCPT ); Fri, 5 Jun 2020 08:57:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35848 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726409AbgFEM5O (ORCPT ); Fri, 5 Jun 2020 08:57:14 -0400 Received: from Galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1DDD4C08C5C2; Fri, 5 Jun 2020 05:57:14 -0700 (PDT) Received: from p5de0bbdb.dip0.t-ipconnect.de ([93.224.187.219] helo=kurt) by Galois.linutronix.de with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.80) (envelope-from ) id 1jhBuK-00045S-4y; Fri, 05 Jun 2020 14:57:12 +0200 From: Kurt Kanzenbach To: Vladimir Oltean , linux-rt-users@vger.kernel.org, lkml , rcu@vger.kernel.org Cc: Colin King Subject: Re: stress-ng --hrtimers hangs system In-Reply-To: <4781d250-9a29-cef3-268d-7d83c98bf16a@gmail.com> References: <4781d250-9a29-cef3-268d-7d83c98bf16a@gmail.com> Date: Fri, 05 Jun 2020 14:57:06 +0200 Message-ID: <87wo4lekm5.fsf@kurt> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha512; protocol="application/pgp-signature" X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-rt-users-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org --=-=-= Content-Type: text/plain Hi Vladimir, On Fri Jun 05 2020, Vladimir Oltean wrote: > Hi, > > I was testing stress-ng on an ARM64 box and I found that it can be killed instantaneously with a --hrtimers 1 test: > https://github.com/ColinIanKing/stress-ng/blob/master/stress-hrtimers.c > The console shell locks up immediately after starting the process, and I get this rcu_preempt splat after 21 seconds, > letting me know that the grace-periods kernel thread could not run: interesting. Just tested this on an ARM64 box with v5.6-rt and the stress-ng hrtimer test works fine. No lockups, cyclictest results are looking good. So maybe this is v5.7 related. Thanks, Kurt --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEooWgvezyxHPhdEojeSpbgcuY8KYFAl7aQSIACgkQeSpbgcuY 8Ka5ew/8CnsvF7WGKuRMYATizAnmuFg6USpgofkEyTTccZ290PViHF/mjlnWm67v pxDPiE45zhf/oBa1vHbRYJC7GzxTfP6XxbF5Ntx9ZiyV8mhg0qMDCRReAqW0yZFc G13ERVDgIawP9QdFrci/q/BQA+QbVF8FrJQoecIBOSze73SI/uO2RLm2cnfzV+NL 6b3zyGeu7+y81DnlmckwMxpkUsgqah2eSEMFX07kA4c6cxp/wwmaid9BXQoWtw9k ZX1vTKY1cGyE1c4L/ndIISyxf+kk8eT+L2bZzADZWzAjGQfTMltA+/bl0G+M5A7u ZL/UoYWf2dW6KaHLVGrJEF72Wtuqq1zqQMJW0bKF27qYOZbQiZWuRwseeQCAlqar KjkGUqr0OpXPICujE7fnoS7yyIjcx05DOYCmUwagiFV+rdQTm3qfvTZbvh+FwJ4e mvli52MmuR7e7cV5m2d6nUBt5IuSy6qS80arDcs3ofzz9shIr3Ko+2a8WUuEepZW Eroa1Jho9VSwGlrjXjyM5hUJYqDqcuP39bHYi90+SalM8WWa/FH9e9VxHO4gilLT yZtnFGWg08VCh9BU5RCu78hWqTzhCbJK+FMHUNigzWE/vwjtTh5/S/ZuaJPgMJxS lARC4gAd3jClS3vQLRmamp5bmhm6QEKeyVsDPEvbr94GXnkX3og= =5WAo -----END PGP SIGNATURE----- --=-=-=--