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=-0.7 required=3.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,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 32753C4321D for ; Sun, 19 Aug 2018 06:29:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D5781215EB for ; Sun, 19 Aug 2018 06:29:15 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D5781215EB Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=gmx.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726131AbeHSJjR (ORCPT ); Sun, 19 Aug 2018 05:39:17 -0400 Received: from mout.gmx.net ([212.227.17.21]:41869 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725929AbeHSJjR (ORCPT ); Sun, 19 Aug 2018 05:39:17 -0400 Received: from homer.simpson.net ([188.174.240.126]) by mail.gmx.com (mrgmx103 [212.227.17.168]) with ESMTPSA (Nemesis) id 0MQih7-1fPawq25xV-00U0v5; Sun, 19 Aug 2018 08:28:37 +0200 Message-ID: <1534660115.6187.4.camel@gmx.de> Subject: Re: [BUG v4.14-rt] kernel BUG at /work/rt/stable-rt.git/kernel/sched/core.c:1639! From: Mike Galbraith To: Steven Rostedt , Thomas Gleixner , Sebastian Andrzej Siewior Cc: Julia Cartwright , linux-rt-users , LKML Date: Sun, 19 Aug 2018 08:28:35 +0200 In-Reply-To: <1534597992.15909.17.camel@gmx.de> References: <20180817162340.6e8482fd@gandalf.local.home> <1534588142.2516.10.camel@gmx.de> <1534597992.15909.17.camel@gmx.de> Content-Type: text/plain; charset="ISO-8859-15" X-Mailer: Evolution 3.26.6 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-Provags-ID: V03:K1:wYuIAjAJ3h3t+ns7gRieQewbmX/XXesaWEsYA7W+XXcJj/R7P54 x6sSoo83lDo3xIzkPiRt7L13evmmM5nLY7UXR07vZ4Tm5CeuRguxbADFP2Gwiy91jw+rhL8 61V/KSFhzB98pSLORJqhakgzi0+92nqVgGGvZA7cHY9Wol/0WkWzdaAy5kto/HI5eoa3RI7 d3WdodVTd35Q9ghpFO5zg== X-UI-Out-Filterresults: notjunk:1;V01:K0:/LRdgoCdHoI=:3J7agH4hK1AqBF4SuBN+1z Plr4rjL2Ig6RAG5BfFDGOSCkn9z7BARi2aW8uX8wfv18EWN/tSb4Rg4DcetJwYVF6Qp+R7Y54 bIRyIpSY84AhMpLBAuRKXV+VuOhkP2PFkuGMMCAjztYpJhUqOg83C9UVUIAkN11jllaYSEmPM GW/DS33wgkRbV9a22XwEDDB4P8Qsi9s6jQcDK/jvmJKKPFIw3+Wsd/yrugYRJmFk2yZjhtpv+ XUHx0ZTsn2uVY+wHGk/rfT+f0YulVF6PDg6OhxjjjGtzUR2KazyawsBoZ89KZXfiaPYmwHwv5 5p13RVOrwUboqO0DJmGRDIPvFPHIAPjRQmf2489lu8smuHwq3GP7kbj002ykev6Lm2MqSl0dL 1tLzO8+ElrLFd2n8IxmH/K1O7mkjut+0kN/9hH7psCLqzGAfMNEpAMD4qmB/1BKxWHawcFeO+ F1dmPQ5fO/CjR1dwYRQ1opxzLfENYBa2AMFO1bSpnDXjAECnLC8GQoCJMAmEznHG1gRnueeOH ph32VLwsizN6mWjSszUBbtjgZnAVlCP19pCc9LxvbhE+fJyclolwnD3Js+CmxVKUuDF0n2yhV s0WEA7sziVCxMJ9BQxGmSbV5/IVjieurU58zB1pSBal2Oab/h/LuJktj0vjD5LpN6Dmi02Ax6 NyzbHz0+4cIacsgIYDquKbAskJFemFaUkI6MSFAv7dhqxylalsrGfzn1qeYIg+B6ev3Zh+g4b WeCNmrs2Z/aMTvAmf8qqV53qkmVLXEmv5INAXS7CL1Cauiy3LAJUmeM08/kPe1DOgd7Rsjvod QQsj/Z2 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 2018-08-18 at 15:13 +0200, Mike Galbraith wrote: > seems it has be something from the 4.17 cycle that went back to 4.14- > stable after 4.1[56]-stable trees went extinct. See ("sched/core: Require cpu_active() in select_task_rq(), for user tasks") Fix it like so? sched: Allow pinned user tasks to be awakened to the CPU they pinned Since 7af443ee16976, select_fallback_rq() will BUG() if the CPU to which a task has pinned itself and pinned becomes !cpu_active() while it slept. Serving a 10 megaton eviction notice is neither helpful nor required, the task will migrate when it can do so. Signed-off-by: Mike Galbraith --- kernel/sched/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -980,7 +980,7 @@ static inline bool is_cpu_allowed(struct if (!cpumask_test_cpu(cpu, p->cpus_ptr)) return false; - if (is_per_cpu_kthread(p)) + if (is_per_cpu_kthread(p) || __migrate_disabled(p)) return cpu_online(cpu); return cpu_active(cpu);