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=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 4648AC4361B for ; Tue, 8 Dec 2020 13:48:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 115F123AA9 for ; Tue, 8 Dec 2020 13:48:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729287AbgLHNsF (ORCPT ); Tue, 8 Dec 2020 08:48:05 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:37532 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726738AbgLHNsE (ORCPT ); Tue, 8 Dec 2020 08:48:04 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1607435198; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=PgDVMF6zomYKlcivF1VhzvM1BcYHrc98uBdNjH1KPmA=; b=ONSjP6ZiAerlYnrkCVYt2QcpmBEhwvDdga3ggkFH8Di4fPfhSaPV/AIZqt08NfLedahqxe k6ojsrgZXvr1USPC1kLjgM9iMUJqCbs10Z6Mt2aGY1cclFoWOeIfAZbo1pLPRgi3yvkQR7 XLuDadPH+W2GdIALJvLro4Y8+aBz3Z8= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-460-ThVQy7QoOOyTS3-OJpnwLg-1; Tue, 08 Dec 2020 08:46:35 -0500 X-MC-Unique: ThVQy7QoOOyTS3-OJpnwLg-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 1F57CC287; Tue, 8 Dec 2020 13:46:33 +0000 (UTC) Received: from ovpn-114-102.rdu2.redhat.com (ovpn-114-102.rdu2.redhat.com [10.10.114.102]) by smtp.corp.redhat.com (Postfix) with ESMTP id 86AAA6E519; Tue, 8 Dec 2020 13:46:24 +0000 (UTC) Message-ID: <589c684a04b4e91e99b22409c614baea35dc93ad.camel@redhat.com> Subject: Re: [PATCH v4 11/19] sched/core: Make migrate disable and CPU hotplug cooperative From: Qian Cai To: Valentin Schneider Cc: Peter Zijlstra , tglx@linutronix.de, mingo@kernel.org, linux-kernel@vger.kernel.org, bigeasy@linutronix.de, qais.yousef@arm.com, swood@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vincent.donnefort@arm.com, tj@kernel.org, ouwen210@hotmail.com Date: Tue, 08 Dec 2020 08:46:23 -0500 In-Reply-To: References: <20201023101158.088940906@infradead.org> <20201023102347.067278757@infradead.org> Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2020-12-07 at 19:27 +0000, Valentin Schneider wrote: > Ok, can reproduce this on a TX2 on next-20201207. I didn't use your config, > I oldconfig'd my distro config and only modified it to CONFIG_PREEMPT_NONE. > Interestingly the BUG happens on CPU127 here too... I think that number is totally random. For example, on this x86, it could happen for CPU8 or CPU111.