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 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BA611C77B7D for ; Fri, 21 Apr 2023 14:09:26 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A530910EE36; Fri, 21 Apr 2023 14:09:22 +0000 (UTC) X-Greylist: delayed 323 seconds by postgrey-1.36 at gabe; Wed, 12 Apr 2023 09:48:55 UTC Received: from mail78-58.sinamail.sina.com.cn (mail78-58.sinamail.sina.com.cn [219.142.78.58]) by gabe.freedesktop.org (Postfix) with ESMTPS id 96DA510E74E for ; Wed, 12 Apr 2023 09:48:55 +0000 (UTC) X-SMAIL-HELO: localhost.localdomain Received: from 106.23.202.1.static.bjtelecom.net (HELO localhost.localdomain)([1.202.23.106]) by sina.com (172.16.235.25) with ESMTP id 64367D3D00007DDC; Wed, 12 Apr 2023 17:43:27 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com Authentication-Results: sina.com; spf=none smtp.mailfrom=hdanton@sina.com; dkim=none header.i=none; dmarc=none action=none header.from=hdanton@sina.com X-SMAIL-MID: 5956834209835 From: Hillf Danton To: Rui Salvaterra Date: Wed, 12 Apr 2023 17:43:15 +0800 Message-Id: <20230412094315.1445-1-hdanton@sina.com> In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Mailman-Approved-At: Fri, 21 Apr 2023 14:09:19 +0000 Subject: Re: [Intel-gfx] INFO: rcu_sched detected expedited stalls X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: paulmck@kernel.org, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, rodrigo.vivi@intel.com Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Wed, 12 Apr 2023 10:15:29 +0100 Rui Salvaterra > Hi, everyone, > > I apologise in advance if I've sent this to {too many, the wrong} > people. For some time now, I've been getting sporadic (in about one > out of five boots) DRM-related RCU complaints on an Ivy Bridge-based > (Core i7-3720QM) Mac Mini. Call trace (on Linux 6.3-rc6) follows: Feel free to post again after taking a look at the popular format of syzbot report[1]. [1] https://lore.kernel.org/lkml/000000000000f1a9d205f909f327@google.com/ > [ 5.794026] rcu: INFO: rcu_sched detected expedited stalls on > CPUs/tasks: { 0-.... } 3 jiffies s: 309 root: 0x1/. > [ 5.794044] rcu: blocking rcu_node structures (internal RCU debug): > [ 5.794045] Sending NMI from CPU 1 to CPUs 0: > [ 5.794049] NMI backtrace for cpu 0 > [ 5.794051] CPU: 0 PID: 537 Comm: Xorg Not tainted 6.3.0-rc6-debug+ #57 > [ 5.794053] Hardware name: Apple Inc. Macmini6,2/Mac-F65AE981FFA204ED, BIOS 429.0.0.0.0 03/18/2022