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 B79D8C282DE for ; Thu, 13 Mar 2025 09:30:13 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7040E10E811; Thu, 13 Mar 2025 09:30:13 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="a1n8oktb"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.14]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4727A10E816; Thu, 13 Mar 2025 09:30:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1741858212; x=1773394212; h=message-id:date:mime-version:cc:subject:to:references: from:in-reply-to:content-transfer-encoding; bh=9A9aWfK66AcpdLfD2H0fwAZBqHh3y2XzHBKKmsqHBwA=; b=a1n8oktbMV69jTulkYfL0gI9tJFOXJily0AGTg0eidyPM9W+LcITOdmn cV82Slzkeaf4KyeNRa26v63Q719j5ZTAJ5S8DflEC2T9zUz/Oh+OnGgSs c8lCMb2iciokkLoJIsMeL8+FAGYveLo8Z2bo2j+jk68sJRl1oFyUe3XDu UQGhI7rd8hmBHbRFBdCUY6uQLC+f6Cn5ojlam8pITbfCfbc5lxp68kvXP OrTjNx0PhjHVV5EaOzxX/jGK3RmaiVCRV1RdZ9JSHIqOPEO6DcBh4u5Y8 E3qr6oVNfXQIpahum5mNC8eOqMixkigLjqK4It3jy7nC2amxklfI4758Z g==; X-CSE-ConnectionGUID: WYrNM4WzSW+N2yLAbdZgsA== X-CSE-MsgGUID: eUUpC37RSdqEXOS6ctUQXg== X-IronPort-AV: E=McAfee;i="6700,10204,11371"; a="43165185" X-IronPort-AV: E=Sophos;i="6.14,244,1736841600"; d="scan'208";a="43165185" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by fmvoesa108.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Mar 2025 02:30:12 -0700 X-CSE-ConnectionGUID: ThHyzZFJSJ21MNu6FnbVTw== X-CSE-MsgGUID: bFY35IFOQBq8cUZQfmaHZg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.14,244,1736841600"; d="scan'208";a="151851976" Received: from blu2-mobl.ccr.corp.intel.com (HELO [10.124.240.153]) ([10.124.240.153]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Mar 2025 02:30:10 -0700 Message-ID: <9902ee4c-6223-4550-b25c-984629618f58@linux.intel.com> Date: Thu, 13 Mar 2025 17:30:07 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Cc: baolu.lu@linux.intel.com, "intel-gfx@lists.freedesktop.org" , "intel-xe@lists.freedesktop.org" , "iommu@lists.linux.dev" Subject: Re: Regression on drm-tip To: "Borah, Chaitanya Kumar" References: Content-Language: en-US From: Baolu Lu In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-BeenThere: intel-xe@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Xe graphics driver List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-xe-bounces@lists.freedesktop.org Sender: "Intel-xe" On 2025/3/13 16:51, Borah, Chaitanya Kumar wrote: > Hello Lu, > > Hope you are doing well. I am Chaitanya from the linux graphics team in Intel. > > This mail is regarding a regression we are seeing in our CI runs[1] on drm-tip repository. > > ````````````````````````````````````````````````````````````````````````````````` > <4>[    2.856622] WARNING: possible circular locking dependency detected > <4>[    2.856631] 6.14.0-rc5-CI_DRM_16217-gc55ef90b69d3+ #1 Tainted: G          I > <4>[    2.856642] ------------------------------------------------------ > <4>[    2.856650] swapper/0/1 is trying to acquire lock: > <4>[    2.856657] ffffffff8360ecc8 (iommu_probe_device_lock){+.+.}-{3:3}, at: iommu_probe_device+0x1d/0x70 > <4>[    2.856679] >                   but task is already holding lock: > <4>[    2.856686] ffff888102ab6fa8 (&device->physical_node_lock){+.+.}-{3:3}, at: intel_iommu_init+0xea1/0x1220 > ````````````````````````````````````````````````````````````````````````````````` > Details log can be found in [2]. > > After bisecting the tree, the following patch [3] seems to be the first "bad" commit > > ````````````````````````````````````````````````````````````````````````````````````````````````````````` > commit b150654f74bf0df8e6a7936d5ec51400d9ec06d8 > Author: Lu Baolumailto:baolu.lu@linux.intel.com > Date:   Fri Feb 28 18:27:26 2025 +0800 > >     iommu/vt-d: Fix suspicious RCU usage > > ````````````````````````````````````````````````````````````````````````````````````````````````````````` > > We also verified that if we revert the patch the issue is not seen. > > Could you please check why the patch causes this regression and provide a fix if necessary? Sure. I will look into this issue. Thanks, baolu