Received: by 2002:a05:6902:102b:0:0:0:0 with SMTP id x11csp1344009ybt; Thu, 9 Jul 2020 04:52:36 -0700 (PDT) X-Google-Smtp-Source: ABdhPJy8HF5VidauCAT9hb4jg/MLEVrWLAgXRKR/xEfoYAy+B6rKDtLBUTYcaoJiW7qaVXC6gBpO X-Received: by 2002:a05:6402:1c11:: with SMTP id ck17mr68332735edb.38.1594295556051; Thu, 09 Jul 2020 04:52:36 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1594295556; cv=none; d=google.com; s=arc-20160816; b=NAPq5FzlSjp84qgMV+fOVkn5nG3zIBzlEc48XuYBHE/O5hm6wIHZhdeeBCO24u5hlP bVVMRMN4u9Wzj8UFm4jX/GLkm/PHBbZ3Lj9kpqNYPIhEwmLiaMw96+bc5TxeVRrR/3xl OzEDLwYNsJ1nICf+XiIcaiUxMDDeY63H5B6vyZsK2swrTR+hG0FBF5qoxjVXywSVYR5s AFAVMXel9UfFtAOFXyuU2yhnHrQbCF9EFQez0c7Zpg0EKwe4e2qkcqRx24u6z1q2SgES 973HlNJnMb+YFW5VVT/Vcl90afrOqMD5wasxIHYuF/WBGVdJ8+zVsOVgQbgratrylXro ykWg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding :content-language:in-reply-to:mime-version:user-agent:date :message-id:from:references:cc:to:subject; bh=mcDP4cN4c6nagpyQO/FbKVi8ihLke6uxHJirhI1u/mc=; b=mMmp7m7akE0rci7djG2ApkZ5iYMavYXXcx4JY9Oqf6NU4j7hwzEGZsNLcA9GbRhqYo 2D9A5I5u0vlAQbd8vPGSb+rjkiHqULD10aWQD/m2Cl+uKd9SxDsLdzaSGx8OWRbGvc6E w0V7TcQUNGtUYIdYJM/3wmQ2PCeerHHorwVHLv4ObcpI5RgZuUQqDYHF7xEqZsdgMGkI dZvfy/mNRgh+5SbwJqkod2WO+afun1MIiMHFy0MBjT4t18xEcUuusUIZaQm8Z+tkEFOk 9vSKO8pB+5O8jiI4ybPicR5RiP8+445kYRfbC103P8iIZU8HlShpQQET9P3QpWW1p9OV P2+w== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id l5si1844651edq.166.2020.07.09.04.52.13; Thu, 09 Jul 2020 04:52:36 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727078AbgGILtm (ORCPT + 99 others); Thu, 9 Jul 2020 07:49:42 -0400 Received: from szxga06-in.huawei.com ([45.249.212.32]:38260 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726387AbgGILtm (ORCPT ); Thu, 9 Jul 2020 07:49:42 -0400 Received: from DGGEMS401-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id 5895B6936C31BE6C6F6A; Thu, 9 Jul 2020 19:49:40 +0800 (CST) Received: from [10.174.185.226] (10.174.185.226) by DGGEMS401-HUB.china.huawei.com (10.3.19.201) with Microsoft SMTP Server id 14.3.487.0; Thu, 9 Jul 2020 19:49:33 +0800 Subject: Re: [REPORT] possible circular locking dependency when booting a VM on arm64 host To: Salil Mehta CC: Marc Zyngier , Thomas Gleixner , "Linux Kernel Mailing List" , "linux-arm-kernel@lists.infradead.org" , "Zhuangyuzeng (Yisen)" , "Wanghaibin (D)" References: <7225eba7-6e5e-ec7e-953b-d1fef0b1775b@huawei.com> <134ee452eda74f0cbdc10354fe66c48e@huawei.com> From: Zenghui Yu Message-ID: <7c1bb3c1-3f64-8c24-ed59-eb3da7bf6643@huawei.com> Date: Thu, 9 Jul 2020 19:49:33 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: <134ee452eda74f0cbdc10354fe66c48e@huawei.com> Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.174.185.226] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2020/7/9 18:54, Salil Mehta wrote: > Hi Yuzenghui, > I will try to reproduce it today at our platform. Just one question is it easily > reproducible or is a rare occurrence? Salil, it's 100% reproducible once you start a guest. You don't even need to assign hostdev to the VM. Thanks, Zenghui