From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: <thomas.monjalon@6wind.com> Received: from mail-wm0-f46.google.com (mail-wm0-f46.google.com [74.125.82.46]) by dpdk.org (Postfix) with ESMTP id B87F1ADAC for <dev@dpdk.org>; Thu, 19 May 2016 18:43:36 +0200 (CEST) Received: by mail-wm0-f46.google.com with SMTP id n129so239243550wmn.1 for <dev@dpdk.org>; Thu, 19 May 2016 09:43:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=6wind-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:user-agent:in-reply-to :references:mime-version:content-transfer-encoding; bh=3Sn4OZCNuqgZ660IVpjXlVAaY5YjIAGnhRjqb+BCgVg=; b=henzoNAaooFhSCLvWR9hKD+FrHkDg7WgtVdmh905zg6+U4Xt9asUXKYs3IqdkNDL5O xhA+nSr+YtSypw4bB4OT4foQw9uRw+nY77fvfctW7LyINvniQtG/zO7ABaNZeO1rNjg+ jUx/0/HyiIrNHl4GgsD4Ha7iC5oRGOJzYibTXrej0lgmjO2o1yhpuzOBERI71gL6loL7 2XUaiK4jVAVJjND47MY1b1RiQuE1PPR80yqGBJQzlWjaAFWjn9h9+2S49KzPFfiRjXhw E1it2s9OknLNibCGf4rifUhPrA5RP6oGqkX+xZ+jVEc5iKUJU9UhznkZHBPzNp+wgopV i53A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:user-agent :in-reply-to:references:mime-version:content-transfer-encoding; bh=3Sn4OZCNuqgZ660IVpjXlVAaY5YjIAGnhRjqb+BCgVg=; b=PXBIOLfnxaIMwyPlIVYkkR6FhYWM7kQRMIETRmgTTN36UZLyDHByA7V4H4ws4nOX+R u0tmlbD6VJvSA6/Z9Tqbec5VcE2oXjtoZjOfmMz/6T0dOI64xGutqwn/UYVKHXzaZ023 vsV9R3kxnBwfSqjKQl9X+EZ6kF4ZHbJubTCrQV9vtMLePv2pYS/SPHzzmPwecjt7jFRi facm9Mz2hS5rwUmhbDaFu84MVzXI48mdTxPjlhn8pY/EW8MFwaHUwPXJ8v3kAZIj7+tw M7mQ/TyIHsZRESj0CiTH7B3kQuFe+IxjfT0tHPfnj0QkmtvR7wd4bYtWFyFDweJPg+PJ 3E/Q== X-Gm-Message-State: AOPr4FVcSyJ1ccoWY3hlGLdrittpgkHSsfQpundDhgEuy0ADt2dBznD156qSw5LDYTnb79xK X-Received: by 10.28.213.1 with SMTP id m1mr37516038wmg.103.1463676216439; Thu, 19 May 2016 09:43:36 -0700 (PDT) Received: from xps13.localnet (113.202.154.77.rev.sfr.net. [77.154.202.113]) by smtp.gmail.com with ESMTPSA id c7sm9825110wji.38.2016.05.19.09.43.33 (version=TLSv1/SSLv3 cipher=OTHER); Thu, 19 May 2016 09:43:35 -0700 (PDT) From: Thomas Monjalon <thomas.monjalon@6wind.com> To: Yoni Gilad <Yonig@radcom.com> Cc: dev@dpdk.org, Huawei Xie <huawei.xie@intel.com>, Yuanhan Liu <yuanhan.liu@linux.intel.com> Date: Thu, 19 May 2016 18:43:19 +0200 Message-ID: <5703424.Nz7AfLLfu1@xps13> User-Agent: KMail/4.14.10 (Linux/4.1.6-1-ARCH; KDE/4.14.11; x86_64; ; ) In-Reply-To: <DB3PR05MB4919295860E52A070C06A87D54A0@DB3PR05MB491.eurprd05.prod.outlook.com> References: <DB3PR05MB4919295860E52A070C06A87D54A0@DB3PR05MB491.eurprd05.prod.outlook.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Subject: Re: [dpdk-dev] virtio: crash when using multiple processes (16.04 regression) X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK <dev.dpdk.org> List-Unsubscribe: <http://dpdk.org/ml/options/dev>, <mailto:dev-request@dpdk.org?subject=unsubscribe> List-Archive: <http://dpdk.org/ml/archives/dev/> List-Post: <mailto:dev@dpdk.org> List-Help: <mailto:dev-request@dpdk.org?subject=help> List-Subscribe: <http://dpdk.org/ml/listinfo/dev>, <mailto:dev-request@dpdk.org?subject=subscribe> X-List-Received-Date: Thu, 19 May 2016 16:43:36 -0000 2016-05-19 16:20, Yoni Gilad: > We have encountered a crash in virtio_xmit_pkts (specifically, in the call to virtqueue_notify) when running DPDK in a multi-process setup. This is a regression in DPDK 16.04. Thanks a lot for reporting. 2 tips to improve such bug report: - Send it to the maintainer of virtio (and cc this list). You can find them in the MAINTAINERS file. I've cc'ed them. - Try to test early the release candidates to have it fixed before the bug is really released. > The culprit seems to be the field vtpci_ops in the virtio_hw structure. This field is stored in shared memory, but points to a struct in the primary process's address space. If the same struct was loaded in a different address in the secondary process, it will lead to a crash or other issues when this field is dereferenced there. The referenced virtio_pci_ops struct contains function pointers, which can also be different in the secondary process.