From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id A0957A00E6 for ; Wed, 10 Jul 2019 23:23:11 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id C1185324D; Wed, 10 Jul 2019 23:23:10 +0200 (CEST) Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by dpdk.org (Postfix) with ESMTP id 23A662C60 for ; Wed, 10 Jul 2019 23:23:07 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 10 Jul 2019 14:23:07 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.63,476,1557212400"; d="scan'208";a="166197869" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.10]) ([10.237.221.10]) by fmsmga008.fm.intel.com with ESMTP; 10 Jul 2019 14:23:05 -0700 To: yoursunny Cc: dev@dpdk.org, Yangchao Zhou , stephen@networkplumber.org, sodey@rbbn.com References: <20190625150414.11332-1-zhouyates@gmail.com> <201907022007.x62K7LjD029770@lectura.cs.arizona.edu> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [v3] kni: fix possible kernel crash with va2pa X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 7/10/2019 9:40 PM, yoursunny wrote: > Hi Ferruh > > I've uploaded my test case to Bug 183. > You can determine whether it is a bug that should be covered by this > patch, or it should be handled separately. Thanks for clarification, your use case is about indirect mbufs, I can see why it is not working from your explanation in the bug report. I think previously when all mbufs were coming from same physically continuous memory, indirect mbufs should work. Right now I don't know how to support them. This defect fixes an issue for multi segment packages, caused by wrong address calculation for next segments. So I am for continuing with this patch, independent from indirect mbufs issue. Do you have any other issue, except than the indirect mbuf issue, if you have other KNI use cases? > > Yours, Junxiao > > On Wed, Jul 10, 2019 at 4:11 PM Ferruh Yigit wrote: >> >> On 7/2/2019 9:07 PM, Junxiao Shi wrote: >>> I am battling a related problem as reported on >>> https://bugs.dpdk.org/show_bug.cgi?id=183 and this patch seems >>> relevant, so I applied this patch on 196a46fab6eeb3ce2039e3bcaca80f8ba43ffc8d >>> >>> However, this patch does not work for me: >>> with CONFIG_RTE_LIBRTE_MBUF_DEBUG enabled, kni_free_mbufs's invocation of >>> rte_pktmbuf_free throws "bad mbuf pool" error. >>> >>> While all mbufs and segments in kni->rx_q now have physical addresses, >>> the mbufs and segments placed back to kni->free_q still have (mis-)calculated >>> virtual address. The pa2va function is not working properly. >>> >>> Consequently, userspace side is passing wrong pointer to rte_pktmbuf_free, >>> so that application crashes with CONFIG_RTE_LIBRTE_MBUF_DEBUG enabled. >>> >> >> Hi Junxiao, >> >> I don't see any issue in the code, and as far as I tested not seeing any issue. >> >> Can you please provide more information how to reproduce the issue, is it only >> enabling "CONFIG_RTE_LIBRTE_MBUF_DEBUG" config? >> >> Thanks, >> ferruh