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{
    "id": 13145,
    "url": "http://patches.dpdk.org/api/patches/13145/?format=api",
    "web_url": "http://patches.dpdk.org/project/dpdk/patch/1464792717-17171-1-git-send-email-anatoly.burakov@intel.com/",
    "project": {
        "id": 1,
        "url": "http://patches.dpdk.org/api/projects/1/?format=api",
        "name": "DPDK",
        "link_name": "dpdk",
        "list_id": "dev.dpdk.org",
        "list_email": "dev@dpdk.org",
        "web_url": "http://core.dpdk.org",
        "scm_url": "git://dpdk.org/dpdk",
        "webscm_url": "http://git.dpdk.org/dpdk",
        "list_archive_url": "https://inbox.dpdk.org/dev",
        "list_archive_url_format": "https://inbox.dpdk.org/dev/{}",
        "commit_url_format": ""
    },
    "msgid": "<1464792717-17171-1-git-send-email-anatoly.burakov@intel.com>",
    "list_archive_url": "https://inbox.dpdk.org/dev/1464792717-17171-1-git-send-email-anatoly.burakov@intel.com",
    "date": "2016-06-01T14:51:57",
    "name": "[dpdk-dev] ivshmem: document a potential segmentation fault in rte_ring",
    "commit_ref": null,
    "pull_url": null,
    "state": "accepted",
    "archived": true,
    "hash": "dd93cb955e4618c268664683b6ecd0b252dafc08",
    "submitter": {
        "id": 4,
        "url": "http://patches.dpdk.org/api/people/4/?format=api",
        "name": "Burakov, Anatoly",
        "email": "anatoly.burakov@intel.com"
    },
    "delegate": {
        "id": 1,
        "url": "http://patches.dpdk.org/api/users/1/?format=api",
        "username": "tmonjalo",
        "first_name": "Thomas",
        "last_name": "Monjalon",
        "email": "thomas@monjalon.net"
    },
    "mbox": "http://patches.dpdk.org/project/dpdk/patch/1464792717-17171-1-git-send-email-anatoly.burakov@intel.com/mbox/",
    "series": [],
    "comments": "http://patches.dpdk.org/api/patches/13145/comments/",
    "check": "pending",
    "checks": "http://patches.dpdk.org/api/patches/13145/checks/",
    "tags": {},
    "related": [],
    "headers": {
        "Return-Path": "<dev-bounces@dpdk.org>",
        "X-Original-To": "patchwork@dpdk.org",
        "Delivered-To": "patchwork@dpdk.org",
        "Received": [
            "from [92.243.14.124] (localhost [IPv6:::1])\n\tby dpdk.org (Postfix) with ESMTP id A58B9591F;\n\tWed,  1 Jun 2016 16:52:04 +0200 (CEST)",
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            "from sivswdev02.ir.intel.com (sivswdev02.ir.intel.com\n\t[10.237.217.46])\n\tby irvmail001.ir.intel.com (8.14.3/8.13.6/MailSET/Hub) with ESMTP id\n\tu51Epve3025663; Wed, 1 Jun 2016 15:51:57 +0100",
            "from sivswdev02.ir.intel.com (localhost [127.0.0.1])\n\tby sivswdev02.ir.intel.com with ESMTP id u51EpvYB017208;\n\tWed, 1 Jun 2016 15:51:57 +0100",
            "(from aburakov@localhost)\n\tby sivswdev02.ir.intel.com with  id u51Epv4t017204;\n\tWed, 1 Jun 2016 15:51:57 +0100"
        ],
        "X-ExtLoop1": "1",
        "X-IronPort-AV": "E=Sophos;i=\"5.26,401,1459839600\"; d=\"scan'208\";a=\"819401471\"",
        "From": "Anatoly Burakov <anatoly.burakov@intel.com>",
        "To": "dev@dpdk.org",
        "Cc": "ferruh.yigit@intel.com",
        "Date": "Wed,  1 Jun 2016 15:51:57 +0100",
        "Message-Id": "<1464792717-17171-1-git-send-email-anatoly.burakov@intel.com>",
        "X-Mailer": "git-send-email 1.7.4.1",
        "Subject": "[dpdk-dev] [PATCH] ivshmem: document a potential segmentation fault\n\tin rte_ring",
        "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>,\n\t<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>,\n\t<mailto:dev-request@dpdk.org?subject=subscribe>",
        "Errors-To": "dev-bounces@dpdk.org",
        "Sender": "\"dev\" <dev-bounces@dpdk.org>"
    },
    "content": "Commit 4768c475 added a pointer to the memzone in rte_ring. However,\nall memzones are residing in local mem_config, therefore accessing\nthe memzone pointer inside the guest in an IVSHMEM-shared rte_ring\nwill cause segmentation fault. This issue is unlikely to ever get\nfixed, as this would require lots of changes for very little benefit,\ntherefore we're documenting this limitation instead.\n\nSigned-off-by: Anatoly Burakov <anatoly.burakov@intel.com>\n---\n doc/guides/prog_guide/ivshmem_lib.rst | 2 ++\n 1 file changed, 2 insertions(+)",
    "diff": "diff --git a/doc/guides/prog_guide/ivshmem_lib.rst b/doc/guides/prog_guide/ivshmem_lib.rst\nindex 9401ccf..b8a32e4 100644\n--- a/doc/guides/prog_guide/ivshmem_lib.rst\n+++ b/doc/guides/prog_guide/ivshmem_lib.rst\n@@ -79,6 +79,8 @@ The following is a simple guide to using the IVSHMEM Library API:\n     Only data structures fully residing in DPDK hugepage memory work correctly.\n     Supported data structures created by malloc(), mmap()\n     or otherwise using non-DPDK memory cause undefined behavior and even a segmentation fault.\n+    Specifically, because the memzone field in an rte_ring refers to a memzone structure residing in local memory,\n+    accessing the memzone field in a shared rte_ring will cause an immediate segmentation fault.\n \n IVSHMEM Environment Configuration\n ---------------------------------\n",
    "prefixes": [
        "dpdk-dev"
    ]
}