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From: "Zhang, Qi Z" <qi.z.zhang@intel.com>
To: "Ye, MingjinX" <mingjinx.ye@intel.com>, "dev@dpdk.org" <dev@dpdk.org>
CC: "Yang, Qiming" <qiming.yang@intel.com>, "stable@dpdk.org"
 <stable@dpdk.org>, "Zhou, YidingX" <yidingx.zhou@intel.com>, "Ye, MingjinX"
 <mingjinx.ye@intel.com>, "Wu, Wenjun1" <wenjun1.wu@intel.com>
Subject: RE: [PATCH v2] doc: add PMD known issue
Thread-Topic: [PATCH v2] doc: add PMD known issue
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Date: Mon, 15 May 2023 05:56:47 +0000
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References: <20230420061429.140113-1-mingjinx.ye@intel.com>
 <20230506100252.215680-1-mingjinx.ye@intel.com>
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> -----Original Message-----
> From: Mingjin Ye <mingjinx.ye@intel.com>
> Sent: Saturday, May 6, 2023 6:03 PM
> To: dev@dpdk.org
> Cc: Yang, Qiming <qiming.yang@intel.com>; stable@dpdk.org; Zhou, YidingX
> <yidingx.zhou@intel.com>; Ye, MingjinX <mingjinx.ye@intel.com>; Wu,
> Wenjun1 <wenjun1.wu@intel.com>
> Subject: [PATCH v2] doc: add PMD known issue
>=20
> Add a known issue: The ixgbe_vf driver is not multi-process safe.
>=20
> Signed-off-by: Mingjin Ye <mingjinx.ye@intel.com>
> ---
> v2: Modify issue description reason.
> ---
>  doc/guides/nics/ixgbe.rst | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
>=20
> diff --git a/doc/guides/nics/ixgbe.rst b/doc/guides/nics/ixgbe.rst index
> b1d77ab7ab..9fb3c39bf4 100644
> --- a/doc/guides/nics/ixgbe.rst
> +++ b/doc/guides/nics/ixgbe.rst
> @@ -461,3 +461,18 @@ show bypass config
>  Show the bypass configuration for a bypass enabled NIC using the lowest
> port on the NIC::
>=20
>     testpmd> show bypass config (port_id)
> +
> +VF driver is not multi-process safe
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +Core dump may occur when we start secondary processes on the VF port.
> +Mainstream Linux distributions have the ASLR feature enabled by
> +default, and the text segment of the process memory space is randomized.
> +The secondary process calls the function address shared by the primary
> +process, resulting in a core dump.

Which function did we encounter the issue with? Is this a bug in the PMD? I=
n a multi-process scenario, we should not assume that the addresses of func=
tions are identical across different processes. Additionally, this issue sh=
ould not be related ASLR because the primary and secondary processes could =
be two different applications but still share the same DPDK library.

> +
> +   .. Note::
> +
> +          Support for ASLR features varies by distribution. Redhat and
> +          Centos series distributions work fine. Ubuntu distributions
> +          will core dump, other Linux distributions are unknown.
> --
> 2.25.1