netdev - [Kernel 5.10.201] USGv6 conformance test issue

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Date: Tue, 6 Feb 2024 14:50:26 +0530
From: mahendra <mahendra.sp1812@...il.com>
To: netdev@...r.kernel.org
Subject: [Kernel 5.10.201] USGv6 conformance test issue

Hi Everyone,

We are executing IPv6 Ready Core Protocols Test Specification for
Linux kernel 5.10.201 for USGv6 certification.

Under Test v6LC.2.2.23: Processing Router Advertisement with Route
Information Option (Host Only) , there are multiple tests from A to J
category. We are facing issue with test category F which is described
as below.

Part F: PRF change in Route Information Option.
 Here is what is happening:

Router Advertisement sent from router A with PRF low.
Router Advertisement sent from router B with PRF medium.
Echo Request.
Echo Reply expected to be directed to router B. However, reply is sent
to router A
Router Advertisement sent from router A with PRF high.
Echo Request.
Echo Reply expected to be directed to router A. However,  reply is
sent to router B

We tried introducing delay in the test case between each request to
allow processing to complete. This did not help.

Has anyone observed this behavior? is there a patch for this issue ?
Please suggest on how to go about finding solution for this failure.
If I need to post this to other linux network users forums as well,
please let me know.

Thanks
Mahendra