Buffer invalidation in FAST - DDS

[Employeeprojec]

When i tried setting maxmessagesize equal to segmentsize in SHM transport of fast dds...
It is showing buffer invalidation warning...But i am not getting any data loss....What is buffer invalidation in fast dds...

I want to know, even if buffer invalidation is happening, why there is no data loss?

[paxifaer]

Can you show us your xml setting?

[Employeeprojec]

Can you show us your xml setting?

shm_transport SHM 134217728

<participant profile_name="SHMParticipant" is_default_profile="true">
    <rtps>
        <!-- Link the Transport Layer to the Participant -->
        <userTransports>
            <transport_id>shm_transport</transport_id>
        </userTransports>
        <useBuiltinTransports>false</useBuiltinTransports>
    </rtps>
</participant>