Because UNetDriver::ProcessRemoteFunction does not check if the actor has been torn off, it's possible for the server to send a RPC for a torn off actor if it still exists on the server and client. In this case, UNetDriver::InternalProcessRemoteFunctionPrivate will create a new channel for the actor, and then UNetDriver::ProcessRemoteFunctionForChannelPrivate will perform the "initial" replication to open the channel (by calling UActorChannel::ReplicateActor). This also results in the client receiving any replicated properties that have changed since being torn off, as well as changing the torn off actor's role from ROLE_Authority on the client.
On the server, tear off a replicated actor.
After a delay (confirming that the actor has called TornOff and its role on the client is now ROLE_Authority), call a RPC on this actor. This RPC can be reliable or unreliable, multicast or client (if the torn off actor was owned by the client's connection).
Expected: The RPC will be dropped, since the actor is no longer replicated.
Actual: The RPC will be sent to the client, re-opening the actor's channel before closing it again due to being torn off.
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-184196 in the post.
| 1 |
| Component | UE - Networking |
|---|---|
| Affects Versions | 5.2 |
| Target Fix | 5.3 |
| Fix Commit | 25223732 |
|---|---|
| Main Commit | 25225474 |
| Created | Apr 25, 2023 |
|---|---|
| Resolved | Apr 27, 2023 |
| Updated | Aug 29, 2023 |