LabVIEW Crashes when Stopping Two Parallel Running gRPC Servers (on Windows and on NI Linux RT)

[gmkrtchy]

Hi,

We are developing a solution as part of a TBU CCS project that incorporates ni gRPC. In simple terms, we have multiple modules that will have a server setup inside the module & we will be connecting clients from teststand to be able to communicate directly with these modules. These modules will be within a overriding application and running within NI LINUX RT.

We have come across an issue whereby multiple servers is causing NI RT and also Labivew on windows to crash. We do not believe we are doing anything out of the ordinary and we are doing something similar to the TBU SRD ReplayHiLAD RT application, of whcih we can see doesn't do anything "non-standard".

As an example we created one Simple LV project consists of 2 Modules

Both Servers has the same code, after 30 seconds each server generates "Server Stop" event which stops the gRPC Loop.
I see that Module1 Server Stops properly, but during stopping Module 2 it loses the connection to the target (See screenshot below)

We are using these versions of gRPC packages

There looks to be a similar ticket already created here from a partner. Any help and advice on this topic is appreciated as this is a solution required for a key NI Customer
Please Find attached the LV Project with Protos
gRPC_MultiServer.zip

AB#2759169

[nischalks]

@gmkrtchy, we will look into this issue.

[j-medland]

This is a very rough guess and I am no C++ programmer but is it because LVProtoServerReflectionPlugin is being deleted here?

Looking at how the plugin is instantiated and stored I believe it would be shared between both server instances.

grpc-labview/src/grpc_server.cc

Line 273 in add68a6

LVProtoServerReflectionPlugin::GetInstance()->DeleteInstance();