LabVIEW 2025Q3 .NET core memory leak!

[Cloedu72]

I have discovered that LabVIEW 2025Q3 has a .NET memory leak. It doesn't matter which method you call from any class, a few kilobytes are lost every time. When large amounts of data are transferred during the method call, it happens faster, but the underlying problem remains.

I tried explicitly calling the garbage collector in .NET, but that didn't help. Within a few minutes, the memory in LV2025Q3 32-bit fills up and an error message (Memory full) appears.
=> Memory leak of approximately 4.2 kB per call (current example)

I borrowed the example from a forum member who demonstrates the problem using a very simple example. (https://forums.ni.com/t5/LabVIEW/net-8-labview-2025/m-p/4433787)

a few minutes later.....

Is there a workaround, or will NI consider this a bug?
=> I did not observe the same behaviour with .NET Framework....

Claude

[Cloedu72]

Any ideas or similar experiences? It seems as if no one is using .NET Core?

[Yamaeda]

What happens if you send the .NET reference through a shift register? I had a similar experience with an ActiveX program where too many calls caused a crash. In that case reusing the reference reduced the issues.

[Cloedu72]

Yes, that leads to the same problem. I have tried almost everything in the real application. This is just a simple demonstrator that is reduced to the essentials.

[jyoung8711]

I think this is pretty concerning. 4 kB per call could definitely add up quickly.

[Cloedu72]

I have also submitted a service request to NI. NI is currently working on this issue and the support has now forwarded it to R&D. Hopefully, the fix will be added in Patch3!