Strange leak detected with TClientDataSet

[Mozzg]

Hello.

I've encountered strange leak, while using FastMM5. I'm using RAD Studio 11.3 Patch 1.
Steps to reproduce:

1. Create new Vcl application.
2. Add TClientDataSet to created form.
3. Enter fields editor in TClientDataSet, add an Integer field with any name.
4. RMB on ClientDataSet and click "Create DataSet".
5. In project settings add conditional defines FastMM_EnableMemoryLeakReporting and FastMM_ShareMM.
6. Run and close the application.

After this steps you will have 10 memory leaks of type Unknown.
I've tried to inspect call stack for memory allocations, but it seemed corrupted. I was using debug library recompiled with madExcept at first, later I used precompiled debug library but in both cases call stacks didn't make much sense.
I reproduced this leak in 2 different work applications and in new application. Maybe I'm using defines wrong, but for me the setup looks like a normal work environment. Define FastMM_ShareMM and creating or loading local data to TClientDataSet together seem to trigger this leak. Clearing local data in ClientDataSet removes the leaks.
Also I've tried reproducing this with FastMM4, but couldn't. Seems like it is exclusive to FastMM5.

Am I doing something wrong? Is it a bug somewhere? Can anyone reproduce it?

[pleriche]

I can reproduce it with FastMM4, FastMM5 and also the built-in memory manager (add System.SimpleShareMem to the project's DPR file to see it happen with the latter.)

Comparing the addresses in the leak stack trace:
7748A7BC
77488D81
77482215
7747AC69
7747AC73
7747B61D

...to the list of loaded DLLs, it looks like the leak is in midas.dll:

This should be fixed by Embarcadero - I suggest you file a bug report at qp.embarcadero.com.

[Mozzg]

Thank you for reply.

I've tried to reproduce a leak with FastMM4 and built-in memory manager again and was successful. I was probably using wrong settings/units before.
Also I've tried to include MidasLib unit, to include midas binary inside an application and the leak is gone. I use TClientDataSet a lot at work, probably this will be a solution.