grtfmi.tlc FMU crashes after fmi2Reset

[patengel]

Hi,

every FMU we built with the grtfmi target shows the following problem:

• The FMU works fine until fmi2Reset is called the first time. Afterwards some of the following fmi calls crashes.
• Everything works fine if we replace fmi2Reset by fmi2FreeInstance + fmi2Instantiate.

We have tested lately with FMIKit 2.8 RC 1 and it was still not working. We have tested both Matlab 2018b and 2019b. All FMIKit settings are unchanged, therefore default.

Up to my analysis the problem are dangling pointers:

• The ModelInstance struct contains fields "modelVariables", which contain references into the model itself "S".
• In fmi2Instantiate these pointers are set by initializeModelVariables(instance->S, instance->modelVariables);.
• In fmi2Reset, the model itself "S" is rebuilt, but the pointers are not reset and therefore dangling from now on.

In my opinion the problem could be fixed by calling initializeModelVariables also inside fmi2Reset.

Best,
Patrick