C-Caller crash with Matlab 2025a

I have many models which uses C-Callers and they work properly in accelerator mode with matlab 2024b and previous.

With Matlab 2025a almost all these models crash when I run them. "Validate custom code" runs fine, but when I run the model it crash. In normal as it should be it doesn't crash.

The issue is located into the C-caller of course, but I never had problems until R2025a.

Do you have similar issues? Any advices?

Many thanks in advanced.

D

Answer 1

[Dev]

Hi @Davide,

The issue of C-Caller models crashing in MATLAB R2025a might be sporadic since no models crashed when I try to the run the same in R2025a. Please refer to the below link for all the C-Caller Simulink example models which I execute successfully on MATLAB R2025a-

https://www.mathworks.com/help/simulink/examples.html?s_tid=CRUX_topnav&category=c_caller

Furthermore, as mentioned in the question, there might be a problem with the C-Caller used in your model which might be causing the crash. Please find the below link which provides a detailed explanation on how to specify and configure C-Caller functions-

https://in.mathworks.com/help/simulink/ug/specify-configure-custom-c-code.html

I hope the above explanation helps to solve the query.

[Davide]

Many thanks

[Davide]

Hi dev

maybe I found the issue, the problem it seems not into the C-Caller but into the "transport delay". I used it to calculate the average filter.

I checked with a very small model and transport delay works pretty nice with both 2024b/2025a in accelerator mode, but with more complex models it crasches.

It crashes with:

• simscape with local solver enabled and tc = 125e-6
• discrete time solver backward euler in global solver
• some custom ssc simscape model

• with transport delay it crashs;
• without transport delay it doesn't crash.

I try to search maybe i see something.

Thanks