JSON C library is not work in RTOS.

Hello,

I am working on json-c and cJSON library in stm32cubeide and it works fine without RTOS. But when I switch to RTOS , both library not working. They are showing different error.

json-c :- when I call "json_object_object_add" function, then program stuck in while of _exit Status in syscall.c.

cJSON :- It is not stuck anywhere but it could not create any object. It showing null object.

Can anyone help me?