Hi,
I ran into this issue where I signals threads in my application and got a crash because custom_data is NULL for my thread.
I then ran the test cmsis_v1 related to signals and it went fine until I modified it to signal the thread 1 from the main thread... the thread 1 crashes when it waits in
Please note that the use case seems ok if I build manually a osThreadDef_t for the main thread and assigns it to its custom_data as well as assign each thread its own thread def to its custom_data.