From the manual of curl_global_init:

This function is not thread safe. You must not call it when any other thread in the program (i.e. a thread sharing the same memory) is running. This doesn't just mean no other thread that is using libcurl. Because curl_global_init calls functions of other libraries that are similarly thread unsafe, it could conflict with any other thread that uses these other libraries.

But in storm-frontend.cpp the function is called after spawning all the threads in the thread pool.

The operations should be inverted.