I’m trying to use the standard shared_mutex as a structure parameter but the execution keeps saying:

terminate called after throwing an instance of 'std::system_error'
  what():  Operation not permitted
Aborted

Here is the piece of code:

template <typename Object>
struct Foo
{
  ...

  void bar()
  {
     // This commented code works
     // std::shared_mutex mutex;
     // const std::unique_lock<std::shared_mutex> lock(mutex);
     const std::unique_lock<std::shared_mutex> lock2(this->mutex);
  }
  private:
    mutable std::shared_mutex mutex;
}


// this is used somewhere else within a shared_ptr:
std::share_ptr<Foo<MyObject>> foo;
foo->bar();

(I’m compiling in std c++20 with g++13)

As mentioned, the commented code works well so I exclude some environment supports issues. In addition, if I try to use a simple mutex (with no mutable) it just result to a segmentation fault. Someone can help me with that?