This might be a duplicate of (or related to) bug 567269.

In Vala 0.11.7, if I initialize a member variable in its declaration and pass it to the base constructor, the program will segfault:

class Foo : Object {
}

class Base : Object {
    private Foo f;
    
    public Base(Foo f) {
        this.f = f;
    }
}

class Child : Base {
    private Foo child_f = new Foo();
    
    public Child() {
        // segfault here
        base (child_f);
    }
}

void main() {
    Child c = new Child();
    c = null;
}

The segfault occurs because self is being deref'ed before being allocated in child_construct():

    Child * self = NULL;
    self = (Child*) base_construct (object_type, self->priv->child_f);