On 4/28/2024 6:29 AM, Manolo wrote:

Fl_Window.cxx line 595 :
  Fl_Widget* p = parent(); for (;p->visible();p = p->parent()) {}

has been unchanged since at least 30 october 2002 (22 years). So, it's surprising a null pointer derefencing popups up today. We should know exactly if the crash is caused by p being null and p->visible() being attempted. It could be that p has been deleted before which would be another kind of

error, more likely in the client program.

Now that I know where to look, I printed out the pointers with:

          if (visible()) {
              printf("FL_HIDE:\n");
            Fl_Widget* p = parent();
            for (;p->visible();p = p->parent())
            {
                printf("\t%p\n", p);
                printf("\tparent=%p\n", p->parent());
            }
            if (p->type() >= FL_WINDOW) break; // don't do the unmap
          }


FL_HIDE:
        0000016A4D2ED8B0
        parent=0000000000000000

I don't know what more proof do you want.

--
Gonzalo Garramuño
ggarra13@gmail.com

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