[Octave-bug-tracker] [bug #57245] "clear all" generates segfault if run before or after a plot

[Carlo de Falco]

Follow-up Comment #32, bug #57245 (project octave):

[comment #28 comment #28:]
> Could you please try if you still see the error with the attached patch
(with little hope it will fix anything)?
> 
> (file #48060)


Here's the result of running with your patch applied :


frame #0: 0x000000010ba2d89b
liboctinterp.7.dylib`octave::graphics_toolkit::initialize(this=0x00007ffee4f33e90,
go=0x00007ffee4f33f18) at graphics-toolkit.h:252:21
   249      // Notifies graphics toolkit that new object was created.
   250      bool initialize (const graphics_object& go)
   251      {
-> 252        return m_rep->initialize (go);
   253      }
   254  
   255      bool initialize (const graphics_handle& h)
(lldb) up
frame #1: 0x000000010b9d178d
liboctinterp.7.dylib`base_graphics_object::initialize(this=0x00007fa93386da00,
go=0x00007ffee4f33f18) at graphics.h:2886:27
   2883     if (! toolkit_flag)
   2884       {
   2885         octave::graphics_toolkit tk = get_toolkit ();
-> 2886         toolkit_flag = tk.initialize (go);
   2887       }
   2888   }
   2889 
(lldb) down
frame #0: 0x000000010ba2d89b
liboctinterp.7.dylib`octave::graphics_toolkit::initialize(this=0x00007ffee4f33e90,
go=0x00007ffee4f33f18) at graphics-toolkit.h:252:21
   249      // Notifies graphics toolkit that new object was created.
   250      bool initialize (const graphics_object& go)
   251      {
-> 252        return m_rep->initialize (go);
   253      }
   254  
   255      bool initialize (const graphics_handle& h)
(lldb) p m_rep
(std::__1::shared_ptr<octave::base_graphics_toolkit>) $0 =
std::__1::shared_ptr<octave::base_graphics_toolkit>::element_type @
0x00007fa9358d1d20 strong=3 weak=1 {
  __ptr_ = 0x00007fa9358d1d20
}
(lldb) p go
(const graphics_object) $1 = {
  rep = std::__1::shared_ptr<base_graphics_object>::element_type @
0x00007fa93386da00 strong=2 weak=1 {
    __ptr_ = 0x00007fa93386da00
  }
}


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