Not maintaining a reference to Objects causes errors about cl-gtk4 HOT 3 CLOSED

Looks like that was indeed the issue. Worth noting that to get it working, I had to manually clone the latest version - updating the quicklisp and uptralisp dists did not fix the issue on its own. From this I conclude it is likely that the version of cl-gobject-introspection on quicklisp is outdated.

Happy to close the issue if you want.

from cl-gtk4.

I've done some more investigation, and it seems that similar errors can occur even if the object created is not used in anything. I'm unsure if this is related or a separate issue, so I'm adding it in the comments here instead of editing the original issue.

Below is a modified version of the start function which creates a shortcut that is then unused (and hence can be gc'd).

(defun start (app)
  (let ((window (gtk4:make-application-window :application app))
        (unused-shortcut
          (gtk4:make-shortcut
           :trigger (gtk4:shortcut-trigger-parse-string :string "<Ctrl>C")
           :action (gtk4:shortcut-action-parse-string :string "action(window.do_stuff)"))))

    (format t "shortcut: ~A~%" unused-shortcut)
    (setf (gtk4:window-title window) "Test")
    (setf *window* window)

    (unless (gtk4:widget-visible-p window)
      (gtk4:window-present window))))

Running the script with this modification with this modification resulted in the following output:

shortcut: #<OBJECT-INSTANCE {1004746613}>
CORRUPTION WARNING in SBCL pid 23868 tid 23869:
Memory fault at 0x100000001 (pc=0x7f47e15fcf61, fp=0x55979c866ba8, sp=0x7f47e184e768) tid 23869
The integrity of this image is possibly compromised.
Continuing with fingers crossed.
WARNING:
   Error calling finalizer #<FUNCTION (LAMBDA ()
                                        :IN
                                        GIR::OBJECT-SETUP-GC) {10047B092B}>:
  #<SB-SYS:MEMORY-FAULT-ERROR {10013B8273}>

from cl-gtk4.

I'm sorry I'm unable to reproduce the issue you mentioned, but based on my experience, the documentation for the Widget.add_controller parameter in GTK4 is as follows:

The instance takes ownership of the data, and is responsible for freeing it.

I suspect that you may be using an older version of cl-gobject-introspection that does not handle object ownership correctly, which can result in some memory issues. Could you please update all the libraries to their latest versions and try again?

from cl-gtk4.