Ubuntu 26.04/Wayland/Gtk: Resource exhaustion for message-box called in button callback

[FrankRuben]

Hi,

running the test program below on Ubuntu 26.04/Wayland/Gtk4/Gnome50/Racket 9.1 and selecting "Quit", the message-box is not displayed, instead I'm getting spinning fans for a few seconds, then the program ends with "Gdk-Message: 14:15:24.255: Error flushing display: Resource temporarily unavailable" (original text for the second part in German: "Die Ressource ist zur Zeit nicht verfügbar").

The program runs just fine on Windows, both with Racket 9.0 and Racket 9.1.

I hope the information is good enough to reproduce the issue.

Thanks for the great racket/gui package :)

Best regards, Frank

#lang racket

(require racket/gui)

(define frame
  (new frame% [label "Quit example"] [width 300] [height 100]))

(define quit-button
  (new button% [parent frame] [label "Quit"]
       [callback
        (lambda (_button _event)
          (when (eq? (message-box "Quit" "Do you really want to quit?"
                                  frame '(yes-no)) 'yes)
            (send frame show #f)
            (exit 0)))]))

(send frame show #t)

[samth]

On wayland on Ubuntu 25.10 I see normal behavior from this program.

[soegaard]

@FrankRuben

Can we persuade you to download "almost 9.2" and give it go?
Go here: https://download.racket-lang.org/
Then click "Snapshot Builds" at the lower right.

I know, there were a Wayland related change after 9.1 came out,
but I don't know the details.

[FrankRuben]

Thanks for your support - and sure, you could :)

Result is sadly nearly the same: fan starts spinning, but program won't abort on its own.
Pressing Ctrl-C twice shows the stack trace given below:

$ bin/racket --version
Welcome to Racket v9.2.0.5-2026-05-26-6917300ab7 [cs].

$ bin/racket XXX/test-rkt-frame-with-confirmed-quit.rkt
^Cuser break
  context...:
   YYY/racket-9.2.0.5/share/pkgs/gui-lib/mred/private/wx/common/dialog.rkt:58:4: show method in ...wx/common/dialog.rkt:11:2
   YYY/racket-9.2.0.5/collects/racket/private/more-scheme.rkt:145:2: call-with-break-parameterization
   YYY/racket-9.2.0.5/collects/racket/private/more-scheme.rkt:263:2: call-with-exception-handler
   YYY/racket-9.2.0.5/share/pkgs/gui-lib/mred/private/messagebox.rkt:77:6: show-and-return-results method in message-box/custom-dialog%
   YYY/racket-9.2.0.5/share/pkgs/gui-lib/mred/private/messagebox.rkt:302:2: do-message-box
   /home/frank/Dropbox/src/scheme-src/rkt-src/test-rkt-frame-with-confirmed-quit.rkt:12:8
   YYY/racket-9.2.0.5/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:436:6
   YYY/racket-9.2.0.5/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:487:32
   YYY/racket-9.2.0.5/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:639:3
^Cuser break
  context...:
   YYY/racket-9.2.0.5/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:639:3