Ubuntu 25.10: DrRacket internal error when opening toolbar

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Domain
desktop, operating-systems

Research direction

Reproduce the error by opening the DrRacket toolbar on Ubuntu 25.10 and inspect the stack-trace locations in gui-lib/mred/private/lock.rkt and drracket-core-lib/drracket/private/syncheck/gui.rkt. Determine why the toolbar path passes -8388608 to screen->client; done means opening the toolbar without the contract violation across the reported installation methods.

Written by the indexing model from the issue text.

Description

As the title says, when I click on the DrRacket toolbar following internal error is displayed in a small window:

screen->client in window<%>: contract violation
  expected: (integer-in -1000000 1000000)
  given: -8388608
  context...:
   /snap/racket/current/usr/share/racket/pkgs/gui-lib/mred/private/lock.rkt:43:38
   /snap/racket/current/usr/share/racket/collects/racket/private/more-scheme.rkt:266:2: call-with-exception-handler
   /snap/racket/current/usr/share/racket/pkgs/drracket-core-lib/drracket/private/syncheck/gui.rkt:1462:12: syncheck:update-drawn-arrows method in ...ate/syncheck/gui.rkt:405:10
   /snap/racket/current/usr/share/racket/pkgs/drracket-core-lib/drracket/private/syncheck/gui.rkt:2181:8: on-activate method in unit-frame-mixin
   /snap/racket/current/usr/share/racket/pkgs/gui-lib/mred/private/wx/common/queue.rkt:436:6
   /snap/racket/current/usr/share/racket/pkgs/gui-lib/mred/private/wx/common/queue.rkt:487:32
   /snap/racket/current/usr/share/racket/pkgs/gui-lib/mred/private/wx/common/queue.rkt:639:3

The error gets displayed regardles of installation method (.sh file, apt, snap, flatpak).
When I open drracket from terminal I get the info:

Not loading module "atk-bridge": The functionality is provided by GTK natively. Please try to not load it.

Following solutions I failed:

  • Deactivating background expansion in preferences
  • GTK_CSD=0 drracket or GTK_CSD="" drracket
  • GDK_BACKEND=x11 drracket
Dominant language
Racket
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