Bug 503093

SUMMARY

I updated to R 4.5.0 in a Fedora 42 KDE installation with RKWard 0.8.0 installed. When I started RKWard, the Setup Assistant showed "The setup assistant has been invoked, automatically, because a problem has been detected in your setup." Another RKWard window showed "Crash recovery file detected
It looks like RKWard has crashed, recently. We are sorry about that! However, not everything is lost, and with a bit of luck, your data has been saved in time. A workspace recovery file exists, dating from 2025-4-21 Do you want to open this file, now, save it for later, or discard it?" 

I pressed Next in the Setup Assistant twice, and the error "The R backend has failed to start" was shown. Show problem details had
There was a problem starting the R backend. The following error(s) occurred:
Connection closed unexpectedly. Last error was: QLocalSocket: Remote closed
-An unspecified error occurred that is not yet handled by RKWard. Likely RKWard will not function properly. Please check your setup.

Details
R version 4.5.0 (2025-04-11) -- "How About a Twenty-Six"
Copyright (C) 2025 The R Foundation for Statistical Computing
Platform: x86_64-redhat-linux-gnu

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

Natural language support but running in an English locale

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

Error: C stack usage 46668122130540 is too close to the limit

I pressed Next in the Setup Assistant to select Attempt to restart R at /usr/bin/R. The R backend failed to start again every time I tried it. An error "R engine unavailable. See troubleshooting for possible solutions." was shown at the top of the main part of the RKWard window. I tried Settings > Check installation as in the troubleshooting instructions, but the same problem happened.

R 4.5.0 started normally by itself when I ran it in Konsole.

STEPS TO REPRODUCE
1. In a Fedora 42 KDE installation with R and rkward installed, update to R-4.5.0-3.fc42.x86_64 and rkward-0.8.0-4.fc42.x86_64 https://bodhi.fedoraproject.org/updates/FEDORA-2025-5613b8bce9 which I did with the updates-testing repository enabled
sudo dnf offline-upgrade download --refresh
sudo dnf offline-upgrade reboot

2. On the next boot after the update, log in to Plasma on Wayland
3. Run rkward

OBSERVED RESULT
The R 4.5.0 backend didn't start in RKWard

EXPECTED RESULT
The R 4.5.0 backend would start in RKWard

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 42
KDE Plasma Version: 6.3.4
KDE Frameworks Version: 6.13.0
Qt Version: 6.9.0

ADDITIONAL INFORMATION