The avr-linux cross-compiler does ICE / assertion when compiling its libgcc, see the GCC upstream bug for details. Reproducible: Always
FEDORA-2025-8b8770951d (cross-gcc-15.0.1-0.1.fc42) has been submitted as an update to Fedora 42. https://bodhi.fedoraproject.org/updates/FEDORA-2025-8b8770951d
FEDORA-2025-8b8770951d (cross-gcc-15.0.1-0.1.fc42) has been pushed to the Fedora 42 stable repository. If problem still persists, please make note of it in this bug report.