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The catch option makes test run via 'catch'[1], which will log backtraces whenever an abort or segmentation fault happens in any of the subprocesses. The aim is to enable this when running in CI to help debugging crashes that only tend to happen in CI. While it's possible to wrap the whole meson command in 'catch', doing so doesn't cover the KVM tests, so this option is added instead that covers both cases. [1] https://gitlab.gnome.org/jadahl/catch/ Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2561>