arm64 CI regressions

UDD query: SELECT a.source, a.date FROM ci a JOIN ci b ON (a.source=b.source AND a.version=b.version AND a.suite=b.suite) WHERE a.arch='arm64' AND b.arch='amd64' AND a.status='fail' AND b.status='pass' AND a.message='Tests failed' AND a.suite IN ('unstable', 'testing') AND a.previous_status='pass' ORDER BY a.date DESC;