Add a debug print for a weird failure
Add a debug print for a weird failure

https://ci.inria.fr/cado/job/coverage-debian-testing-amd64/274/

mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs