On debian testing running on core i7 + 16 GB RAM, upgrading 10.5.rc0 to 10.5.rc1 and running ptestlong gives the two peranent failures :
---------------------------------------------------------------------- sage -t --long --warn-long 30.0 --random-seed=182406071428838008816328813274856162583 src/sage/graphs/graph_latex.py # 1 doctest failed sage -t --long --warn-long 30.0 --random-seed=182406071428838008816328813274856162583 src/sage/rings/real_mpfr.pyx # 1 doctest failed ----------------------------------------------------------------------already reported for a few releases…
HTH,