I think there is a bug in the file " src/cpu/x86/pae/pgtbl.c" the pg_table struct should be
struct pg_table { struct pde pd[2048]; struct pde pdp[4]; } __attribute__ ((packed));
instead of struct pg_table { struct pde pd[2048]; struct pde pdp[512]; } __attribute__ ((packed));
Thx - Baski