It appears that the patch here:
http://git.postgresql.org/gitweb?p=postgresql.git;a=commit;h=a30fa4ca33d055c46bebc0e5c701d5b4fd27814d
missed adding PGC_S_DATABASE_USER to a few locations, most notably
GucSource_Names, where the PGC_S_SESSION now points off the end of the
array.
Patch attached.
Regards,
Jeff Davis