In the last episode (Sep 21), Marcus Comstedt (ACROSS) (Hail Ilpalazzo!) @ Pike (-) developers forum said:
Seems like Gdbm refuses to create databases on NFS disks. (BerkeleyDB has the same quirk.) Perhaps the testsuite should try creating the database in /tmp instead?
If it tries to open a file with the O_CREAT|O_EXCL flags, the client is running rpc.lockd, and the server isn't, the open might (will?) fail.