Das kommt im osm2pgsql.log an.
WARNING: terminating connection because of crash of another server process
DETAIL: The postmaster has commanded this server process to roll back the current transaction and exit, because another server process exited abnormally and possibly corrupted shared memory.
HINT: In a moment you should be able to reconnect to the database and repeat your command.
CONTEXT: COPY planet_polygon, line 1: "20467321 \N \N \N \N \N \N \N university \N \N \N \N \N \N \N \N \N \N \N \N \N \N \N \N \N \N \N \N..."
COPY_END for planet_polygon failed: SSL SYSCALL error: EOF detected
Error occurred, cleaning up
in der planet_polygon war die Id dann aber nicht vorhanden.
Vorschläge zur Fehlerbeseitigung werden sehr gerne von mir gelesen 
Grüße
Dietmar