I think but do not know for sure: you exceeded some limit, likely the number of arguments
- in other words du is finding zillions of files. du -s gives a summary
This will work in that case:...
find / -type d | xargs du | sort -n | tail -20
This will run a while, but will show you a path for each directory, it chops off the list with the 20 largest directories. By...