when encountering dirs missing the executable bit, du used to spit out an error but continue on its way ... with the new version though, the error forces premature failure with an helpful message :(
for example, this dir structure as a non-root user:
rm -rf foo
mkdir -p foo/{a,b,c}
touch foo/a/asdf
here is coreutils-5.94:
$ du
du: `./b': Permission denied
1 ./c
1 ./a
3 .
here is coreutils-6.4:
$ du
du: fts_read failed: Permission denied
-mike
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