Comment 9 for bug 972419

The I flag is set by the kernel when the filesystem is using a hash tree to store the directory index (http://en.wikipedia.org/wiki/Htree). It only happens when using an ext4 filesystem, or ext3 with the dir_index mount option set, but I believe if you continue to add new files to the tmp directory it will eventually use a hash tree to index the directory, at which point the I flag will be set and cpack will fail to create a valid debian package