Circular reference where a link is pointing back onto itself.

You can use find to find out circular reference:

$ cd /suspected/directory
$ find -L ./ -mindepth 18

$ cd /usr/bin/
[email protected]:/usr/bin$ find -L ./ -mindepth 18
find: ‘./eclipse’: Too many levels of symbolic links
find: File system loop detected; ‘./X11’ is part of the same file system loop as ‘./’.

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