Subject: bug#29475: filesystem (apparently cagefs) does not allow ln to create bad symbolic link

From: Paul Eggert <[email-masked]>
Date: Thu, 30 Nov 2017 17:07:17 -0800

On 11/30/2017 04:59 PM, [email-masked] wrote:
>  From my trial and error, this file system does not let you create bad sym links.

Hmm, yes, apparently that filesystem can be configured to disallow 
creation of dangling symlinks or links to files they don't own. See:

https://www.cloudlinux.com/getting-started-with-cloudlinux-os/41-security-features/933-activating-securelink

Using this feature will break a lot of programs (not just ln), but 
evidently they're not concerned about that.