I want to report a bug, as suggested by the message I got 

(see screen shot attached).

Ubuntu : 14.04.2.LTS, running into as Virtual Machine
[ under Parallels Desktop Version 10.3.0 (29227) ] into a Mac.

(see full description hereto below)

The file I am tailing is a {log output } of a [ wget -m ] command.

Should you need more information, please let me know.

From Paris, with Love !

Hamed