GNU Emacs 25.2.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.22.16)
of 2017-08-09
To reproduce, you'll need to add eshell-tramp module to configuration. Add the following form to your Emacs configuration file:
(eval-after-load 'esh-module
'(add-to-list 'eshell-modules-list 'eshell-tramp))
Then, M-x eshell.
$ which sudo
eshell/sudo is a compiled Lisp function in ‘em-tramp.el’
$ sudo sleep 10
Now, if you try to leave interrupt `sleep` using C-c, it won't work.