Unexpected infinite loop with xclip

[Michaël Cadilhac <michael@xxxxxxxxxxxxx>]

Hello Workers,

I can't explain the behavior of the following on my system:

With zsh -f:

$ while :; do read; echo | xclip; echo loop; done
RET
loop
loop
loop
...

(In the above, RET is the only user input.)

Bash does not have this problem.  This is independent from the
terminal I use, it even has the same behavior on a X11-free TTY (with
DISPLAY set correctly).  I'd find it strange that it be xclip related,
but could not find any other program that caused this.

Bug, feature, PEBKAC?

Cheers,
Michaël