iconv can not process long stream

[Vladimir]

Iconv eats too much memory on large piped input.
Steps to reproduce
yes | iconv -f ascii -t utf-8 | head -n5
Expected: 5 lines of y
Observed: iconv tries to read its stdin to the very end (infinitely) until got killed by OOM Killer.
Suggested solution: apply the patch https://sourceware.org/legacy-ml/libc-alpha/2015-08/msg00297.html

$ lsb_release -rd
Description: Ubuntu 20.04.5 LTS
Release: 20.04

$ iconv -V
iconv (Ubuntu GLIBC 2.31-0ubuntu9.14) 2.31
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Written by Ulrich Drepper.

$ apt-cache policy libc-bin
libc-bin:
  Installed: 2.31-0ubuntu9.14
  Candidate: 2.31-0ubuntu9.14