From @Leont

This is a bug report for perl from fawaka@​gmail.com,
generated with the help of perlbug 1.39 running under perl 5.14.1.

perl -E 'use open IO => "encoding(utf-8-strict)"; open my $fh, "<",
undef or die $!; say for PerlIO​::get_layers($fh)'

Output​:
unix
perlio
encoding(utf-8-strict)
utf8
encoding(utf-8-strict)
utf8

Flags​:
  category=core
  severity=low

Site configuration information for perl 5.14.1​:

Configured by leon at Tue Jun 28 15​:59​:52 CEST 2011.

Summary of my perl5 (revision 5 version 14 subversion 1) configuration​:

  Platform​:
  osname=linux, osvers=2.6.38-8-generic, archname=x86_64-linux
  uname='linux leon-laptop 2.6.38-8-generic #42-ubuntu smp mon apr
11 03​:31​:24 utc 2011 x86_64 x86_64 x86_64 gnulinux '
  config_args='-de -Dprefix=/home/leon/perl5/perlbrew/perls/perl-5.14.1'
  hint=recommended, useposix=true, d_sigaction=define
  useithreads=undef, usemultiplicity=undef
  useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
  use64bitint=define, use64bitall=define, uselongdouble=undef
  usemymalloc=n, bincompat5005=undef
  Compiler​:
  cc='cc', ccflags ='-fno-strict-aliasing -pipe -fstack-protector
-I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
  optimize='-O2',
  cppflags='-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
  ccversion='', gccversion='4.6.1 20110409 (prerelease)', gccosandvers=''
  intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
  d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
  ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t',
lseeksize=8
  alignbytes=8, prototype=define
  Linker and Libraries​:
  ld='cc', ldflags =' -fstack-protector -L/usr/local/lib'
  libpth=/usr/local/lib /lib /usr/lib /usr/lib/x86_64-linux-gnu
/lib64 /usr/lib64
  libs=-lnsl -ldl -lm -lcrypt -lutil -lc
  perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc
  libc=, so=so, useshrplib=false, libperl=libperl.a
  gnulibc_version='2.13'
  Dynamic Linking​:
  dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
  cccdlflags='-fPIC', lddlflags='-shared -O2 -L/usr/local/lib
-fstack-protector'

Locally applied patches​:

@​INC for perl 5.14.1​:
  /home/leon/perl5/perlbrew/perls/perl-5.14.1/lib/site_perl/5.14.1/x86_64-linux
  /home/leon/perl5/perlbrew/perls/perl-5.14.1/lib/site_perl/5.14.1
  /home/leon/perl5/perlbrew/perls/perl-5.14.1/lib/5.14.1/x86_64-linux
  /home/leon/perl5/perlbrew/perls/perl-5.14.1/lib/5.14.1
  .

Environment for perl 5.14.1​:
  HOME=/home/leon
  LANG=en_US.utf8
  LANGUAGE=en_US​:en
  LD_LIBRARY_PATH (unset)
  LOGDIR (unset)
  PATH=/home/leon/perl5/perlbrew/bin​:/home/leon/perl5/perlbrew/perls/perl-5.14.1/bin​:/home/leon/bin​:/usr/local/sbin​:/usr/local/bin​:/usr/sbin​:/usr/bin​:/sbin​:/bin​:/usr/games
  PERLBREW_HOME=/home/leon/.perlbrew
  PERLBREW_PATH=/home/leon/perl5/perlbrew/bin​:/home/leon/perl5/perlbrew/perls/perl-5.14.1/bin
  PERLBREW_PERL=perl-5.14.1
  PERLBREW_ROOT=/home/leon/perl5/perlbrew
  PERLBREW_VERSION=0.25
  PERL_BADLANG (unset)
  SHELL=/bin/bash

This issue is a duplicate of #7896