[perl #89356] recursive require calls can cause a stack overflow

# New Ticket Created by  Jesse Luehrs 
# Please include the string:  [perl #89356]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=89356 >


This is a bug report for perl from doy@tozt.net,
generated with the help of perlbug 1.39 running under perl 5.10.1.


-----------------------------------------------------------------
[Please describe your issue here]

If you put a coderef into @INC which itself calls require, perl will
eventually segfault due to a stack overflow. For instance:

  perl -e 'unshift @INC, sub { require $_[1] }; require Foo'

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=medium
---
Site configuration information for perl 5.10.1:

Configured by doy at Sun Apr 25 23:40:00 CDT 2010.

Summary of my perl5 (revision 5 version 10 subversion 1) configuration:
   
  Platform:
    osname=linux, osvers=2.6.33-arch, archname=x86_64-linux
    uname='linux zaon 2.6.33-arch #1 smp preempt sun apr 4 10:27:30 cest 2010 x86_64 intel(r) core(tm) i5 cpu m 520 @ 2.40ghz genuineintel gnulinux '
    config_args='-de -Dprefix=/home/doy/perl5/perlbrew/perls/perl-5.10.1'
    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='4.5.0', 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
    libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc
    libc=/lib/libc-2.11.1.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.11.1'
  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 5.10.1:
    /home/doy/perl5/local/
    /home/doy/perl5/local/lib/perl5/site_perl/5.10.0/i686-linux
    /home/doy/perl5/perlbrew/perls/perl-5.10.1/lib/5.10.1/x86_64-linux
    /home/doy/perl5/perlbrew/perls/perl-5.10.1/lib/5.10.1
    /home/doy/perl5/perlbrew/perls/perl-5.10.1/lib/site_perl/5.10.1/x86_64-linux
    /home/doy/perl5/perlbrew/perls/perl-5.10.1/lib/site_perl/5.10.1
    .

---
Environment for perl 5.10.1:
    HOME=/home/doy
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/doy/perl5/perlbrew/bin:/home/doy/perl5/perlbrew/perls/current/bin:/home/doy/.bin/marathon:/home/doy/.bin/nethack:/home/doy/.bin:/usr/local/sbin:/usr/local/bin:/usr/lib/ccache/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/usr/bin/core_perl
    PERL5LIB=/home/doy/perl5/local/:/home/doy/perl5/local/lib/perl5/site_perl/5.10.0/i686-linux
    PERLBREW_PATH=/home/doy/perl5/perlbrew/bin:/home/doy/perl5/perlbrew/perls/current/bin
    PERLBREW_PERL=perl-5.10.1
    PERLBREW_ROOT=/home/doy/perl5/perlbrew
    PERLBREW_VERSION=0.19
    PERL_BADLANG (unset)
    PERL_CPANM_OPT=-q --mirror file:///home/doy/perl5/minicpan/ --mirror http://mirrors.kernel.org/cpan/ --mirror http://search.cpan.org/CPAN --prompt
    SHELL=/bin/bash

• [perl #89356] recursive require calls can cause a stack overflow by Jesse Luehrs
• RE: [perl #89356] recursive require calls can cause a stack overflow by Jan Dubois