[perl #21940] seg fault on long input to re

# New Ticket Created by  John Bethencourt 
# Please include the string:  [perl #21940]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt2/Ticket/Display.html?id=21940 >



This is a bug report for perl from bethenco@upl.cs.wisc.edu,
generated with the help of perlbug 1.34 running under perl v5.8.0.


-----------------------------------------------------------------
Hi,

Perl segfaults on the following one liner:

perl -e '("a b a\n" x 393) =~ /([^ \n]+\s+)+/'

It consists of a single regular expression matched against a
fairly long (2358 bytes) text. Attempts to reduce the text or the
regular expression have resulted in perl no longer segfaulting.
The re does not seem particularly pathological, but I don't know
much about such things.

Thanks for all your hard work on such a useful tool.

John Bethencourt
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=medium
---
Site configuration information for perl v5.8.0:

Configured by Debian Project at Mon Feb 17 13:30:42 UTC 2003.

Summary of my perl5 (revision 5.0 version 8 subversion 0) configuration:
  Platform:
    osname=linux, osvers=2.4.19, archname=i386-linux-thread-multi
    uname='linux cyberhq 2.4.19 #1 smp sun aug 4 11:30:45 pdt 2002 i686 unknown unknown gnulinux '
    config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN -Dcccdlflags=-fPIC -Darchname=i386-linux -Dprefix=/usr -Dprivlib=/usr/share/perl/5.8.0 -Darchlib=/usr/lib/perl/5.8.0 -Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.8.0 -Dsitearch=/usr/local/lib/perl/5.8.0 -Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 -Dman1ext=1 -Dman3ext=3perl -Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Uusesfio -Uusenm -Duseshrplib -Dlibperl=libperl.so.5.8.0 -Dd_dosuid -des'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=define use5005threads=undef useithreads=define usemultiplicity=define
    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fno-strict-aliasing -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O3',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fno-strict-aliasing'
    ccversion='', gccversion='3.2.2', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lgdbm -ldb -ldl -lm -lpthread -lc -lcrypt
    perllibs=-ldl -lm -lpthread -lc -lcrypt
    libc=/lib/libc-2.3.1.so, so=so, useshrplib=true, libperl=libperl.so.5.8.0
    gnulibc_version='2.3.1'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
    cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
    

---
@INC for perl v5.8.0:
    /etc/perl
    /usr/local/lib/perl/5.8.0
    /usr/local/share/perl/5.8.0
    /usr/lib/perl5
    /usr/share/perl5
    /usr/lib/perl/5.8.0
    /usr/share/perl/5.8.0
    /usr/local/lib/site_perl
    .

---
Environment for perl v5.8.0:
    HOME=/home/bethenco
    LANG=C
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/p/condor/home/bin:/p/condor/workspaces/thain/imake/bin:/home/bethenco/bin:/bin:/usr/bin:/usr/bin/X11:/usr/local/bin:/scratch/bethenco/v65-branch/src/release_dir/bin:/scratch/bethenco/v65-branch/src/release_dir/sbin:/unsup/SSLeay/i386_rh71/bin:/home/bethenco/bin
    PERL_BADLANG (unset)
    SHELL=/bin/bash

• [perl #21940] seg fault on long input to re by John Bethencourt