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[perl #20771] Regular Expression Eval Causes Core Dump

From:
Steve Johnson
Date:
February 6, 2003 14:39
Subject:
[perl #20771] Regular Expression Eval Causes Core Dump
Message ID:
rt-20771-50495.9.53837783522388@bugs6.perl.org
# New Ticket Created by  "Steve Johnson" 
# Please include the string:  [perl #20771]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt2/Ticket/Display.html?id=20771 >


This is a bug report for perl from slj@equilibrium.com,

generated with the help of perlbug 1.34 running under perl v5.8.0.

 

 

-----------------------------------------------------------------

I can reliably reproduce a core dump in a regular expression eval.

 

I've seen this a number of times, working around it each time by

changing either the data I'm matching or the expression itself.

I just upgraded to 5.8, hoping this would be solved there.  I've had

this problem with a number of 5.6 versions as well as 5.8.  I've also

had the problem on a number of machines and cygwin lib versions.

 

Below is a script that exhibits the problem.  This script should output:

 

   TOP

   BOTTOM

 

but it only prints TOP because it core dumps before the bottom of

the script.

 

If you make the "stuff" shorter by removing some lines from the middle

of it, the script will run to completion.  I believe that it always 

crashes on the first execution thru the loop.

 

#!/usr/local/bin/perl

 

print "TOP\n";

 

$buf = getStuff();

 

while (1)

{

            if ($buf =~ /^\s*([^:\n\r]+):[ \t]+([^;\n\r]+)([\n\r]+|;)/s)

            {

                        $buf = $POSTMATCH;

            }

            elsif ($buf =~ /^\s*([^:\n\r]+):[\n\r]+(([ \t]+[^:\n\r]+:[
\t]+[^\n\r]+[\n\r]+)*)/s)

            {

                        $buf = $POSTMATCH;

            }

            else

            {

                        last;

            }

}

            

print "BOTTOM\n";

 

sub getStuff

{

            return <<END;

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            Freeride_Ent_171_2: 1.13

            Magick_121_2: 1.13

            Jpeg_20_2: 1.13

            IISFilter_106_2: 1.13

            Gif_147_2: 1.13

            GhostReader_111_2: 1.13

            FSNet_148_2: 1.13

            FlashPix_146_2: 1.13

            Database_106_2: 1.13

            BUILD_176_1: 1.13

            XmlParser_106_1: 1.13

            WBMP_147_1: 1.13

            Tiff_149_1: 1.13

            TextGdi_125_1: 1.13

            SWFlash_109_1: 1.13

            PSPlugin_146_1: 1.13

            PSPlugin_146_1: 1.13

            PreloadOdbc_120_1: 1.13

            Pipe_163_1: 1.13

            Photoshop_158_1: 1.13

            MGenClient_106_1: 1.13

            MediaScript_151_1: 1.13

END

}

 

 

 

 

[Please do not change anything below this line]

-----------------------------------------------------------------

---

Flags:

    category=core

    severity=high

---

Site configuration information for perl v5.8.0:

 

Configured by Administrator at Wed Jul 24 18:20:25  2002.

 

Summary of my perl5 (revision 5.0 version 8 subversion 0) configuration:

  Platform:

    osname=cygwin, osvers=1.3.12(0.5432), archname=cygwin-multi-64int

    uname='cygwin_nt-5.0 kmbestst 1.3.12(0.5432) 2002-07-06 02:16 i686
unknown '

    config_args='-de -Dmksymlinks -Dusemultiplicity -Duse64bitint
-Doptimize=-O2 -Dman3ext=3pm'

    hint=recommended, useposix=true, d_sigaction=define

    usethreads=undef use5005threads=undef useithreads=undef
usemultiplicity=define

    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef

    use64bitint=define use64bitall=undef uselongdouble=undef

    usemymalloc=y, bincompat5005=undef

  Compiler:

    cc='gcc', ccflags ='-DPERL_USE_SAFE_PUTENV -fno-strict-aliasing',

    optimize='-O2',

    cppflags='-DPERL_USE_SAFE_PUTENV -fno-strict-aliasing'

    ccversion='', gccversion='3.1.1 20020718 (prerelease)',
gccosandvers=''

    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=12345678

    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12

    ivtype='long long', ivsize=8, nvtype='double', nvsize=8,
Off_t='off_t', lseeksize=4

    alignbytes=8, prototype=define

  Linker and Libraries:

    ld='ld2', ldflags =' -s -L/usr/local/lib'

    libpth=/usr/local/lib /usr/lib /lib

    libs=-lgdbm -lcrypt -lutil

    perllibs=-lcrypt -lutil

    libc=/usr/lib/libc.a, so=dll, useshrplib=true, libperl=libperl.a

    gnulibc_version=''

  Dynamic Linking:

    dlsrc=dl_dlopen.xs, dlext=dll, d_dlsymun=undef, ccdlflags=' -s'

    cccdlflags=' ', lddlflags=' -s -L/usr/local/lib'

 

Locally applied patches:

    

 

---

@INC for perl v5.8.0:

    /usr/lib/perl5/5.8.0/cygwin-multi-64int

    /usr/lib/perl5/5.8.0

    /usr/lib/perl5/site_perl/5.8.0/cygwin-multi-64int

    /usr/lib/perl5/site_perl/5.8.0

    /usr/lib/perl5/site_perl

    .

 

---

Environment for perl v5.8.0:

    HOME=/home/sjohnson

    LANG (unset)

    LANGUAGE (unset)

    LD_LIBRARY_PATH (unset)

    LOGDIR (unset)

 
PATH=.:/home/sjohnson/bin:/c/WINDOWS:/eq/Tools/win386/bin:/eq/Tools/comm
on/bin:.:/usr/local/bin:/usr/bin:/bin:/c/WINDOWS/system32:/c/WINDOWS:/c/
WINDOWS/System32/Wbem:/eq/Devel/Build/Bin:/eq/Devel/Test/Bin

    PERL_BADLANG (unset)

    SHELL (unset)

 






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