From Nikolaus@rath.org

Created by Nikolaus@rath.org

Hi!

The following perl-file produces a segfault as soon as the last line of
code has been executed. I removed as much stuff as possible, removing
anything more makes the segfault disappear.

----------snip------------
#!/usr/bin/perl

use strict;
use warnings;
use Date​::Parse;
use IO​::File;
use XML​::Writer;
use Term​::ReadLine;
use File​::Find;
use File​::Temp qw/tempfile tempdir/;
use File​::Path;
use POSIX;

get_tags();

sub generate_tar
{
}

sub generate_iif
{
  my @​indexfiles;
}

sub arrayindex_lc
{
}

sub get_tags
{
  my $term = new Term​::ReadLine 'Archiver';
}

sub get_tag_hash
{
}

sub generate_taglist
{
}

sub process_file
{
}

sub run_filter
{
}
----------snip------------

Flags:
    category=core
    severity=medium

Site configuration information for perl v5.8.4:

Configured by Debian Project at Thu Mar 10 13:47:05 GMT 2005.

Summary of my perl5 (revision 5 version 8 subversion 4) configuration:
  Platform:
    osname=linux, osvers=2.6.8.1, archname=i386-linux-thread-multi
    uname='linux mcmurdo 2.6.8.1 #1 smp sat feb 26 13:03:40 utc 2005 i686 gnulinux '
    config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN -Dcccdlflags=-fPIC -Darchname=i386-linux -Dprefix=/usr -Dprivlib=/usr/share/perl/5.8 -Darchlib=/usr/lib/perl/5.8 -Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.8.4 -Dsitearch=/usr/local/lib/perl/5.8.4 -Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 -Dsiteman1dir=/usr/local/man/man1 -Dsiteman3dir=/usr/local/man/man3 -Dman1ext=1 -Dman3ext=3perl -Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Uusesfio -Uusenm -Duseshrplib -Dlibperl=libperl.so.5.8.4 -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 -DTHREADS_HAVE_PIDS -DDEBIAN -fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBIAN -fno-strict-aliasing -I/usr/local/include'
    ccversion='', gccversion='3.3.5 (Debian 1:3.3.5-8ubuntu2)', 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 -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
    perllibs=-ldl -lm -lpthread -lc -lcrypt
    libc=/lib/libc-2.3.2.so, so=so, useshrplib=true, libperl=libperl.so.5.8.4
    gnulibc_version='2.3.2'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
    


@INC for perl v5.8.4:
    /etc/perl
    /usr/local/lib/perl/5.8.4
    /usr/local/share/perl/5.8.4
    /usr/lib/perl5
    /usr/share/perl5
    /usr/lib/perl/5.8
    /usr/share/perl/5.8
    /usr/local/lib/site_perl
    .


Environment for perl v5.8.4:
    HOME=/home/nikratio
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LC_ADDRESS=de_DE.UTF-8
    LC_COLLATE=de_DE.UTF-8
    LC_CTYPE=de_DE.UTF-8
    LC_IDENTIFICATION=en_US.UTF-8
    LC_MEASUREMENT=de_DE.UTF-8
    LC_MESSAGES=en_US.UTF-8
    LC_MONETARY=de_DE.UTF-8
    LC_NAME=de_DE.UTF-8
    LC_NUMERIC=de_DE.UTF-8
    LC_PAPER=de_DE.UTF-8
    LC_TELEPHONE=de_DE.UTF-8
    LC_TIME=de_DE.UTF-8
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=~/bin:~/Projekte/Scripts:/opt/emperor/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11
    PERL_BADLANG (unset)
    SHELL=/bin/bash

From sts@accognoscere.org

On Fri, Sep 02, 2005 at 02​:58​:35PM -0700, Nikolaus Rath wrote​:

# New Ticket Created by Nikolaus Rath
# Please include the string​: [perl #37058]
# in the subject line of all future correspondence about this issue.
# <URL​: https://rt-archive.perl.org/perl5/Ticket/Display.html?id=37058 >

This is a bug report for perl from Nikolaus@​rath.org,
generated with the help of perlbug 1.35 running under perl v5.8.4.

-----------------------------------------------------------------
[Please enter your report here]
Hi!

The following perl-file produces a segfault as soon as the last line of
code has been executed. I removed as much stuff as possible, removing
anything more makes the segfault disappear.

----------snip------------
#!/usr/bin/perl

use strict;
use warnings;
use Date​::Parse;
use IO​::File;
use XML​::Writer;
use Term​::ReadLine;
use File​::Find;
use File​::Temp qw/tempfile tempdir/;
use File​::Path;
use POSIX;

get_tags();

sub generate_tar
{
}

sub generate_iif
{
my @​indexfiles;
}

sub arrayindex_lc
{
}

sub get_tags
{
my $term = new Term​::ReadLine 'Archiver';
}

sub get_tag_hash
{
}

sub generate_taglist
{
}

sub process_file
{
}

sub run_filter
{
}
----------snip------------

Couldn't neither reproduce the segmentation fault with Perl 5.8.5
nor with Perl 5.8.7 on OpenBSD 3.6. The last lines get parsed &
compiled, but are never executed since there's no call of one of
the subs except solely get_tags() itself.

If you remove which lines the segmentation fault disappears?

--
Steven Schubiger (sts@​accognoscere.org)

The RT System itself - Status changed from 'new' to 'open'

From Nikolaus@rath.org

Steven Schubiger via RT wrote​:

On Fri, Sep 02, 2005 at 02​:58​:35PM -0700, Nikolaus Rath wrote​:

# New Ticket Created by Nikolaus Rath
# Please include the string​: [perl #37058]
# in the subject line of all future correspondence about this issue.
# <URL​: https://rt-archive.perl.org/perl5/Ticket/Display.html?id=37058 >

This is a bug report for perl from Nikolaus@​rath.org,
generated with the help of perlbug 1.35 running under perl v5.8.4.

-----------------------------------------------------------------
[Please enter your report here]
Hi!

The following perl-file produces a segfault as soon as the last line of
code has been executed. I removed as much stuff as possible, removing
anything more makes the segfault disappear.

----------snip------------
#!/usr/bin/perl

use strict;
use warnings;
use Date​::Parse;
use IO​::File;
use XML​::Writer;
use Term​::ReadLine;
use File​::Find;
use File​::Temp qw/tempfile tempdir/;
use File​::Path;
use POSIX;

get_tags();

sub generate_tar
{
}

sub generate_iif
{
my @​indexfiles;
}

sub arrayindex_lc
{
}

sub get_tags
{
my $term = new Term​::ReadLine 'Archiver';
}

sub get_tag_hash
{
}

sub generate_taglist
{
}

sub process_file
{
}

sub run_filter
{
}
----------snip------------

Couldn't neither reproduce the segmentation fault with Perl 5.8.5
nor with Perl 5.8.7 on OpenBSD 3.6. The last lines get parsed &
compiled, but are never executed since there's no call of one of
the subs except solely get_tags() itself.

If you remove which lines the segmentation fault disappears?

For example, if I remove the definition of run_filter.

Regards,
Nikolaus

From sts@accognoscere.org

On Mon, Sep 26, 2005 at 08​:09​:08AM +0200, Nikolaus Rath wrote​:

Steven Schubiger via RT wrote​:

Couldn't neither reproduce the segmentation fault with Perl 5.8.5
nor with Perl 5.8.7 on OpenBSD 3.6. The last lines get parsed &
compiled, but are never executed since there's no call of one of
the subs except solely get_tags() itself.

If you remove which lines the segmentation fault disappears?

For example, if I remove the definition of run_filter.

Could you provide us a gdb backtrace of this code composition?

--
Steven Schubiger (sts@​accognoscere.org)

From sts@accognoscere.org

----- Forwarded message from Nikolaus Rath <Nikolaus@​rath.org> -----

Date​: Mon, 26 Sep 2005 15​:57​:49 +0200
From​: Nikolaus Rath <Nikolaus@​rath.org>
To​: Steven Schubiger <sts@​accognoscere.org>
Subject​: Re​: [perl #37058] script produces segfault (testcase attached)

Couldn't neither reproduce the segmentation fault with Perl 5.8.5
nor with Perl 5.8.7 on OpenBSD 3.6. The last lines get parsed &
compiled, but are never executed since there's no call of one of
the subs except solely get_tags() itself.

If you remove which lines the segmentation fault disappears?

For example, if I remove the definition of run_filter.

Could you provide us a gdb backtrace of this code composition?

Backtrace is attached.

Regards,
Nikolaus

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1210167168 (LWP 8349)]
0xb7e72acd in fclose () from /lib/tls/i686/cmov/libc.so.6
(gdb) bt
#0 0xb7e72acd in fclose () from /lib/tls/i686/cmov/libc.so.6
#1 0x0811878d in PerlIOStdio_close ()
#2 0x08116673 in PerlIO__close ()
#3 0x081166aa in Perl_PerlIO_close ()
#4 0x08115196 in PerlIO_cleantable ()
#5 0x08117bb7 in PerlIO_cleanup ()
#6 0x08061cfd in perl_destruct ()
#7 0x0805fb0d in main ()

----- End forwarded message -----

From Nikolaus@rath.org

Hello!

Any news on this bug? If not, maybe this is helpful​: After the last
glibc upgrade, perl no longer segfaults but prints​:

[127] nokile​:~/.vmware/sambashare$ ~/Work/perlbug.pl
*** glibc detected *** double free or corruption (!prev)​: 0x084deba0 ***
Aborted
[134] nokile​:~/.vmware/sambashare$

Regards,

  --Nikolaus

--
Es ist ärgerlich, wie oft man manche Arbeit aufschieben muss, ehe man
sie entgültig vergessen hat.