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[perl #25145] Storable segfaults with B::Deparse + overload + cyclic structures
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From:
Sam Vilain
Date:
January 19, 2004 19:12
Subject:
[perl #25145] Storable segfaults with B::Deparse + overload + cyclic structures
Message ID:
rt-3.0.8-25145-70947.6.14181200015409@perl.org
# New Ticket Created by Sam Vilain
# Please include the string: [perl #25145]
# in the subject line of all future correspondence about this issue.
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=25145 >
This is a bug report for perl from sam@vilain.net,
generated with the help of perlbug 1.34 running under perl v5.8.1.
-----------------------------------------------------------------
[Please enter your report here]
Found a segfault with thawing standard Perl structures with Storable.
This seems to be a bug on all Storable versions I tested, which
includes Perls 5.6.1 - 5.8.3.
Note that it only seems to trigger, if there are back-references to
overloaded objects, *after* something has been deparsed via
B::Deparse - or is that thawed with eval?
The details of the structure don't seem to matter much, but I've made
the simplest structure I could manage that demonstrates the problem.
Which was a *lot* simpler than my original structure ;-).
Here's a test script, which I've tried to make as similar to the ones
in the Storable distribution as possible:
#!/usr/bin/perl
sub BEGIN {
if ($ENV{PERL_CORE}){
chdir('t') if -d 't';
@INC = ('.', '../lib');
} else {
unshift @INC, 't';
}
require Config; import Config;
if ($ENV{PERL_CORE} and $Config{'extensions'} !~ /\bStorable\b/) {
print "1..0 # Skip: Storable was not built\n";
exit 0;
}
}
use strict;
BEGIN {
if (!eval q{
use Test;
use B::Deparse 0.61;
use 5.006;
1;
}) {
print "1..0 # skip: tests only work with B::Deparse 0.61 and at least pe
rl 5.6.0\n";
exit;
}
require File::Spec;
if ($File::Spec::VERSION < 0.8) {
print "1..0 # Skip: newer File::Spec needed\n";
exit 0;
}
}
use Storable qw(retrieve store nstore freeze nfreeze thaw dclone);
use Safe;
#$Storable::DEBUGME = 1;
print "1..2\n";
{
package Banana;
use overload
'<=>' => \&compare,
'==' => \&equal,
fallback => 1;
sub compare { return int(rand(3))-1 };
sub equal { return 1 if rand(1) > 0.5 }
}
my (@a);
my $nasty =
[
foo => sub {
print "Hey, there's some code here!\n";
},
($a[0] = bless [ ], "Banana"),
($a[1] = [ ]),
];
# this one segfaults every time.
$a[0]->[0] = $a[0];
# this one only segfaults once in a while. Other times, it says:
# Cannot restore overloading on REF(0x815460c) (package <unknown>)
#$a[1]->[0] = $a[0];
print "not " unless $nasty;
print "ok 1\n";
$Storable::Deparse = 1;
$Storable::Eval = 1;
my $schema2 = dclone $nasty;
print "not " unless $nasty;
print "ok 2\n";
[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
category=core
severity=low
---
Site configuration information for perl v5.8.1:
Configured by Debian Project at Fri Sep 26 16:57:02 BST 2003.
Summary of my perl5 (revision 5.0 version 8 subversion 1) configuration:
Platform:
osname=linux, osvers=2.4.21-c17b, archname=i386-linux-thread-multi
uname='linux betelgeuse 2.4.21-c17b #2 sat sep 13 01:16:47 bst 2003 i686 unknown '
config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN -Dcccdlflags=-fPIC -Darchname=i386-linux -Dprefix=/usr -Dprivlib=/usr/share/perl/5.8.1 -Darchlib=/usr/lib/perl/5.8.1 -Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.8.1 -Dsitearch=/usr/local/lib/perl/5.8.1 -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.5.8.1 -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='-O3',
cppflags='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBIAN -fno-strict-aliasing -I/usr/local/include'
ccversion='', gccversion='2.95.4 20011002 (Debian prerelease)', 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-2.2.5.so, so=so, useshrplib=true, libperl=libperl.so.5.8.1
gnulibc_version='2.2.5'
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib'
Locally applied patches:
RC5
---
@INC for perl v5.8.1:
/etc/perl
/usr/local/lib/perl/5.8.1
/usr/local/share/perl/5.8.1
/usr/lib/perl5
/usr/share/perl5
/usr/lib/perl/5.8.1
/usr/share/perl/5.8.1
/usr/local/lib/site_perl
.
---
Environment for perl v5.8.1:
HOME=/home/sv
LANG (unset)
LANGUAGE (unset)
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/home/sv/bin:/usr/local/kde/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games:/usr/local/sbin:/usr/sbin:/sbin:/usr/local/mozilla
PERL_BADLANG (unset)
SHELL=/bin/bash
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[perl #25145] Storable segfaults with B::Deparse + overload + cyclic structures
by Sam Vilain