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[perl #54934] Attempt to free unreferenced scalar fiddling with the symbol table
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From:
Niko Tyni
Date:
May 28, 2008 04:50
Subject:
[perl #54934] Attempt to free unreferenced scalar fiddling with the symbol table
Message ID:
rt-3.6.HEAD-11257-1211914985-529.54934-75-0@perl.org
# New Ticket Created by Niko Tyni
# Please include the string: [perl #54934]
# in the subject line of all future correspondence about this issue.
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=54934 >
This is a bug report for perl from Niko Tyni <ntyni@debian.org>,
generated with the help of perlbug 1.36 running under perl 5.10.0.
-----------------------------------------------------------------
As seen in <http://cpantesters.perl.org/show/PerlIO-via-dynamic.html>,
the test suite of the PerlIO::via::dynamic CPAN module generates
'Attempt to free unreferenced scalar' warnings with recent perl versions,
including 5.10.0 but not 5.8.8.
The warnings are still there on blead @33937; bisecting shows the warnings
started with
Change 24966 by nicholas@ship-in-a-bottle on 2005/06/23 21:30:33
Remove the reference loop between symbol tables and typeglobs. Typeglobs
now have a weak reference onto their symbol table.
This snippet is the smallest I can make it. The original code deletes
a dynamically created package instead which makes more sense than this.
#!/usr/bin/perl
package test;
sub PUSHED {
return \*FOO;
}
1;
package main;
{
open my $fh, '</';
binmode($fh, ':via(test)');
}
delete $::{'test::'};
__END__
-----------------------------------------------------------------
---
Flags:
category=core
severity=medium
---
Site configuration information for perl 5.10.0:
Configured by Debian Project at Thu May 8 11:57:24 UTC 2008.
Summary of my perl5 (revision 5 version 10 subversion 0) configuration:
Platform:
osname=linux, osvers=2.6.18-6-xen-amd64, archname=x86_64-linux-gnu-thread-multi
uname='linux sid 2.6.18-6-xen-amd64 #1 smp thu apr 24 05:10:26 utc 2008 x86_64 gnulinux '
config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN -Dcccdlflags=-fPIC -Darchname=x86_64-linux-gnu -Dprefix=/usr -Dprivlib=/usr/share/perl/5.10 -Darchlib=/usr/lib/perl/5.10 -Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.10.0 -Dsitearch=/usr/local/lib/perl/5.10.0 -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 -Ud_ualarm -Uusesfio -Uusenm -DDEBUGGING=-g -Doptimize=-O2 -Duseshrplib -Dlibperl=libperl.so.5.10.0 -Dd_dosuid -des'
hint=recommended, useposix=true, d_sigaction=define
useithreads=define, usemultiplicity=define
useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
use64bitint=define, use64bitall=define, uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler:
cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
optimize='-O2 -g',
cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fno-strict-aliasing -pipe -I/usr/local/include'
ccversion='', gccversion='4.2.3 (Debian 4.2.3-5)', 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 =' -L/usr/local/lib'
libpth=/usr/local/lib /lib /usr/lib /lib64 /usr/lib64
libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
perllibs=-ldl -lm -lpthread -lc -lcrypt
libc=/lib/libc-2.7.so, so=so, useshrplib=true, libperl=libperl.so.5.10.0
gnulibc_version='2.7'
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
cccdlflags='-fPIC', lddlflags='-shared -O2 -g -L/usr/local/lib'
Locally applied patches:
---
@INC for perl 5.10.0:
/etc/perl
/usr/local/lib/perl/5.10.0
/usr/local/share/perl/5.10.0
/usr/lib/perl5
/usr/share/perl5
/usr/lib/perl/5.10
/usr/share/perl/5.10
/usr/local/lib/site_perl
.
---
Environment for perl 5.10.0:
HOME=/home/niko
LANG=en_US.UTF-8
LANGUAGE (unset)
LC_CTYPE=fi_FI.UTF-8
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/home/niko/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games:/sbin:/usr/sbin
PERL_BADLANG (unset)
SHELL=/bin/zsh
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[perl #54934] Attempt to free unreferenced scalar fiddling with the symbol table
by Niko Tyni