glibc error, invalid pointer when using guards #11676

p5pRT · 2011-09-29T07:04:29Z

Migrated from rt.perl.org#100340 (status was 'resolved')

Searchable as RT100340$

p5pRT · 2011-09-29T07:04:29Z

From ostmann@websuche.de

Created by ostmann@websuche.de

Attached pure-perl script produce on all tested versions following glibc error:

*** glibc detected *** /home/websuche/perl5lib/bin/perl: munmap_chunk(): invalid pointer: 0x0000000000f72c48 ***

TESTED VERSIONS:
5.8.8
5.10.0
5.10.1
5.14.0
5.14.1

SKRIPT:
#!/usr/bin/env perl

*guard::DESTROY = sub {
${$_[0]}->();
};

*guard = sub (&) {
my $callback = shift;
return bless \$callback, "guard"
};

my %t; %t = (
stash => {
guard => guard(sub{
print "Guard\n";
delete $t{stash};
}),
foo => "bar",
bar => "baz",
},
);

delete $t{stash}{guard};

Perl Info


Flags:
    category=core
    severity=high

Site configuration information for perl 5.10.0:

Configured by Debian Project at Thu Jun 30 20:30:13 UTC 2011.

Summary of my perl5 (revision 5 version 10 subversion 0) configuration:
  Platform:
    osname=linux, osvers=2.6.32-5-686, archname=i486-linux-gnu-thread-multi
    uname='linux callisto 2.6.32-5-686 #1 smp mon jun 13 04:13:06 utc 2011 i686 gnulinux '
    config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN -Dcccdlflags=-fPIC -Darchname=i486-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=undef, use64bitall=undef, 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='4.3.2', 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 /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=/root
    LANG=de_DE.UTF-8
    LANGUAGE=de_DE:de:en_GB:en
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/bin/X11
    PERL_BADLANG (unset)
    SHELL=/bin/bash

Flags:
    category=core
    severity=high

Site configuration information for perl 5.10.0:

Configured by Debian Project at Thu Jun 30 20:30:13 UTC 2011.

Summary of my perl5 (revision 5 version 10 subversion 0) configuration:
  Platform:
    osname=linux, osvers=2.6.32-5-686, archname=i486-linux-gnu-thread-multi
    uname='linux callisto 2.6.32-5-686 #1 smp mon jun 13 04:13:06 utc 2011 i686 gnulinux '
    config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN -Dcccdlflags=-fPIC -Darchname=i486-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=undef, use64bitall=undef, 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='4.3.2', 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 /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=/root
    LANG=de_DE.UTF-8
    LANGUAGE=de_DE:de:en_GB:en
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/bin/X11
    PERL_BADLANG (unset)
    SHELL=/bin/bash

p5pRT · 2011-09-29T07:37:02Z

From felix.ostmann@thewar.de

i tested this snippet on 3 different servers/workstations (debian
5.0/debian 6.0/ubuntu 10.04) with systemperl & selfbuilded perl

p5pRT · 2011-09-29T07:37:02Z

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

p5pRT · 2011-12-31T20:25:52Z

From @cpansprout

This appears to be related to #99660.

p5pRT · 2012-01-01T03:15:16Z

From @cpansprout

On Thu Sep 29 00:04:29 2011, ostmann@websuche.de wrote:

Attached pure-perl script produce on all tested versions following
glibc error:

*** glibc detected *** /home/websuche/perl5lib/bin/perl:
munmap_chunk(): invalid pointer: 0x0000000000f72c48 ***

TESTED VERSIONS:
5.8.8
5.10.0
5.10.1
5.14.0
5.14.1

SKRIPT:
#!/usr/bin/env perl

*guard::DESTROY = sub {
${$_[0]}->();
};

*guard = sub (&) {
my $callback = shift;
return bless \$callback, "guard"
};

my %t; %t = (
stash => {
guard => guard(sub{
print "Guard\n";
delete $t{stash};
}),
foo => "bar",
bar => "baz",
},
);

delete $t{stash}{guard};

This has been fixed with commit 3b2cd80. If you need to work around it
on older perls, call delete in non-void context:

() = delete $t{stash}{guard};

--

Father Chrysostomos

p5pRT · 2012-01-01T03:15:16Z

@cpansprout - Status changed from 'open' to 'resolved'

p5pRT closed this as completed Jan 1, 2012

p5pRT added Severity High distro-Linux type-core labels Oct 19, 2019

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glibc error, invalid pointer when using guards #11676

glibc error, invalid pointer when using guards #11676

p5pRT commented Sep 29, 2011

p5pRT commented Sep 29, 2011

p5pRT commented Sep 29, 2011

p5pRT commented Sep 29, 2011

p5pRT commented Dec 31, 2011

p5pRT commented Jan 1, 2012

p5pRT commented Jan 1, 2012

glibc error, invalid pointer when using guards #11676

glibc error, invalid pointer when using guards #11676

Comments

p5pRT commented Sep 29, 2011

p5pRT commented Sep 29, 2011

From ostmann@websuche.de

Created by ostmann@websuche.de

p5pRT commented Sep 29, 2011

From felix.ostmann@thewar.de

p5pRT commented Sep 29, 2011

p5pRT commented Dec 31, 2011

From @cpansprout

p5pRT commented Jan 1, 2012

From @cpansprout

p5pRT commented Jan 1, 2012