[perl #58614] foreach @foo ( @bar ) causes segfault with namespace::clean

["nothingmuch@syeeda.local (via RT)" <perlbug-followup@perl.org>]

# New Ticket Created by  nothingmuch@syeeda.local 
# Please include the string:  [perl #58614]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=58614 >


This is a bug report for perl from nothingmuch@syeeda.local,
generated with the help of perlbug 1.35 running under perl v5.10.0.


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The following script produces a segfault or bus error for me:

package Foo;
use Moose;

use namespace::clean -except => 'meta';

sub bar {
    my ( $self, @args ) = @_;

    my @ret; # without this it's a segfault, with it it's a bus error (null pointer deref on osx)

    foreach my @error ( @args ) {
    }
}


Moose uses Sub::Exporter to create export closures for its declaration syntax.

These are then deleted by namespace::clean when the Scope::Guard it puts in %^H
is stringified and thus goes out of scope.

I suspect that the parse failure is causing %^H to be cleaned up differently,
and that the garbage collection is causing these issues.

I can't reduce the test case any more than this.


[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=low
---
This perlbug was built using Perl v5.8.8 - Fri May  2 00:15:29 CST 2008
It is being executed now by  Perl v5.10.0 - Tue Jan 29 05:46:20 IST 2008.

Site configuration information for perl v5.10.0:

Configured by nothingmuch at Tue Jan 29 05:46:20 IST 2008.

Summary of my perl5 (revision 5 version 10 subversion 0) configuration:
  Platform:
    osname=darwin, osvers=9.1.0, archname=darwin-multi-2level
    uname='darwin syeeda.local 9.1.0 darwin kernel version 9.1.0: wed oct 31 17:46:22 pdt 2007; root:xnu-1228.0.2~1release_i386 i386 '
    config_args='-Uusethreads -Dusemultiplicity -de -s'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=undef, 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 ='-fno-common -DPERL_DARWIN -no-cpp-precomp -fno-strict-aliasing -pipe -I/usr/local/include',
    optimize='-O3',
    cppflags='-no-cpp-precomp -fno-common -DPERL_DARWIN -no-cpp-precomp -fno-strict-aliasing -pipe -I/usr/local/include'
    ccversion='', gccversion='4.0.1 (Apple Inc. build 5465)', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='env MACOSX_DEPLOYMENT_TARGET=10.3 cc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /usr/lib
    libs=-ldbm -ldl -lm -lutil -lc
    perllibs=-ldl -lm -lutil -lc
    libc=/usr/lib/libc.dylib, so=dylib, useshrplib=false, libperl=libperl.a
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=bundle, d_dlsymun=undef, ccdlflags=' '
    cccdlflags=' ', lddlflags=' -bundle -undefined dynamic_lookup -L/usr/local/lib'

Locally applied patches:
    

---
@INC for perl v5.10.0:
    /usr/local/svk-1.06/perl/darwin-thread-multi-2level/
    /usr/local/lib/perl5/5.10.0/darwin-multi-2level
    /usr/local/lib/perl5/5.10.0
    /usr/local/lib/perl5/site_perl/5.10.0/darwin-multi-2level
    /usr/local/lib/perl5/site_perl/5.10.0
    /usr/local/lib/perl5/site_perl/5.8.8
    /usr/local/lib/perl5/site_perl/5.8.6
    /usr/local/lib/perl5/site_perl
    .

---
Environment for perl v5.10.0:
    DYLD_LIBRARY_PATH (unset)
    HOME=/Users/nothingmuch
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LC_ALL=en_US.UTF-8
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/Users/nothingmuch/bin:/Users/nothingmuch/bin:/bin:/sbin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/Applications/Graphviz.app/Contents/MacOS:/Applications/Doxygen.app/Contents/Resources:/Applications/MPlayer OSX.app/Contents/Resources/External_Binaries/mplayer_intel.app/Contents/MacOS:/opt/local/bin:/opt/local/sbin:/usr/local/perls/blead/bin:/usr/local/perls/5.6.2/bin:/Applications/Graphviz.app/Contents/MacOS:/Developer/Tools
    PERL5LIB=/usr/local/svk-1.06/perl/darwin-thread-multi-2level/
    PERL_AUTOINSTALL=--checkonly
    PERL_BADLANG (unset)
    PERL_MM_USE_DEFAULT=1
    SHELL=/bin/bash

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Follow-Ups from:

Dave Mitchell <davem@iabyn.com>

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