[perl #22266] Perl segfaults on erroneous attempts to un-use a source filter

# New Ticket Created by  drc@inweb.co.uk 
# Please include the string:  [perl #22266]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt2/Ticket/Display.html?id=22266 >


This is a bug report for perl from drc@inweb.co.uk,
generated with the help of perlbug 1.33 running under perl v5.6.1.


-----------------------------------------------------------------

drc:~$ cat Filter/MyFilter.pm
package Filter::MyFilter;

use Filter::Simple sub {
        # this filter does nothing
};

1;

drc:~$ perl -e "use Filter::MyFilter;no Filter::MyFilter"
Segmentation fault

The segfault goes away if you remove the "no Filter::MyFilter".  Of course,
saying "no Filter::MyFilter" is an error here, as there is no unimport()
subroutine defined, but even when my perl code is in error, perl should not
segfault.


[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=low
---
Site configuration information for perl v5.6.1:

Configured by root at Wed Apr 11 22:55:30 PDT 2001.

Summary of my perl5 (revision 5.0 version 6 subversion 1) configuration:
  Platform:
    osname=linux, osvers=2.4.2, archname=i386-linux
    uname='linux grommet 2.4.2 #1 smp sun feb 25 16:33:33 pst 2001 i686 unknown '
    config_args='-de -Dprefix=/usr -Darchname=i386-linux -Dprivlib=/usr/lib/perl5 -Darchlib=/usr/lib/perl5/i386-linux -Dsitelib=/usr/lib/perl5/site_perl -Dsitearch=/usr/lib/perl5/site_perl/i386-linux'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
    useperlio=undef d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
  Compiler:
    cc='cc', ccflags ='-fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2',
    cppflags='-fno-strict-aliasing -I/usr/local/include'
    ccversion='', gccversion='2.95.3 20010315 (release)', 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, usemymalloc=n, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lnsl -lndbm -lgdbm -ldl -lm -lc -lcrypt -lutil
    perllibs=-lnsl -ldl -lm -lc -lcrypt -lutil
    libc=/lib/libc-2.2.2.so, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
    cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
    

---
@INC for perl v5.6.1:
    /usr/lib/perl5/i386-linux
    /usr/lib/perl5
    /usr/lib/perl5/site_perl/i386-linux
    /usr/lib/perl5/site_perl
    /usr/lib/perl5/site_perl
    .

---
Environment for perl v5.6.1:
    HOME=/newhome/drc
    LANG (unset)
    LANGUAGE (unset)
    LC_ALL=POSIX
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/usr/local/bin:/usr/bin:/bin:/usr/X11R6/bin:/usr/games:.:/opt/gnome/bin:/usr/share/texmf/bin:/usr/openwin/bin
    PERL_BADLANG (unset)
    SHELL=/bin/bash

• [perl #22266] Perl segfaults on erroneous attempts to un-use a source filter by perlbug-followup
• Re: [perl #22266] Perl segfaults on erroneous attempts to un-use a source filter by Nicholas Clark