[ID 20010328.014] core dump on exit call

This is a bug report for perl from scott@gossamer-threads.com,
generated with the help of perlbug 1.28 running under perl v5.6.0.


-----------------------------------------------------------------
In perl versions 5.00401, 5.00404, and 5.00503 the following
causes a segv and core dump:
perl -wle 'local $main::foo->{bar}; $main::foo = {}; exit'

In perl version 5.6.0 the same code causes a segv but no
core dump.

If you remove the exit() call you get the warning:
"Attempt to free unreferenced scalar." on all the versions I 
have mentioned.

A stack trace in gdb shows:
#0  0x809a353 in Perl_leave_scope ()
#1  0x8099335 in Perl_pop_scope ()
#2  0x805c0a8 in Perl_my_failure_exit ()
#3  0x805bf29 in Perl_my_exit ()
#4  0x809f85f in Perl_pp_exit ()
#5  0x80b155d in Perl_runops_standard ()
#6  0x8059308 in perl_run ()
#7  0x805787f in main ()
#8  0x400671eb in __libc_start_main (main=0x8057810 <main>, argc=3, 
    argv=0xbffffca4, init=0x8056b2c <_init>, fini=0x80b15cc <_fini>, 
        rtld_fini=0x4000a610 <_dl_fini>, stack_end=0xbffffc9c)
            at ../sysdeps/generic/libc-start.c:90

These are the only version of perl I have to test this on
so I do not know if it applies to any other versions.

Cheers,

Scott

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=low
---
Site configuration information for perl v5.6.0:

Configured by pixel at Wed Jan 31 09:11:40 CET 2001.

Summary of my perl5 (revision 5.0 version 6 subversion 0) configuration:
  Platform:
    osname=linux, osvers=2.2.18-8mdksmp, archname=i386-linux
    uname='linux no.mandrakesoft.com 2.2.18-8mdksmp #1 smp tue jan 16 09:53:07 cet 2001 i686 unknown '
    config_args='-des -Darchname=i386-linux -Dd_dosuid -Ud_csh -Duseshrplib -Doptimize=-O3 -fomit-frame-pointer -pipe -mcpu=pentiumpro -march=i586 -ffast-math -Dprefix=/usr -Di_ndbm -Di_gdbm -Di_shadow -Di_syslog -Uuselargefiles -Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/lib/perl5/man/man3'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
    useperlio=undef d_sfio=undef uselargefiles=undef 
    use64bitint=undef use64bitall=undef uselongdouble=undef usesocks=undef
  Compiler:
    cc='cc', optimize='-O3 -fomit-frame-pointer -pipe -mcpu=pentiumpro -march=i586 -ffast-math', gccversion=2.96 20000731 (Linux-Mandrake 7.3)
    cppflags='-fno-strict-aliasing'
    ccflags ='-fno-strict-aliasing'
    stdchar='char', d_stdstdio=define, usevfork=false
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=4
    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 -ldl -lm -lc -lcrypt
    libc=/lib/libc-2.2.1.so, so=so, useshrplib=true, libperl=libperl.so
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic -Wl,-rpath,/usr/lib/perl5/5.6.0/i386-linux/CORE'
    cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
    

---
@INC for perl v5.6.0:
    /home/bline/projects/gmail/admin
    /usr/lib/perl5/5.6.0/i386-linux
    /usr/lib/perl5/5.6.0
    /usr/lib/perl5/site_perl/5.6.0/i386-linux
    /usr/lib/perl5/site_perl/5.6.0
    /usr/lib/perl5/site_perl
    .

---
Environment for perl v5.6.0:
    HOME=/home/bline
    LANG=en
    LANGUAGE=en_US:en
    LC_COLLATE=en_US
    LC_CTYPE=en_US
    LC_MESSAGES=en_US
    LC_MONETARY=en_US
    LC_NUMERIC=en_US
    LC_TIME=en_US
    LD_LIBRARY_PATH=/usr/lib/qt2/lib:/home/bline/package/bin:/usr/local/omni/lib/i586_linux_2.0_glibc2.1:/usr/lib/qt2/lib:/home/bline/package/bin:/usr/local/omni/lib/i586_linux_2.0_glibc2.1:
    LOGDIR (unset)
    PATH=/usr/lib/qt2/bin:/usr/Komodo-1.0:/home/bline/projects/tools:/usr/lib/qt2/bin:/usr/Komodo-1.0:/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/usr/games:/home/bline/bin
    PERLLIB=/home/bline/projects/gmail/admin
    PERL_BADLANG (unset)
    SHELL=/bin/bash

• [ID 20010328.014] core dump on exit call by sbeck
• Re: [ID 20010328.014] core dump on exit call by Stephen P. Potter