[perl #21322] Closures could leak memory

# New Ticket Created by  "Vadim Konovalov" 
# Please include the string:  [perl #21322]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt2/Ticket/Display.html?id=21322 >


This is a bug report for perl from Administrator@localhost,
generated with the help of perlbug 1.33 running under perl v5.6.1.


-----------------------------------------------------------------
[Please enter your report here]

Following code leaks memory:

my $foo = 'asdf' x 1000;

for (1..900000) {
    my $outer_sub = sub {
        my $inner_sub = sub { $foo };
    }
}

Tested with 5.8.0 as well as with 5.6.1.

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

Configured by Administrator at Wed May  2 01:31:01 2001.

Summary of my perl5 (revision 5 version 6 subversion 1) configuration:
  Platform:
    osname=MSWin32, osvers=4.0, archname=MSWin32-x86-multi-thread
    uname=''
    config_args='undef'
    hint=recommended, useposix=true, d_sigaction=undef
    usethreads=undef use5005threads=undef useithreads=define
usemultiplicity=define
    useperlio=undef d_sfio=undef uselargefiles=undef usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
  Compiler:
    cc='cl', ccflags
='-nologo -O1 -MD -DNDEBUG -DWIN32 -D_CONSOLE -DNO_STRICT -DHAVE_DES_FCRYPT 
 -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DPERL_MSVCRT_READFIX',
    optimize='-O1 -MD -DNDEBUG',
    cppflags='-DWIN32'
    ccversion='', gccversion='', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=undef, longlongsize=8, d_longdbl=define, longdblsize=10
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t',
lseeksize=4
    alignbytes=8, usemymalloc=n, prototype=define
  Linker and Libraries:
    ld='', ldflags
'-nologo -nodefaultlib -release  -libpath:"d:\perl561\lib\CORE"  -machine:x8
6'
    libpth="D:\MSVStudio\VC98\LIB" "D:\MSVStudio\VC98\MFC\LIB"
"D:\apps\SQLLIB\LIB" "d:\perl561\lib\CORE"
    libs=  oldnames.lib kernel32.lib user32.lib gdi32.lib winspool.lib
comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib  netapi32.lib
uuid.lib wsock32.lib mpr.lib winmm.lib  version.lib odbc32.lib odbccp32.lib
msvcrt.lib
    perllibs=  oldnames.lib kernel32.lib user32.lib gdi32.lib winspool.lib
comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib  netapi32.lib
uuid.lib wsock32.lib mpr.lib winmm.lib  version.lib odbc32.lib odbccp32.lib
msvcrt.lib
    libc=msvcrt.lib, so=dll, useshrplib=yes, libperl=perl56.lib
  Dynamic Linking:
    dlsrc=dl_win32.xs, dlext=dll, d_dlsymun=undef, ccdlflags=' '
    cccdlflags=' ',
ddlflags='-dll -nologo -nodefaultlib -release  -libpath:"d:\perl561\lib\CORE
"  -machine:x86'

Locally applied patches:
    ACTIVEPERL_LOCAL_PATCHES_ENTRY

---
@INC for perl v5.6.1:
    D:\Work\PerlScripts\utl
    D:\Work\PerlScripts\translations
    D:\Work\PerlScripts\sgml
    D:\Work\PerlScripts\pleps
    d:/perl561/lib
    d:/perl561/site/lib
    .

---
Environment for perl v5.6.1:
    HOME=d:\apps
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)

PATH=C:\WINNT\system32;C:\WINNT;C:\WINNT\system32\WBEM;d:\sh;d:\perl561\bin;
d:\apps\tcl\bin;D:\MSVStudio\Common\msdev98\BIN;D:\MSVStudio\VC98\BIN;D:\MSV
Studio\Common\TOOLS\WINNT;D:\MSVStudio\Common\TOOLS;d:\apps\vim;d:\apps\vsli
ck-40\win;d:\bin;d:\cygwin\bin;d:\borland\cbuilder5\bin;d:\apps\JGenerator
2.1 MX\bin;C:\Program Files\Common Files\Adaptec Shared\System;C:\Program
Files\Common Files\Autodesk Shared\
    PERL5CFG=d:\apps

PERL5LIB=D:\Work\PerlScripts\utl;D:\Work\PerlScripts\translations;D:\Work\Pe
rlScripts\sgml;D:\Work\PerlScripts\pleps
    PERL_BADLANG (unset)
    SHELL (unset)

• [perl #21322] Closures could leak memory by Vadim Konovalov
• Re: [perl #21322] Closures could leak memory by Dave Mitchell