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[perl #57174] Recursion memory leak when assignment in if condition
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From:
Thushan Abeysekera
Date:
July 21, 2008 09:40
Subject:
[perl #57174] Recursion memory leak when assignment in if condition
Message ID:
rt-3.6.HEAD-29759-1216649574-167.57174-75-0@perl.org
# New Ticket Created by "Thushan Abeysekera"
# Please include the string: [perl #57174]
# in the subject line of all future correspondence about this issue.
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=57174 >
This is a bug report for perl from thushan.abeysekera@computershare.com,
generated with the help of perlbug 1.35 running under perl v5.8.6.
-----------------------------------------------------------------
There seems to be a memory leak when doing recursion with goto &sub_name syntax.
Run following two endless loops and check memory usage. While script 1 runs out of memory, script 2 runs without a problem.
Script 1 (This has the memory leak):
===================================
use strict;
test1();
sub test1 {
my $v=0;
if ($v = get_true()) {
goto &test1;
}
}
sub get_true {
return 1;
}
Script 2 (This runs without a problem):
======================================
use strict;
test1();
sub test1 {
my $v=0;
$v = get_true();
if ($v) {
goto &test1;
}
}
sub get_true {
return 1;
}
Originally observed in: perl, v5.8.6 built for MSWin32-x86-multi-thread
This problem can be replicated in perl 5.10.0 i686-linux-thread-multi.
Please check http://www.perlmonks.org/?node_id=698735 for a discussion on this.
[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
category=core
severity=medium
---
Site configuration information for perl v5.8.6:
Configured by ActiveState at Mon Dec 13 09:51:32 2004.
Summary of my perl5 (revision 5 version 8 subversion 6) configuration:
Platform:
osname=MSWin32, osvers=4.0, archname=MSWin32-x86-multi-thread
uname=''
config_args='undef'
hint=recommended, useposix=true, d_sigaction=undef
usethreads=define use5005threads=undef 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='cl', ccflags ='-nologo -Gf -W3 -MD -Zi -DNDEBUG -O1 -DWIN32 -D_CONSOLE -DNO_STRICT -DHAVE_DES_FCRYPT -DNO_HASH_SEED -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DUSE_PERLIO -DPERL_MSVCRT_READFIX',
optimize='-MD -Zi -DNDEBUG -O1',
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='__int64', lseeksize=8
alignbytes=8, prototype=define
Linker and Libraries:
ld='link', ldflags ='-nologo -nodefaultlib -debug -opt:ref,icf -libpath:"C:\Perl586\lib\CORE" -machine:x86'
libpth=\lib
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 ws2_32.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 ws2_32.lib mpr.lib winmm.lib version.lib odbc32.lib odbccp32.lib msvcrt.lib
libc=msvcrt.lib, so=dll, useshrplib=yes, libperl=perl58.lib
gnulibc_version='undef'
Dynamic Linking:
dlsrc=dl_win32.xs, dlext=dll, d_dlsymun=undef, ccdlflags=' '
cccdlflags=' ', lddlflags='-dll -nologo -nodefaultlib -debug -opt:ref,icf -libpath:"C:\Perl586\lib\CORE" -machine:x86'
Locally applied patches:
ACTIVEPERL_LOCAL_PATCHES_ENTRY
21540 Fix backward-compatibility issues in if.pm
23565 Wrong MANIFEST.SKIP
---
@INC for perl v5.8.6:
c:/Perl586/lib
c:/Perl586/site/lib
.
---
Environment for perl v5.8.6:
HOME (unset)
LANG (unset)
LANGUAGE (unset)
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=c:\perl586\bin;C:\Perl582\bin\;C:\Perl\bin;C:\PROGRA~1\ESWM\CLIENT~1\BIN;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\UltraEdit;C:\Program Files\Microsoft SQL Server\80\Tools\BINN;R:\Resource\GPD\Scripts\Canada;R:\Resource\GPD\Scripts\ver1.40;R:\Resource\GPD\Scripts\Ver1.4;R:\Resource\GPD\Scripts\ver1.40;R:\Resource\bin;C:\Perl586\bin\;C:\Program Files\ATI Technologies\ATI Control Panel
PERL_BADLANG (unset)
SHELL (unset)
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[perl #57174] Recursion memory leak when assignment in if condition
by Thushan Abeysekera