Memory leak with break-on-regexp condition #2331

p5pRT · 2000-08-07T22:20:02Z

Migrated from rt.perl.org#3655 (status was 'resolved')

Searchable as RT3655$

p5pRT · 2000-08-07T22:20:02Z

From rlm@raggy.doubledogmusic.com

Created by rlm@scareduck.com

Whenever I use perl -d and install a breakpoint which does a
conditional break on a regular expression, I get a severe
memory leak. Following is a minimal test case:

-----
#!/usr/bin/perl

open(YES,"yes|");

#
# do forever
#
while (<YES>)
{
my(@y) = split(/\s+/);
$foo = $yes;
}
-----

Run this as perl -d, and type 'b 11 $foo =~ /JFDKFDJ/'.

If you're running Linux with the /proc filesystem enabled, you can see
the memory leak in progress by finding the process id, then typing

cd /proc/<pid>
while true; do
clear
grep Vm status
sleep 1
done

Perl Info



Site configuration information for perl 5.00503:

Configured by root at Wed Feb  2 15:34:50 EST 2000.

Summary of my perl5 (5.0 patchlevel 5 subversion 3) configuration:
  Platform:
    osname=linux, osvers=2.2.5-22smp, archname=i386-linux
    uname='linux porky.devel.redhat.com 2.2.5-22smp #1 smp wed jun 2 09:11:51 edt 1999 i686 unknown '
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef useperlio=undef d_sfio=undef
  Compiler:
    cc='cc', optimize='-O2 -m486 -fno-strength-reduce', gccversion=egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)
    cppflags='-Dbool=char -DHAS_BOOL -I/usr/local/include'
    ccflags ='-Dbool=char -DHAS_BOOL -I/usr/local/include'
    stdchar='char', d_stdstdio=undef, usevfork=false
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    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 -lposix -lcrypt
    libc=, 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 5.00503:
    /usr/home/rlm/src/perls
    /usr/lib/perl5/5.00503/i386-linux
    /usr/lib/perl5/5.00503
    /usr/lib/perl5/site_perl/5.005/i386-linux
    /usr/lib/perl5/site_perl/5.005
    .


Environment for perl 5.00503:
    HOME=/usr/home/rlm
    LANG=en_US
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/usr/bin:/bin:/usr/X11R6/bin:/usr/local/bin:/sbin:/usr/sbin:/usr/home/rlm/src/perls
    PERL5LIB=/usr/home/rlm/src/perls
    PERL_BADLANG (unset)
    SHELL=/bin/bash

p5pRT · 2000-08-08T06:47:07Z

From [Unknown Contact. See original ticket]

Rob McMillin <rlm@raggy.doubledogmusic.com> wrote

Whenever I use perl -d and install a breakpoint which does a
conditional break on a regular expression, I get a severe
memory leak. Following is a minimal test case:

Great minds think alike. Or some other proverb.

I had also discovered this bug and posted a fix yesterday.

So this should be fixed in Perl 5.6.1. If you need a patch sooner,
mail me and I'll send one suitable for perl5.005_03.

Thankyou for the bug report.

Oh, and your test case wasn't minimal - mine was only 3 lines. :-)

Mike Guy

p5pRT closed this as completed Nov 28, 2003

p5pRT added Severity Low distro-Linux labels Oct 18, 2019

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Memory leak with break-on-regexp condition #2331

Memory leak with break-on-regexp condition #2331

p5pRT commented Aug 7, 2000

p5pRT commented Aug 7, 2000

p5pRT commented Aug 8, 2000

Memory leak with break-on-regexp condition #2331

Memory leak with break-on-regexp condition #2331

Comments

p5pRT commented Aug 7, 2000

p5pRT commented Aug 7, 2000

From rlm@raggy.doubledogmusic.com

Created by rlm@scareduck.com

p5pRT commented Aug 8, 2000

From [Unknown Contact. See original ticket]