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Memory Leak with Threads #9897

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p5pRT opened this issue Oct 6, 2009 · 7 comments

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commented Oct 6, 2009

Migrated from rt.perl.org#69598 (status was 'resolved')

Searchable as RT69598$

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commented Oct 6, 2009

From @stuck-in-the-matrix

Created by @stuck-in-the-matrix

The following script leaks memory. Bug appears to also affect others
on the site Perlmonks.
Please visit http​://www.perlmonks.org/?node_id=799383 for more
versions that this bug affects.

Sample code to reproduce bug​:

#!/usr/bin/perl

use Thread;
use Time​::HiRes qw(usleep);

while(usleep(100)) {
my $thr1 = new Thread \&doNothing;
$thr1->join;
}

sub doNothing {}

Perl Info

Flags:
    category=core
    severity=high

Site configuration information for perl 5.10.0:

Configured by Debian Project at Fri Jun 26 18:43:11 UTC 2009.

Summary of my perl5 (revision 5 version 10 subversion 0) configuration:
  Platform:
    osname=linux, osvers=2.6.24-23-server, archname=i486-linux-gnu-thread-multi
    uname='linux rothera 2.6.24-23-server #1 smp wed apr 1 22:22:14
utc 2009 i686 gnulinux '
    config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN
-Dcccdlflags=-fPIC -Darchname=i486-linux-gnu -Dprefix=/usr
-Dprivlib=/usr/share/perl/5.10 -Darchlib=/usr/lib/perl/5.10
-Dvendorprefix=/usr -Dvendorlib=/usr/sh$
    hint=recommended, useposix=true, d_sigaction=define
    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='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN
-fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64',
    optimize='-O2 -g',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fno-strict-aliasing
-pipe -I/usr/local/include'
    ccversion='', gccversion='4.3.3', 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, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib /usr/lib64
    libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
    perllibs=-ldl -lm -lpthread -lc -lcrypt
    libc=/lib/libc-2.9.so, so=so, useshrplib=true, libperl=libperl.so.5.10.0
    gnulibc_version='2.9'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -O2 -g -L/usr/local/lib'

Locally applied patches:



@INC for perl 5.10.0:
    /etc/perl
    /usr/local/lib/perl/5.10.0
    /usr/local/share/perl/5.10.0
    /usr/lib/perl5
    /usr/share/perl5
    /usr/lib/perl/5.10
    /usr/share/perl/5.10
    /usr/local/lib/site_perl
    .


Environment for perl 5.10.0:
    HOME=/home/jbaumgartner
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
    PERL_BADLANG (unset)
    SHELL=/bin/bash

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commented Nov 11, 2009

sgc294@internode.on.net - Status changed from 'new' to 'open'

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commented Nov 11, 2009

From jarich@perltraining.com.au

The following script leaks memory.

use Thread;

G'day Jason Baumgartner.

Thanks for spotting this, it's certainly an interesting leak of scope.
While we're working on this, you may want to investigate the threads and
threads​::shared modules which take advantage of the new Perl threads model.

Thanks again,

  Jacinta

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commented Nov 26, 2009

From zwon@trinitum.org

On Wed Nov 11 01​:47​:37 2009, jarich wrote​:

While we're working on this, you may want to investigate the threads and
threads​::shared modules which take advantage of the new Perl threads
model.

There's no difference which module to use, the following sample leaking
memory. Tested on Ubuntu 9.04 with perl-5.10.0 and on Ubuntu 9.10 with
5.10.0, 5.10.1, and 5.11.2.

use strict;
use warnings;
use threads;
use Time​::HiRes qw(usleep);

my $count = 0;
while( 1 ) {
  usleep(100);
  my $thr1 = threads->create( \&doNothing );
  $thr1->join;
  unless( ++$count % 1000 ) {
  # prints RSS
  printf "%3d​: %s\n", $count,
  ( split /\s+/, qx[ps vhp $$] )[ 7 ];
  }
}

sub doNothing { 1 }

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commented Apr 3, 2010

From perl@arisoft.fi

The following script leaks memory.

This simplified sample leaks memory in Linux but not in Windows! Tested
with 5.10.0 and 5.10.1 which was locally compiled from CPAN source.

use threads;
threads->create(sub {})->join while 1;

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commented Oct 30, 2010

@iabyn - Status changed from 'open' to 'resolved'

@p5pRT p5pRT closed this Oct 30, 2010
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commented Oct 30, 2010

From @iabyn

This appears to leak only on none-debugging builds,
and appears to have been fixed sometime between 5.13.4 and 5.13.5

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