[perl #24436] $#[{}]{1} causes Perl to consume a large amount of memory

# New Ticket Created by  Andy Turner 
# Please include the string:  [perl #24436]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt2/Ticket/Display.html?id=24436 >



This is a bug report for perl from turner@mikomi.org,
generated with the help of perlbug 1.34 running under perl v5.8.1.


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You can reproduce the bug with the following:

perl -e '$#[{}]{1}'

It will malloc an unreasonable amount of memory (looks to be about 500
megs).

I can reproduce it on Debian Unstable (with the version of Perl reported
below), Debian Stable (Perl 5.6.1), RedHat 9 (Perl 5.8.0) and Mac OS X 10.3
(Perl 5.8.1-RC3).

ltrace with Perl 5.8.1 (Debian Unstable):
malloc(542600964)                                = 0x40221008

ltrace with Perl 5.6.1 (Debian Stable):
malloc(540901812)                                 = 0x40187008

I was unable to get useful traces on RedHat 9 and Mac OS X.  I suspect that
this is because they both ship with useithreads and Debian does not.

-----------------------------------------------------------------
---
Flags:
    category=core
    severity=medium
---
Site configuration information for perl v5.8.1:

Configured by Debian Project at Fri Oct 24 22:18:37 EST 2003.

Summary of my perl5 (revision 5.0 version 8 subversion 1) configuration:
  Platform:
    osname=linux, osvers=2.4.22-xfs+ti1211, archname=i386-linux-thread-multi
    uname='linux kosh 2.4.22-xfs+ti1211 #1 sun oct 12 12:47:45 est 2003 i686 gnulinux '
    config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN -Dcccdlflags=-fPIC -Darchname=i386-linux -Dprefix=/usr -Dprivlib=/usr/share/perl/5.8.1 -Darchlib=/usr/lib/perl/5.8.1 -Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.8.1 -Dsitearch=/usr/local/lib/perl/5.8.1 -Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 -Dsiteman1dir=/usr/local/man/man1 -Dsiteman3dir=/usr/local/man/man3 -Dman1ext=1 -Dman3ext=3perl -Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Uusesfio -Uusenm -Duseshrplib -Dlibperl=libperl.so.5.8.1 -Dd_dosuid -des'
    hint=recommended, useposix=true, d_sigaction=define
    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='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBIAN -fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O3',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBIAN -fno-strict-aliasing -I/usr/local/include'
    ccversion='', gccversion='3.3.2 (Debian)', 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
    libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
    perllibs=-ldl -lm -lpthread -lc -lcrypt
    libc=/lib/libc-2.3.2.so, so=so, useshrplib=true, libperl=libperl.so.5.8.1
    gnulibc_version='2.3.2'
  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 v5.8.1:
    /etc/perl
    /usr/local/lib/perl/5.8.1
    /usr/local/share/perl/5.8.1
    /usr/lib/perl5
    /usr/share/perl5
    /usr/lib/perl/5.8.1
    /usr/share/perl/5.8.1
    /usr/local/lib/site_perl
    /usr/local/lib/perl/5.8.0
    /usr/local/share/perl/5.8.0
    .

---
Environment for perl v5.8.1:
    HOME=/home/turner
    LANG=C
    LANGUAGE (unset)
    LC_CTYPE=en_US
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=~/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games
    PERL_BADLANG (unset)
    SHELL=/bin/bash

• [perl #24436] $#[{}]{1} causes Perl to consume a large amount of memory by Andy Turner
• Re: [perl #24436] $#[{}]{1} causes Perl to consume a large amount of memory by Jeff 'japhy' Pinyan
• RE: [perl #24436] $#[{}]{1} causes Perl to consume a large amount of memory by Orton, Yves
• Re: [perl #24436] $#[{}]{1} causes Perl to consume a large amount of memory by Abhijit Menon-Sen