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[perl #133326] Storable's recursion check fires even inunproblematic cases

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From:
slaven@rezic.de
Date:
July 3, 2018 08:40
Subject:
[perl #133326] Storable's recursion check fires even inunproblematic cases
Message ID:
rt-4.0.24-25584-1530607245-842.133326-75-0@perl.org
# New Ticket Created by  slaven@rezic.de 
# Please include the string:  [perl #133326]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=133326 >



This is a bug report for perl from slaven@rezic.de,
generated with the help of perlbug 1.41 running under perl 5.28.0.


-----------------------------------------------------------------
The recursion check introduced in Storable 3.x croaks in cases
where there is no problematic recursion involved. A sample oneliner:

$ perl5.28.0 -E 'use Storable qw(dclone); say "version=",$Storable::VERSION; say "limit=",$Storable::recursion_limit; my @tt; for (1..16000) { my $t = [[[]]]; push @tt, $t } dclone \@tt'
version=3.08
limit=15692
Max. recursion depth with nested structures exceeded at -e line 1.

(Depending on the calculated recursion_limit the number of iterations
has to be adjusted)

This is not a problem with earlier Storable versions, even with much more
elements in this array:

$ perl5.26.2 -E 'use Storable qw(dclone); say "version=",$Storable::VERSION; say "limit=",$Storable::recursion_limit; my @tt; for (1..1_000_000) { my $t = [[[]]]; push @tt, $t } dclone \@tt' 
version=2.62
limit=
(no output)

If $Storable::DEBUGME is set (and a debugging perl is available),
then one can see that recur_depth is constantly increasing.


BTW: Storable's bug queue currently points to rt.perl.org. But
https://rt.cpan.org/Public/Dist/Display.html?Name=Storable still
exists and has a lot of open issues, and I find it much easier
to find Storable-related issues in a specific bug queue than in
the huge and rather unstructured perl bug queue. For example,
even if we have the flag "module=..." created by perlbug
it is nowhere reflected in rt.perl.org (e.g. it's not possible
to search for this field, it seems).

-----------------------------------------------------------------
---
Flags:
    category=library
    severity=high
    module=Storable
---
Site configuration information for perl 5.28.0:

Configured by eserte at Sat Jun 23 08:28:02 CEST 2018.

Summary of my perl5 (revision 5 version 28 subversion 0) configuration:
   
  Platform:
    osname=linux
    osvers=3.16.0-4-amd64
    archname=x86_64-linux
    uname='linux cabulja 3.16.0-4-amd64 #1 smp debian 3.16.51-3 (2017-12-13) x86_64 gnulinux '
    config_args='-ds -e -Dprefix=/opt/perl-5.28.0 -Dcf_email=srezic@cpan.org'
    hint=recommended
    useposix=true
    d_sigaction=define
    useithreads=undef
    usemultiplicity=undef
    use64bitint=define
    use64bitall=define
    uselongdouble=undef
    usemymalloc=n
    default_inc_excludes_dot=define
    bincompat5005=undef
  Compiler:
    cc='cc'
    ccflags ='-fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2'
    optimize='-O2'
    cppflags='-fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
    ccversion=''
    gccversion='4.9.2'
    gccosandvers=''
    intsize=4
    longsize=8
    ptrsize=8
    doublesize=8
    byteorder=12345678
    doublekind=3
    d_longlong=define
    longlongsize=8
    d_longdbl=define
    longdblsize=16
    longdblkind=3
    ivtype='long'
    ivsize=8
    nvtype='double'
    nvsize=8
    Off_t='off_t'
    lseeksize=8
    alignbytes=8
    prototype=define
  Linker and Libraries:
    ld='cc'
    ldflags =' -fstack-protector-strong -L/usr/local/lib'
    libpth=/usr/local/lib /usr/lib/gcc/x86_64-linux-gnu/4.9/include-fixed /usr/include/x86_64-linux-gnu /usr/lib /lib/x86_64-linux-gnu /lib/../lib /usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib
    libs=-lpthread -lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat
    perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
    libc=libc-2.19.so
    so=so
    useshrplib=false
    libperl=libperl.a
    gnulibc_version='2.19'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs
    dlext=so
    d_dlsymun=undef
    ccdlflags='-Wl,-E'
    cccdlflags='-fPIC'
    lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector-strong'


---
@INC for perl 5.28.0:
    /opt/perl-5.28.0/lib/site_perl/5.28.0/x86_64-linux
    /opt/perl-5.28.0/lib/site_perl/5.28.0
    /opt/perl-5.28.0/lib/5.28.0/x86_64-linux
    /opt/perl-5.28.0/lib/5.28.0

---
Environment for perl 5.28.0:
    HOME=/home/eserte
    LANG=en_US.UTF-8
    LANGUAGE=en_US:en
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/eserte/bin/linux-gnu:/home/eserte/bin/sh:/home/eserte/bin:/home/eserte/bin/pistachio-perl/bin:/usr/games:/home/eserte/devel
    PERLDOC=-MPod::Perldoc::ToTextOverstrike
    PERL_BADLANG (unset)
    SHELL=/bin/zsh


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