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[perl #117953] SDBM_File/GDBM_File errors

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From:
Jeremy Blain
Date:
May 11, 2013 09:02
Subject:
[perl #117953] SDBM_File/GDBM_File errors
Message ID:
rt-3.6.HEAD-6955-1368217379-1517.117953-75-0@perl.org
# New Ticket Created by  Jeremy Blain 
# Please include the string:  [perl #117953]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org:443/rt3/Ticket/Display.html?id=117953 >


This is a bug report for perl from cowboyatheart@gmail.com,
generated with the help of perlbug 1.39 running under perl 5.14.2.


-----------------------------------------------------------------
[Please describe your issue here]

GDBM_File, and SDBM_File both end early when using each to iterate over a
tied hash and deleting keys.

Test script:

use strict;
use warnings;
use Fcntl;
use SDBM_File;
use GDBM_File;
use DB_File;

# plain old hash
{
my %hash;

# add 100 keys
my $x = 1;
while ($x <= 100) {
$hash{$x} = $x;
++$x;
}

print "plain old hash has " . scalar(keys %hash) . " keys\n";

# iterate/delete
my $cnt = 0;
while (my ($key,$value) = each %hash) {
$cnt++;
delete $hash{$key};
}
print "deleted $cnt keys in plain old hash\n";
}
# sdbm
{
my %hash;
tie(%hash, 'SDBM_File', 'error.sdbm', O_RDWR|O_CREAT, 0666) or die $!;

# add 100 keys
my $x = 1;
while ($x <= 100) {
$hash{$x} = $x;
++$x;
}

print "sdbm has " . scalar(keys %hash) . " keys\n";

# iterate/delete
my $cnt = 0;
while (my ($key,$value) = each %hash) {
$cnt++;
delete $hash{$key};
}
print "deleted $cnt keys in sdbm\n";
}
# gdbm
{
my %hash;
tie(%hash, 'GDBM_File', 'error.gdbm', O_RDWR|O_CREAT, 0666) or die $!;

# add 100 keys
my $x = 1;
while ($x <= 100) {
$hash{$x} = $x;
++$x;
}
print "gdbm has " . scalar(keys %hash) . " keys\n";

# iterate/delete
my $cnt = 0;
while (my ($key,$value) = each %hash) {
$cnt++;
delete $hash{$key};
}
print "deleted $cnt keys in gdbm\n";

}
# bdb
{
my %hash;
tie(%hash, 'DB_File', 'error.bdb', O_RDWR|O_CREAT, 0666) or die $!;

# add 100 keys
my $x = 1;
while ($x <= 100) {
$hash{$x} = $x;
++$x;
}

print "bdb has " . scalar(keys %hash) . " keys\n";

# iterate/delete
my $cnt = 0;
while (my ($key,$value) = each %hash) {
$cnt++;
delete $hash{$key};
}
print "deleted $cnt keys in bdb\n";
}



Output:

plain old hash has 100 keys
deleted 100 keys in plain old hash
sdbm has 100 keys
deleted 50 keys in sdbm
gdbm has 100 keys
deleted 1 keys in gdbm
bdb has 100 keys
deleted 100 keys in bdb




[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=library
    severity=medium
    module=SDBM_File
---
Site configuration information for perl 5.14.2:

Configured by Debian Project at Sat Feb  9 13:59:28 UTC 2013.

Summary of my perl5 (revision 5 version 14 subversion 2) configuration:

  Platform:
    osname=linux, osvers=3.2.0-4-amd64,
archname=x86_64-linux-gnu-thread-multi
    uname='linux madeleine 3.2.0-4-amd64 #1 smp debian 3.2.32-1 x86_64
gnulinux '
    config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN
-D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector --param=ssp-buffer-size=4
-Wformat -Werror=format-security -Dldflags= -Wl,-z,relro
-Dlddlflags=-shared -Wl,-z,relro -Dcccdlflags=-fPIC
-Darchname=x86_64-linux-gnu -Dprefix=/usr -Dprivlib=/usr/share/perl/5.14
-Darchlib=/usr/lib/perl/5.14 -Dvendorprefix=/usr
-Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5
-Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.14.2
-Dsitearch=/usr/local/lib/perl/5.14.2 -Dman1dir=/usr/share/man/man1
-Dman3dir=/usr/share/man/man3 -Dsiteman1dir=/usr/local/man/man1
-Dsiteman3dir=/usr/local/man/man3 -Duse64bitint -Dman1ext=1 -Dman3ext=3perl
-Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Ud_ualarm -Uusesfio -Uusenm
-Ui_libutil -DDEBUGGING=-g -Doptimize=-O2 -Duseshrplib
-Dlibperl=libperl.so.5.14.2 -des'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=define, usemultiplicity=define
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=define, use64bitall=define, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN
-fstack-protector -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 -fstack-protector
-fno-strict-aliasing -pipe -I/usr/local/include'
    ccversion='', gccversion='4.7.2', gccosandvers=''
    intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
    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 -L/usr/local/lib'
    libpth=/usr/local/lib /lib/x86_64-linux-gnu /lib/../lib
/usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib /usr/lib
    libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
    perllibs=-ldl -lm -lpthread -lc -lcrypt
    libc=, so=so, useshrplib=true, libperl=libperl.so.5.14.2
    gnulibc_version='2.13'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib
-fstack-protector'

Locally applied patches:


---
@INC for perl 5.14.2:
    /etc/perl
    /usr/local/lib/perl/5.14.2
    /usr/local/share/perl/5.14.2
    /usr/lib/perl5
    /usr/share/perl5
    /usr/lib/perl/5.14
    /usr/share/perl/5.14
    /usr/local/lib/site_perl
    .

---
Environment for perl 5.14.2:
    HOME=/home/jeremy
    LANG=en_US.UTF-8
    LANGUAGE=en_CA:en
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)

PATH=/home/jeremy/devel/software/java/bin:/home/jeremy/devel/edate_third_party/ant/apache-ant-1.8.0/bin:/usr/local/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
    PERL_BADLANG (unset)
    SHELL=/bin/bash

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