Re: Use of freed value in iteration

[Stuart Kendrick]

i don't have an answer for this, but i have more data.
-i've replicated the issue under perl-5.8.3/net-snmp-5.0.9 and 
perl-5.8.5/net-snmp-5.1.2.rc2

-and i find that if replace the SNMP.pm bulkwalk method with the 
command-line snmpbulkwalk command, that the issue goes away:

guru> cat test-cmd
#!/opt/vdops/bin/perl
use strict;
use warnings;
use Data::Dumper;
use SNMP;
my $obj = "sysDescr";
my $read = "public";
my ($sess, $val, $vb);
my %esx = (     "10.10.22.8" => "b2-esx",
                "10.10.16.8" => "a1-esx",
                "10.10.18.8" => "a2-esx",
                "10.10.20.8" => "a3-esx",
           );
for my $addr (keys %esx) {
  print "Processing $addr\n";
  $val = `/opt/local/bin/snmpbulkwalk -c $read $addr $obj`;
  print Dumper($val);
}
guru> ./test-cmd
Processing 10.10.18.8
$VAR1 = 'RFC1213-MIB::sysDescr.0 = STRING: "Cisco Systems, Inc. 
WS-C4006.Cisco Catalyst Operating System Software, Version 7.6(7).Copyright (c) 1995-2004
by Cisco Systems, Inc.."
';
Processing 10.10.22.8
$VAR1 = 'RFC1213-MIB::sysDescr.0 = STRING: "Cisco Systems, Inc. 
WS-C4006.Cisco Catalyst Operating System Software, Version 7.6(7).Copyright (c) 1995-2004 
by Cisco Systems, Inc.."
';
Processing 10.10.20.8
$VAR1 = 'RFC1213-MIB::sysDescr.0 = STRING: "Cisco Systems, Inc. 
WS-C4006.Cisco Catalyst Operating System Software, Version 7.6(7).Copyright (c) 1995-2004 
by Cisco Systems, Inc.."
';
Processing 10.10.16.8
$VAR1 = 'RFC1213-MIB::sysDescr.0 = STRING: "Cisco Systems, Inc. 
WS-C4006.Cisco Catalyst Operating System Software, Version 7.6(7).Copyright (c) 1995-2004 
by Cisco Systems, Inc.."
';
guru>

i would really like this to work ... i'm in the middle of a big project, 
and this issue has me stumped.  if you can think of a way for me to 
analyze the issue further, please drop me a line.

--sk
stuart kendrick
fhcrc
Re:  Date: Wed, 4 Aug 2004 08:36:42 -0700 (PDT)
From: Stuart Kendrick <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: Use of freed value in iteration
hi folks,
i'm not sure if this is a comp.perl.lang.misc question or net-snmp SNMP.pm
question ...
the first thing i don't understand is why the first $val, the one for
140.107.18.5, has the contents of %esx screwed into it ... this doesn't
make sense to me.  the output of Data::Dumper for the second $val, the one
for 140.107.22.5, now that makes sense to me.
and the second thing i don't understand is why Perl bombs with 'Use of
freed value in iteration' ... i don't see where i'm modifying the contents
of %esx in my loop.
[...]

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