Bug 171197 - perl: double free or corruption (!prev)
Summary: perl: double free or corruption (!prev)
Alias: None
Product: Fedora
Classification: Fedora
Component: perl   
(Show other bugs)
Version: rawhide
Hardware: i386
OS: Linux
Target Milestone: ---
Assignee: Jason Vas Dias
QA Contact: David Lawrence
Depends On:
TreeView+ depends on / blocked
Reported: 2005-10-19 12:11 UTC by Radek Vokal
Modified: 2007-11-30 22:11 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2005-10-25 07:33:59 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
strace output (215.06 KB, application/octet-stream)
2005-10-19 12:12 UTC, Radek Vokal
no flags Details
perl module (3.14 KB, application/x-perl)
2005-10-19 12:13 UTC, Radek Vokal
no flags Details

Description Radek Vokal 2005-10-19 12:11:55 UTC
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8b5) Gecko/20051008 Fedora/1.5-0.5.0.beta2 Firefox/1.4.1

Description of problem:
A sample perl module for net-snmp causes double free corruption 

# perl ./perl_module.pl
starting perl_module.pl
perl_module.pl loaded ok
registering at netSnmp.999
NET-SNMP version 5.2.2.rc1 AgentX subagent connected
started us as a subagent (NetSNMP::agent=HASH(0x917c360))
shutting down
mainloop excercised
*** glibc detected *** perl: double free or corruption (!prev): 0x091c3768 ***

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. start net-snmp
add following line to snmpd.conf 

master agentx
2. start perl module (perl /path/to/perl_module.pl)
3. hit ctrl-c

Additional info:

testing with rawhide net-snmp

Comment 1 Radek Vokal 2005-10-19 12:12:50 UTC
Created attachment 120156 [details]
strace output

Comment 2 Radek Vokal 2005-10-19 12:13:22 UTC
Created attachment 120157 [details]
perl module

Comment 3 Warren Togami 2005-10-19 14:32:15 UTC
Could you please test this in previous dists, especially RHEL versions?

Comment 4 Radek Vokal 2005-10-19 14:41:49 UTC
This worked on RHEL3, works on RHEL4, only rawhide seems to be broken. 

Comment 5 Warren Togami 2005-10-19 14:47:53 UTC
Thanks for the analysis.  Can someone in the perl team report this upstream and
cross-reference with bug numbers?

Comment 6 Jason Vas Dias 2005-10-24 21:30:39 UTC
I cannot reproduce this bug with net-snmp-, glibc-2.3.90-15, and
perl-5.8.7-0.5.fc5 .

I added the 'master agentx' to the default /etc/snmp/snmpd.conf file .

$ ./perl_module.pl
starting perl_module.pl
perl_module.pl loaded ok
registering at netSnmp.999
started us as a subagent (NetSNMP::agent=HASH(0x90514cc))
( pressed CTRL-C )
shutting down
mainloop excercised

I repeated this 10 times in a row with no glibc double free detected and a
0 exit status . The /var/net-snmp/perl.conf file was written OK .

Can you still reproduce this ? 

If so, does the /etc/snmp/snmpd.conf configuration file you use differ in any
way from the default, with 'master agentx' added at the end ?

Comment 7 Radek Vokal 2005-10-25 07:33:59 UTC
Seems to be gone

# rpm -q perl glibc

Can't say if it was glibc issue, I keep my test box rawhide up2date :) 

Closing as rawhide

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