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List:       net-snmp-bugs
Subject:    [ net-snmp-Bugs-3049029 ] Memory leak in Perl async bulkwalk timeout
From:       "SourceForge.net" <noreply () sourceforge ! net>
Date:       2010-08-23 23:57:58
Message-ID: E1Ongtq-0003Lf-6d () sfs-web-7 ! v29 ! ch3 ! sourceforge ! com
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Bugs item #3049029, was opened at 2010-08-19 17:14
Message generated for change (Comment added) made by 
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=112694&aid=3049029&group_id=12694

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Category: perl
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: fennec@gmail.com ()
Assigned to: Nobody/Anonymous (nobody)
Summary: Memory leak in Perl async bulkwalk timeout with partial OIDs

Initial Comment:
We have encountered a memory leak when using the net-snmp Perl libraries, when we are \
bulk-walking a device and time out partway through the walk.

Attached please find a Perl script to demonstrate the problem. We point the script at \
a real network device (in our case, a Cisco wireless switch), request a bulk walk of \
.1, and set the timeout such that many OIDs are walked but the request still times \
out before it is complete. We use the Linux /proc/$$/status file as a convenience to \
demonstrate the scale of the memory leak. 

We observed a leak on the order of 50-60 kilobytes per timed-out poll using the \
parameters provided; adjusting the parameters so that more or fewer OIDs were walked \
before the timeout affected the size of the leak. No leak was observed when requests \
completed normally or when the device timed out without returning any data.

System details:
* net-snmp version 5.5
* Linux 2.6.18-164.9.1.el5PAE #1 SMP Tue Dec 15 21:41:47 EST 2009 i686 i686 i386 \
                GNU/Linux
* Perl v5.10.1

Sample output of attached script:

no results: Timeout
VmRSS:	   24848 kB
no results: Timeout
VmRSS:	   24920 kB
no results: Timeout
VmRSS:	   24972 kB
no results: Timeout
VmRSS:	   25028 kB
no results: Timeout
VmRSS:	   25076 kB
no results: Timeout
VmRSS:	   25128 kB
no results: Timeout
VmRSS:	   25184 kB
no results: Timeout
VmRSS:	   25236 kB
no results: Timeout
VmRSS:	   25296 kB
no results: Timeout
VmRSS:	   25340 kB
no results: Timeout
VmRSS:	   25396 kB
no results: Timeout
VmRSS:	   25440 kB
no results: Timeout
VmRSS:	   25496 kB
...

----------------------------------------------------------------------

> Comment By: fennec@gmail.com ()
Date: 2010-08-23 16:57

Message:
We have determined a way to end this memory leak and will attach a patch.
Could someone inspect it for correctness and eventual inclusion into the
official builds? Thanks a bundle.

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=112694&aid=3049029&group_id=12694

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