[Xymon] Parsing problems with client reports

Scot Kreienkamp Scot.Kreienkamp at la-z-boy.com
Thu Dec 15 15:53:36 CET 2016

Nothing.  No different behavior (other than no false alerts), no false alerts, no lines containing free or alloc in any log in /var/log/xymon, nothing.  Just quiet smooth operation.

Maybe in a specific function we don’t use that often?  I’ll leave the lines in there and see if anything happens.  If it continues smooth I’ll take the lines out after a month and see if it goes back to false reports.

Scot Kreienkamp  | Senior Systems Engineer | La-Z-Boy Corporate
One La-Z-Boy Drive | Monroe, Michigan 48162 | Office: 734-384-6403 | | Mobile: 7349151444 | Email: Scot.Kreienkamp at la-z-boy.com
From: Japheth Cleaver [mailto:cleaver at terabithia.org]
Sent: Wednesday, December 14, 2016 4:46 PM
To: Scot Kreienkamp; xymon at xymon.com
Subject: Re: [Xymon] Parsing problems with client reports

That's strange...
If anything, those switches should cause any hidden bugs with memory handling to be more quickly exposed, even to the point of aborting.

Have you noticed any free/alloc issues in xymond.log, or any other altered behavior since bouncing it?


On 12/14/2016 7:48 AM, Scot Kreienkamp wrote:
Not sure what those switches do but the xymon server has been much quieter since they were applied.
From: Xymon [mailto:xymon-bounces at xymon.com] On Behalf Of Japheth Cleaver
Sent: Tuesday, December 13, 2016 12:00 PM
To:xymon at xymon.com<mailto:xymon at xymon.com>
Subject: Re: [Xymon] Parsing problems with client reports

On 12/13/2016 7:01 AM, Scot Kreienkamp wrote:
Hello list,

Has anyone been working on the problem where reports from clients are getting confused on the server?  I am getting multiple false alerts daily now where it will turn back to green at the next test, and when I go to look at the test in xymon it’s because it’s only got partial information.  In multiple instances now I’ve been able to see the report from another client, in part or in full, in one clients page.  In the most recent incident last week I could see the beginning client line from another windows client report halfway down in the ports test for a Linux client.

All the false reports are really damaging the trust we place in Xymon to monitor our systems, and people are starting to just delete the warning emails without looking at them because we get so many false reports now.


Scot Kreienkamp | Senior Systems Engineer | La-Z-Boy Corporate
One La-Z-Boy Drive | Monroe, Michigan 48162  | • 734-384-6403 | | • 7349151444 | •  Scot.Kreienkamp at la-z-boy.com<mailto:%7BE-mail%7D>
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Can you enable MALLOC_PERTURB_=1 and MALLOC_CHECK_=3in the xymon environment? I've noticed this occasionally in the past and added debugging logic, but I wasn't able to reliably duplicate it. I noticed that it did seem to happen more often when the server was under memory pressure and didn't seem to be related to truncated (or garbled) incoming TCP connections.

Also, what version and distro?


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