Possible bug in NSCA

[Ton Voon]

On 13 Oct 2005, at 11:31, Chris Wilson wrote:

> On Thu, 2005-10-13 at 11:25, Ton Voon wrote:
>
>
>> Which platform are you running on? We're recently fixed a problem on
>> the plugins re: ECHLD status codes for spopen calls on Redhat ES4.
>>
>
> Running on Fedora Core 2. I don't know what spopen() does, but this is
> an error that occurs in accept() (where ECHILD doesn't make sense  
> to me,
> and is apparently undocumented).
>

As Fedora is a derivative of Red Hat ES, it could be related (or I  
could be leading you down a tangential path).

The thread was called "check_dns: DNS WARNING - nslookup returned  
error status" in the nagiosplug-devel mailing list, but here's a  
summary:

Problem was that using a popen call, nslookup and dig were  
occasionally returning ECHLD statuses on a wait() call and thus  
check_dns and check_dig were incorrectly returning warning statuses.  
Couldn't find any other commands causing the problem.

We created a test case where if you ran the nslookup command  
repeatedly, it would fail about 60% of the time (for 10 invocations).  
You'll find the test in the 1.4.2 release of the plugins.

Sasche Runschke has raised this with Red Hat. It has been  
acknowledged, but I haven't had an update recently.

The feeling is that the futex handling in the kernel is responsible,  
but I don't know if it could be related to your issue.

Ton

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