Question about NRPE operation

[Andreas Ericsson]

schönfeld / in-medias-res wrote:
> Hi,
> 
> thanks for your answere. It helped me a lot.
> 
> Andreas Ericsson schrieb:
> 
>>>If so: Linux ncpfs is not able of threading
>>>ncpfs operations. So if one process is accessing the ncpfs and gets
>>>a SIGKILL, the ncp connection becomes invalid and the source of my
>>>problem would be identified.
>>>
>>
>>This really can't be. Any locks and resources held by a terminated
>>process should be cleared by the kernel (if not by the process itself).
>>If they aren't, you've found a kernel bug.
> 
> 
> Yes it is a bug in the ncpfs code of the kernel. Well not really a bug
> but an implementation weakness. The maintainer of the kernel ncpfs code
> So yes i could take it as a bug or just as an implementation weakness.
> Anyways would that identify my problems and make me really unhappy with
> that.
> stated the following in the kernel mailinglist a while ago:
> 
> "You also must not send SIGKILL to processes which are in the middle of
> NCP transaction. Because of ncpfs does not use its own thread (or bh)
> to implement NCP ping-pong protocol, connection becomes invalid after
> such action, as ping-pong was not successfully completed."
> 
> Well to know that doesn't make me happier but a little bit wiser.
> 
> What could be a possible solution / workaround? Any ideas?
> 

Make sure the program holding the lock exits gracefully by catching a 
SIGALRM rather than receiving the SIGKILL from nrpe.

If that doesn't work, a kernel-patch is required.

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Lead Developer


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