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<== Date ==> <== Thread ==>

Subject: Re: CA internal failure
From: hill@luke.atdiv.lanl.gov (Jeff Hill)
To: CATimossi@lbl.gov
Cc: tech-talk@aps.anl.gov
Date: Wed, 17 Jan 96 10:33:29 MST
Chris,

> 
> A CA client application is giving the message:
> "Message: Channel Access Internal Failure"
> "Severity: Fatal"
> "Context bad client read io id from server"
> 
> Unfortunately, this seems to be an intermitent failure
> that happens a few times a day while the client is polling
> some PVs.
> 
> If you have any additional info. on this message, I'd like
> to know.

After a quick look in the source I see that this problem exists 
in 3.12.1.1 and is fixed in 3.12.2.1. The problem was discovered
by Fred Vong at APS and was related to a race condition where
the CA client lib receives a message for a particular resource 
(a channel or a monitor) shortly after that resource was deleted.

Jeff

______________________________________________________________________
Jeffrey O. Hill			Internet	johill@lanl.gov
LANL MS H820			Voice		505 665 1831
Los Alamos, NM 87545 USA 	FAX		505 665 5107



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