EPICS Re: CA internal failure

Experimental Physics and Industrial Control System

1994 1995 <1996> 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024	Index	1994 1995 <1996> 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
<== Date ==>		<== Thread ==>

Subject:	Re: CA internal failure
From:	[email protected] (Jeff Hill)
To:	[email protected]
Cc:	[email protected]
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	[email protected]
LANL MS H820			Voice		505 665 1831
Los Alamos, NM 87545 USA 	FAX		505 665 5107

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