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Subject: Re: Suspeneded task causes EPICS crash
From: Burkhard Kolb <[email protected]>
To: "Erik Johansson" <[email protected]>
Cc: <[email protected]>
Date: Tue, 6 Dec 2005 10:53:41 +0100
Hi Erik,

I had the same behaviour when a can bus device produced many CAN-messages
due to an error condition. This caused the ring buffer of the canbus receive task to overflow.
I temporarily increased the buffer to 3000 entries which helped. The real cure of course
was to fix the problem on the device.


Burkhard

On 06.12.2005, at 02:00, Erik Johansson wrote:

Hi all,

We are getting the following message on one of our IOCs. The CA event
task gets suspended, which effectively kills EPICS, as all channels
become disconnected after that:

task 1aa53f8 CA event suspended
./taskwd.c" line number=175
callbackRequest ring buffer full

From digging in the source code, it looks like enough callback requests
are requested to cause the ring buffer to overflow. We use the default
size of 2000 entries for the buffer.

Has anyone seen a failure like this before? Any advice on what to pursue
as far as troubleshooting?


I am concerned that simply increasing the number of entries in the
buffer may just be putting a band-aid on a bigger problem.

Thanks,

Erik

****************************************
Erik M. Johansson
Adaptive Optics Software Engineer
W. M. Keck Observatory
65-1120 Mamalahoa Hwy
Kamuela, HI 96743
Tel: 808-885-7887
Fax: 808-885-4464




References:
Suspeneded task causes EPICS crash Erik Johansson

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