Suspeneded task causes EPICS crash

["Erik Johansson" <erikj@keck.hawaii.edu>]

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