[CSS] freeze and lost running PV in Boy Screens

[Maurizio Montis <Maurizio.Montis@lnl.infn.it>]

Hello to everyone,

using the CSS GUI to control EPICS variables provided by a VME system, i
saw "PV Disconnection" on the screen. On the VxWorks EPICS shell i found
this message:

#######################################################################
A call to 'assert(ev_que->evque[ev_que->putix] == EVENTQEMPTY)'
    by thread 'CAS-client' failed in ../dbEvent.c line 701.
EPICS Release EPICS R3.14.12.4 $Date: Mon 2013-12-16 15:51:45 -0600$.
Local time is 2014-04-29 10:05:52.897742610 MET
Please E-mail this message to the author or to tech-talk@aps.anl.gov
Calling epicsThreadSuspendSelf()
Thread CAS-client (0x6a2910) suspended
#######################################################################

The VME System has 2 different kind of acquisition boards, one for "slow
acquisition" and one for "fast acquisition". On the CSS side, i have a
main panel for the sub-system controlled and 2 popup windows, one for
each acquisition.

I tried some tests with this system (VME+CSS), and after some
investigation i've understood and observed the following points:

* when i open the popup related to the slow acquisition OR to the fast
acquisition, everything works correctly

* when i open one popup, i close it and i open the other one, it seem to
work correctly

* when i open the slow popup and after open the fast without closing the
previous one, in the slow acquisition i lost the connection with all the
PVs (freezing values AND/OR loosing connection). If i close the "fast"
popup, i return in the normal situation

* during this tests i checked through common epics command line tools
the PVs status and they continuously running without problems (no
problems with the VME IOC)

* i also tried to change the CSS version, using all the versions
available from SNS site (BASIC versions from 3.2.1 to 3.2.16) but i had
always the same situation.


Has someone seen this kind of behavior or this kind of messages before?
An indication for a point to start a deep investigation will be
appreciated.

Thanks in advance for any help

Regards,

- Maurizio




~~ Maurizio Montis - Control System Engineer ~~
   mobile: +39 3408428089
   mail: maurizio.montis@lnl.infn.it
   skype: maurizio_montis

Istituto Nazionale di Fisica Nucleare - Laboratori Nazionali di Legnaro
   V.le dell'Universita', 2
   35020 LEGNARO (PD) - ITALY