Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Wed, 13 Dec 2006 13:52:39 -0600

I've been running Marty's mrkSoftTest accessApp code, and I've noticed

that when shutting down the accessRemote IOC in the IOC-IOC test, I get

the following message on exit if the accessLocal IOC was started after

the accessRemote IOC and is still running:

uranus% ../../bin/linux-x86/access accessRemote.main
asSetFilename("../../accessApp/acf/remote.acf")
dbLoadDatabase("../../dbd/access.dbd")
access_registerRecordDeviceDriver(pdbbase)
dbLoadRecords("../../accessApp/db/remote.db")
iocInit
Starting iocInit
############################################################################
## EPICS R3.14.9-CVS $$Name:  $$ $$Date: 2006/12/11 22:32:14 $$
## EPICS Base built Dec 11 2006
############################################################################
iocInit: All initialization complete

start accessLocal IOC at this point, which causes the following output

on this IOC:

epics> dbCaTask ca_get_callback Read access denied
mrkREMOTEprotectedRB has DB CA link to mrkLOCALprotected
dbCaTask ca_get_callback Read access denied
mrkREMOTEprotected has DB CA link to mrkLOCALprotected

Now shut down this IOC, either with exit or just Ctrl-D:

epics> exit
epicsThread: Unknown C++ exception in thread "CAC-UDP" at Wed Dec 13 2006 13:06:48.21231000
terminate called after throwing an instance of ''
FATAL: exception not rethrown
epicsThread: Unknown C++ exception in thread "CAC-UDP" at Wed Dec 13 2006 13:06:48.21843000
terminate called recursively
CA client library tcp receive thread terminating due to a C++ exception
FATAL: exception not rethrown
CA client library tcp receive thread terminating due to a C++ exception
FATAL: exception not rethrown
Abort

If I shut down the accessLocal IOC first, no exception messages appear.

 This problem only happens when I get the "Read access denied"

messages. The two IOCs can be on the same or on different linux hosts

to see the problem, but it doesn't appear if I run either of them on

solaris, even when I get the "Read access denied" messages. There is

probably some connection with the host names in the access security

configuration files, because it doesn't occur if I run the accessRemote

IOC on a linux machine that isn't listed in the HAG on the accessLocal

IOC, but if I add that IOC to the HAG there it does occur.

Jeff -- any ideas? I realize this problem may be somewhat tricky to

trace, and since it's a shutdown issue I don't think it's a show-stopper

- the process does exit, just not cleanly in this circumstance. If you

want to try and replicate it, follow the instructions in the

mrkSoftTest/accessApp/README file.

- Andrew
--
There is considerable overlap between the intelligence of the smartest
bears and the dumbest tourists -- Yosemite National Park Ranger

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System