Experimental Physics and
Industrial Control System

Noboru Yamamoto <[email protected]> · Tue, 13 Nov 2001 08:58:37 +0900

Hi,

Geoff Savage wrote:
Hi,
Here is an error message about bad UDP messages. We have seen this from
two different IOCs over the weekend.
CAC: post_msg(): Corrupt cmd in UDP msg b
../iocinf.c: bad UDP msg from d0olctl50.fnal.gov:5064
Could this be caused by low memory on the IOCs? Each were running
around 80-90% of memory capacity of 16MB.
Thanks
Geoff

We occasionally encounter this message on our IOCs.

1) This message, as pointed by Andrew, one of our terminal server
responds to the CA search UDP

message at port 5064 and sends a NON-epics reply to the IOC which send
out the CA search UDP message.

Although we have several terminal servers of same type, only one of them
causes this symptom.
2) Usually, it indicates there is unresolved channel connection on this
IOC. So we have check channel

connection status on this IOC.
3) I believe the program output this message has memory leak. So if you
leave this message long enough, this would cause low memory situation,
according to my experience.
Regards,
Noboru Yamamoto
KEKB control group
KEK, JAPAN

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System