Experimental Physics and
Industrial Control System

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<== Date ==>		<== Thread ==>

Subject:	When I use an IOC in a container, streamDevice occasionally reports that protocol has been aborted, which causes the records in the IOC to become inaccessible from the host computer.
From:	"Wang, Andrew via Tech-talk" <tech-talk at aps.anl.gov>
To:	EPICS tech-talk <tech-talk at aps.anl.gov>
Date:	Fri, 12 May 2023 18:06:22 +0000

Hi all,

I have created multiple IOCs for the project in which I am involved. They are all running in their own Docker container in a host computer running Ubuntu 20.04. In each Docker container, the following EPICs and support module versions are used.

EPICS: 7.0.4
StreamDevice: 2.8.15
Asyn: 4.41

In one of the IOCs, I have a SSEQ record that is used to push a scalar value to multiple records that set four parameters for the target instrument. There is an instance where streamDevice is unable to push the value to the second parameter, causing the protocol to abort. Then, a few minutes later, my colleagues and I have observed that no records from the IOC in question can be accessed through Channel Access. This is the error message that we receive.

Read operation timed out: some PV data was not read.

<RECORD_NAME> 0

CA.Client.Exception……………………………………………………..

Warning: “Virtual circuit disconnect”

Context: “op=0, channel=<RECORD_NAME>, type=DBR_TIME_DOUBLE, count=1, ctx=”<IP ADDRESS:PORT>”

Source File: ../getCopy.cpp line 91

Current Time: <TIME>

This also meant that I was unable to check the STAT field to see what the cause of the abortion was.

Thank you and I look forward to hearing back from everyone.

Andy

Purple ribbon awareness