PI73752: SUPPRESS FFDC FOR COM.IBM.IO.ASYNC.ASYNCSOCKETCHANNEL 453

Fixes are available

APAR status

Closed as program error.

Error description

In the case where the Liberty Server uses Async I/O, as seen
by
message:
CWWKB0103I: Authorized service group ZOSAIO is available.

And a client opens a SSL connection where the SSL handshake
completes but no request is sent on the connection, and then
the connection is closed, the Liberty server will cut this
FFDC
in the log:

FFDC1015I: An FFDC Incident has been created:
"java.io.IOException: Async IO operation failed, internal
error
com.ibm.io.async.AsyncSocketChannel 453"

FFDC file contains:
Exception = java.io.IOException
Source = com.ibm.io.async.AsyncSocketChannel
probeid = 453
Stack Dump = java.io.IOException: Async IO operation failed,
internal error
at com.ibm.io.async.AbstractAsyncChannel.multiIO
(AbstractAsyncChannel.java:474)
at com.ibm.io.async.AsyncSocketChannelHelper.read
(AsyncSocketChannelHelper.java:243)
at com.ibm.io.async.AsyncSocketChannelHelper.read
(AsyncSocketChannelHelper.java:350)
at com.ibm.ws.tcpchannel.internal.AioSocketIOChannel.
readAIO(AioSocketIOChannel.java:124)
at
com.ibm.ws.tcpchannel.internal.AioTCPReadRequestContextImpl.
processAsyncReadRequest(AioTCPReadRequestContextImpl.java:79
)
at com.ibm.ws.tcpchannel.internal.TCPReadRequestContextImpl.
readInternal(TCPReadRequestContextImpl.java:166)
at com.ibm.ws.tcpchannel.internal.TCPReadRequestContextImpl.
read(TCPReadRequestContextImpl.java:137)
at com.ibm.ws.channel.ssl.internal.SSLReadServiceContext.
read(SSLReadServiceContext.java:494)
at com.ibm.ws.channel.ssl.internal.SSLReadServiceContext.
read(SSLReadServiceContext.java:377)
at com.ibm.ws.channel.ssl.internal.SSLConnectionLink.
readyInboundPostHandshake(SSLConnectionLink.java:701)
at com.ibm.ws.channel.ssl.internal.
SSLConnectionLink$MyHandshakeCompletedCallback.complete
(SSLConnectionLink.java:391)
at com.ibm.ws.channel.ssl.internal.SSLUtils.handleHandshake
(SSLUtils.java:976)
at com.ibm.ws.channel.ssl.internal.SSLHandshakeIOCallback.
complete(SSLHandshakeIOCallback.java:88)
at com.ibm.ws.tcpchannel.internal.AioReadCompletionListener.
futureCompleted(AioReadCompletionListener.java:157)
at com.ibm.io.async.AbstractAsyncFuture$WorkCallback.
run(AbstractAsyncFuture.java:385)
at java.util.concurrent.ThreadPoolExecutor.runWorker
(ThreadPoolExecutor.java:1157)
at java.util.concurrent.ThreadPoolExecutor$Worker.
run(ThreadPoolExecutor.java:627)
at java.lang.Thread.run(Thread.java:798)

Local fix

Disable Async I/O with
com.ibm.ws.tcpchannel.useZosAio=false

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server Liberty for z/OS                     *
****************************************************************
* PROBLEM DESCRIPTION: FFDC incident for Async I/O read        *
*                      complete with 0 bytes on z/OS           *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
A server running Asynchronous TCP/IP Sockets I/O for Liberty on
z/OS (asyncIO) may observe FFDC Incidents related to read
requests
receiving 0 bytes read.

A client started connection was closed without sending any data.
This
resulted in TCP/IP completing a synchronous server read request
immediately
with an indication of 0 bytes read.

The asyncIO java code created the following FFDC, before
throwing an
IOException to cleanup the server-side of the connection.  This
FFDC is
not needed as this is a "normal" scenario.

FFDC1015I: An FFDC Incident has been created:
"java.io.IOException:
Async IO operation failed, internal error
com.ibm.io.async.AsyncSocketChannel 453"

Problem conclusion

Code has been modified to remove the creation of an FFDC
Incident
when receiving 0 bytes on a read request that completes
immediately.

The fix for this APAR is currently targeted for inclusion in fix
pack 17.0.0.1.  Please refer to the Recommended Updates page for
delivery information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980

Temporary fix

Comments

APAR Information

APAR number
PI73752
Reported component name
LIBERTY PROF -
Reported component ID
5655W6514
Reported release
CD0
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-12-14
Closed date
2017-01-25
Last modified date
2017-01-25

APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:

Fix information

Fixed component name
LIBERTY PROF -
Fixed component ID
5655W6514

Applicable component levels

RCD0 PSY
UP

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SS7K4U","label":"WebSphere Application Server for z\/OS"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"CD0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
04 May 2022

Tips

PI73752: SUPPRESS FFDC FOR COM.IBM.IO.ASYNC.ASYNCSOCKETCHANNEL 453

Fixes are available

Subscribe

APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Fix information

Fixed component name

Fixed component ID

Applicable component levels

RCD0 PSY

Document Information

Share your feedback

Need support?