PI37409: POSSIBLE ABENDEC3 TIMEOUT IN WEBSPHERE Z/OS SERVANT REGION WHEN RUNNING AS CLIENT WITH WEBSERVICES AND JMS (SIBUS) IN SAME SR

Fixes are available

APAR status

Closed as program error.

Error description

When running customer application code in WebSphere Application
Server z/OS and the application uses WebServices and JMS getting
messages from a Messaging Engine on a separate WebSphere
Application Server (the Messaging Engine is running in the
Adjunct of the other WebSphere Server).  The first Server may
experience a hang in the Servant with a traceback similar to:
java.lang.Object.wait(Native Method)
java.lang.Object.wait(Object.java:167
com.ibm.ws.sib.jfapchannel.impl.ExchangeReceiveListener.
   waitToComplete(ExchangeReceiveListener.java:227)
com.ibm.ws.sib.jfapchannel.impl.ConversationImpl.
   exchange(ConversationImpl.java:988)
com.ibm.ws.sib.comms.common.JFAPCommunicator.
   jfapExchange(JFAPCommunicator.java:386)
com.ibm.ws.sib.comms.client.ClientSideConnection.
   trmHandshakeExchange(ClientSideConnection.java:501)
.....

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server V8.5.                                *
****************************************************************
* PROBLEM DESCRIPTION: Customer experiences ABENDS in the      *
*                      SERVANT region. The network reader      *
*                      threads will never read data received   *
*                      over network.                           *
****************************************************************
* RECOMMENDATION:  NONE                                        *
****************************************************************
The servant regions in z/OS environment experiences ABEND due
to
TCP reader threads not being able to read data that is received
over network. The TCP reader threads exit due to the way it is
being used to create transport channels and  transport chains.
As a result of which, the data which is arrived over the
network
left unread. The SIB threads indefinitely wait for the channel
framework threads to provide this data. Because TCP READER
threads are not available the data is never passed on. The
problem occurs in z/OS environments when both SIB and
WebService
components are used heavily.

Problem conclusion

It is found that in z/OS environments the use of
ZAioTcpChannelFactory to create channels in the servant regions
is not allowed. The SIB code is modified to use the right
connection factory which is WSTCPChannelFactory instead of
using
ZAioTcpChannelFactory. This has been identified as the cause of
As part of this APAR code changes, the SIB code is
modified to use WSTCPChannelFactory to create channels for
BasicBootStrapMessaging Chain.

This change is controlled by a WebSphere Application Server
environment variable, SIB_Override_Channels_In_ZOSServant.
This environment variable needs to be set at the cell scope to
the value "true" or "TRUE" to enable the change introduced by
the APAR.


APAR PI37409 is currently targeted for inclusion in Fix Pack
8.5.5.8 of WebSphere Application Server V8.5.

Please refer to the Recommended Updates page for delivery
information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980

In addition, please refer to URL:
http://www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
for Fix Pack PTF information.

Temporary fix

Comments

APAR Information

APAR number
PI37409
Reported component name
WEBSPHERE FOR Z
Reported component ID
5655I3500
Reported release
850
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2015-03-19
Closed date
2015-09-09
Last modified date
2018-03-07

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

PI87876 PI94825

Fix information

Fixed component name
WEBSPHERE FOR Z
Fixed component ID
5655I3500

Applicable component levels

R850 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":"850","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
03 May 2022

Tips

PI37409: POSSIBLE ABENDEC3 TIMEOUT IN WEBSPHERE Z/OS SERVANT REGION WHEN RUNNING AS CLIENT WITH WEBSERVICES AND JMS (SIBUS) IN SAME SR

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

R850 PSY

Document Information

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