PM39070: WEBSPHERE ADJUNCT AND SERVANT REGIONS LEAK MEMORY WHEN ANY XARESOURCE FAILS TO RECOVER

Fixes are available

APAR status

Closed as program error.

Error description

When running WebSphere Application Server zOS, the adjunct and
the servant regions' JVM heap grows consistently, possibly
leading to OutOfMemoryError.

A Java heap dump will have many of the following objects:
com.ibm.ws.sib.jfapchannel.impl.ConversationImpl
com.ibm.ws.sib.processor.impl.ConnectionImpl
com.ibm.ws.sib.jfapchannel.impl.OutboundConnection

Also, eventually the following messages are output to the log:

CWSIJ0055E: A resource shortage stopped a new connection from
being established.

During this time, a single unrelated XAResouce will be
continuously failing to recover successfully.

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server V7.0 and V8.0.                       *
****************************************************************
* PROBLEM DESCRIPTION: JVM heap growth eventually leading to   *
*                      OutOfMemoryError and or CWSIJ0055E      *
*                      messages.                               *
****************************************************************
                                                               *
****************************************************************
On WebSphere Application Server for zOS, if a single
XAResource fails to recover successfully, all XAResources in
the partner log are retried.  This exposes a Connection leak in
one of the Service Integration Bus XAResources which occurs
because of the lack of code to ensure that the Connection is
closed when the transaction service is finished with the
XAResource.
This leak in turn causes a memory leak in both the servant and
adjunct regions as each connection has an in memory
representation in both of these regions.
Eventually, SIB is unable to create more conversations and the
CWSIJ0055E message is output.
Distributed platforms will also experience this leak, but it
will only ever be a single Connection as recover is only
called once per XAResource.

Problem conclusion

This APAR resolves the problem by ensuring that the Connection
is closed whenever the transaction service is finished with
the XAResource.

APAR PM39070 is currently targeted for inclusion in Service
Level 7.0.0.21 and 8.0.0.1 of WebSphere Application Server  .

Please refer to URL:
//www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
for Fix Pack availability.

Temporary fix

Comments

APAR Information

APAR number
PM39070
Reported component name
WEBSPHERE FOR Z
Reported component ID
5655I3500
Reported release
700
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2011-05-12
Closed date
2011-07-08
Last modified date
2012-02-03

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

PM56368

Fix information

Fixed component name
WEBSPHERE FOR Z
Fixed component ID
5655I3500

Applicable component levels

R700 PSY UK74996
UP12/01/18 P 1201

Fix is available

Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

[{"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":"7.0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
27 October 2021

Tips

PM39070: WEBSPHERE ADJUNCT AND SERVANT REGIONS LEAK MEMORY WHEN ANY XARESOURCE FAILS TO RECOVER

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

R700 PSY UK74996

Fix is available

Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

Document Information

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