PM16525: NATIVE OUTOFMEMORY AFTER SERVERAL APPLICATION RESTARTS

Fixes are available

APAR status

Closed as program error.

Error description

Native OutOfMemory after serveral application restarts

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server V6.1 and V7.0                        *
****************************************************************
* PROBLEM DESCRIPTION: ClassLoader leak from Application       *
*                      Server's thread pool when Java 2        *
*                      security is disabled.                   *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
When Java 2 security is disabled, it is possible for threads
created by the WebSphere Application Server thread pool to
retain references to CompoundClassLoader instances associated
with applications that may be stopped.  This can lead to out
of memory (OOM) conditions, as class loaders retain references
to all classes that they have loaded.

This occurs because ProtectionDomain objects which are copied
from the originating thread to the newly created threads
contain references to classes on the originating thread's
stack, which could include application code loaded by an
application classloader.  When Java 2 security is enabled,
those ProtectionDomains for classes on the stack below the
thread pool's create method are not copied.  If Java 2
security is disabled (which is the default), those
ProtectionDomains are copied and there is a chance for a
classloader leak.

Problem conclusion

This fix resolves this problem by using an
AccessController.doPrivileged(...) call which uses the Java 2
security-enabled behavior.  This change prevents the
ProtectionDomain objects for the originating thread from being
copied to the new thread pool thread, thus preventing the
classloader leak.

The fix for this APAR is currently targeted for inclusion in
fix packs 6.1.0.35 and 7.0.0.13.  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
PM16525
Reported component name
WEBS APP SERV N
Reported component ID
5724H8800
Reported release
700
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2010-06-15
Closed date
2010-07-21
Last modified date
2010-07-21

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

PM45628

Fix information

Fixed component name
WEBS APP SERV N
Fixed component ID
5724H8800

Applicable component levels

R700 PSY
UP

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
24 October 2021

Tips

PM16525: NATIVE OUTOFMEMORY AFTER SERVERAL APPLICATION RESTARTS

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

Document Information

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