PI65836: JAVACORES CONTINUOUSLY CREATED ON A HUNG THREAD

Fixes are available

APAR status

Closed as program error.

Error description

When com.ibm.websphere.threadmonitor.dump.java is set to true
and if com.ibm.websphere.threadmonitor.dump.java.track is NOT
set then by default a java thread dump is created continuously
at the default hung thread detection time interval (default 3
mins). So basically it will continuously produce java thread
dumps every minute while the thread remains hung.

In customer situation the hung thread never recovers and as a
result a java thread dump is produced every 3 minutes and
fills up gigabytes of storage.

Local fix

You can set
com.ibm.websphere.threadmonitor.dump.java to 1

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server                                      *
****************************************************************
* PROBLEM DESCRIPTION: The hung thread detection system        *
*                      repeatedly dumps javacores for the      *
*                      same hung thread                        *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
The WebSphere Application Server thread monitor allows users
to track hung threads by periodically dumping a javacore as
long as the thread is detected as hung, using the
com.ibm.websphere.threadmonitor.dump.java.track property.
If this property is unset, the default value is set to be
identical to the value of
com.ibm.websphere.threadmonitor.dump.java.  If the property is
set to "true", the thread monitor sets those properties to the
maximum integer value, so a thread hung for a long period of
time would cause javacores to be thrown basically
indefinitely.
Users who had used this property on previous editions of
WebSphere Application Server would have been likely to use the
"true" value, as the property utilized boolean values in its
original incarnation, but since the "track" property did not
exist, they would have only had one javacore thrown per thread.

Problem conclusion

The default value of the "track" property was modified so that
if left unset, only one javacore would be thrown for a single
hung thread.

The fix for this APAR is currently targeted for inclusion in
fix packs 8.5.5.12 and 9.0.0.3.  Please refer to the
Recommended Updates page for delivery information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980

Temporary fix

As a workaround, users can set the system property
com.ibm.websphere.threadmonitor.dump.java.track to "1".

Comments

APAR Information

APAR number
PI65836
Reported component name
WEBS APP SERV N
Reported component ID
5724H8800
Reported release
850
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-07-13
Closed date
2016-11-22
Last modified date
2016-11-22

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
WEBS APP SERV N
Fixed component ID
5724H8800

Applicable component levels

R850 PSY
UP

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"8.5","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
04 May 2022

Tips

PI65836: JAVACORES CONTINUOUSLY CREATED ON A HUNG THREAD

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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