PM63475: EARLY START-UP OF SESSION INVALIDATION CAN CAUSE DEADLOCK WITH APPLICATION START-UP THREAD IN VERY RARE SITUATIONS

Fixes are available

APAR status

Closed as program error.

Error description

If the following conditions are true,

- application implements http session listeners
- application listener code and application initialization code
both passing to same synchronized resource and can get in
deadlock.
- application is running on clustered environment with
distributed sessions turned on.


In this very rare situation, application startup thread and
session invalidation thread can get in deadlock situation.

Local fix

```
Use scheduled invalidation
```

Problem summary

****************************************************************
* USERS AFFECTED:  IBM WebSphere Application Server Version    *
*                  7, 8, and 8.5 users.                        *
****************************************************************
* PROBLEM DESCRIPTION: The session invalidation alarm for an   *
*                      application starts firing before an     *
*                      application finishes starting.          *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
During server startup, the invalidation alarm associated with
each web module will start and begin to look for invalid
sessions. For applications that process session information on
startup, it may be desirable to delay the start of the
invalidation alarm.

Problem conclusion

A session manager custom property
DelayInvalidationAlarmDuringServerStartup was introduced. Set
this property to the desired numerical value (in seconds) to
delay the start of the invalidation alarm on server startup.

The fix for this APAR is currently targeted for inclusion in
fix pack 7.0.0.27, 8.0.0.6 and 8.5.0.2.  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
PM63475
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
2012-04-27
Closed date
2012-09-28
Last modified date
2012-09-28

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

PM74718

Fix information

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

Applicable component levels

R700 PSY
UP
R800 PSY
UP
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":"7.0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
28 October 2021

Tips

PM63475: EARLY START-UP OF SESSION INVALIDATION CAN CAUSE DEADLOCK WITH APPLICATION START-UP THREAD IN VERY RARE SITUATIONS

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

R800 PSY

R850 PSY

Document Information

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