PM75801: PLUG-IN DEADLOCK BETWEEN TRYING TO READ/LOAD A NEW PLUGIN CONFIGURATION AND STARTING AN ESI MONITOR THREAD TO A SERVER

Fixes are available

APAR status

Closed as program error.

Error description

The plugin is in a mutex deadlock: one thread owns the
configuration mutex and is waiting on the the esi mutex, and
there is another thread that owns the esi mutex and is wating on
the configuration mutex. All incoming requests will try to get
the configuration mutex, so they will all get hung up.

Local fix

Turning the esi invalidator off bypasses the problem.
<Property Name="ESIInvalidationMonitor" Value="false"/>

Problem summary

****************************************************************
* USERS AFFECTED:  IBM WebSphere Application Server webserver  *
*                  plugin users                                *
****************************************************************
* PROBLEM DESCRIPTION: Deadlock can occur when reloading       *
*                      configuration and processing requests   *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
If there are frequent configuration changes such that the
plugin configuration is being reload and requests are being
processed, a deadlock situation can occur where the processing
request and the reload are both waiting for a semaphore. This
will only occur if ESI caching is enabled.

Problem conclusion

Change has been made to avoid the deadlock situation. If you
are disabling ESI caching, it is recommended to stop and
restart the webserver instead of a dynamic reload.

APAR PM75801 is currently targeted for inclusion in
Fick Packs 7.0.0.29, 8.0.0.6 and 8.5.5 of WebSphere
Application Server.

The fix will also be delivered as sysrouted APAR PM81813 in
WebSphere Application Server V6.1 Fix Pack 6.1.0.47 for z/OS.

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
PM75801
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
2012-10-24
Closed date
2013-01-04
Last modified date
2013-07-03

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

PM80013 PM81813

Fix information

Fixed component name
WEBSPHERE FOR Z
Fixed component ID
5655I3500

Applicable component levels

R700 PSY UK94926
UP13/06/20 P F306

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:
29 October 2021

Tips

PM75801: PLUG-IN DEADLOCK BETWEEN TRYING TO READ/LOAD A NEW PLUGIN CONFIGURATION AND STARTING AN ESI MONITOR THREAD TO A SERVER

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 UK94926

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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