PQ62474: IHS PLUGIN FAILS INITIALIZATION WHEN RACE CONDITON OCCURS.

A fix is available
WebSphere Application Server Version 3.5 Fix Pack 7 (3.5.7)

APAR

APAR status
Closed as program error.

Error description
APACHE/IHS calls our initialization routine twice.  Because our
plugin
 can only stand to be called once there is a check that is
performed so
 that it is only initialized one time.  However sometimes a race
 condition can be encountered which results in the plugin not
 initializing at all.
Local fix
Problem summary
****************************************************************
* USERS AFFECTED: WebSphere Application Server users of        *
*                 IHS on UNIX Platforms.                       *
****************************************************************
* PROBLEM DESCRIPTION: Intermittently IHS fails to load the    *
*                      IHS plugin.  No trace plugin trace      *
*                      file will be produced and user will     *
*                      see that ALL requests that should       *
*                      be handled by WebSphere will return     *
*                      with 404.  This is a problem that       *
*                      the user will see immediately after     *
*                      starting the IHS webserver.             *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
At times when certain race condtions occur the WebSphere
plugin for IHS/APACHE will not initialize.  No errors will be
produce in the IHS/APACHE error_log but because the plugin
initialization fails, no plugin trace file are produced. When
this problem occurs users will notice that ALL requests that
should be handled by WebSphere will return with 404.

This is an intermittent problem which only would occur on UNIX
platforms.
Problem conclusion
Modified the IHS plugin to avoid the race condition that caused
the plugin to not initialize.
Temporary fix
pq62474_354_AIX.tar
Comments
APAR information
APAR numberPQ62474
Reported component nameWAS ADVANCED AI
Reported component ID5648C8400
Reported release350
StatusCLOSED PER
PENoPE
HIPERNoHIPER
Submitted date2002-06-20
Closed date2002-06-27
Last modified date2002-06-27

APAR is sysrouted FROM one or more of the following:

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


Modules/Macros
PLUGIN
APAR is sysrouted TO one or more of the following:Modules/Macros

Fix information
Fixed component nameWAS ADVANCED AI
Fixed component ID5648C8400

Applicable component levels
R350 PSYUP











Document Information

Product categories: Software, Application Servers, Distributed Application & Web Servers, WebSphere Application Server, General
Software version: 350
Reference #: PQ62474
IBM Group: Software Group
Modified date: 2002-06-27