PQ67165: ABEND0C4 IN BBOOWORK WHEN STRESS TEST WITH MIN_SRS=8

 A fix may be available

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APAR status
Closed as program error.

Error description
Customer was running a stress test on WebSphere service level
W401400 and z/os 1.3.  The use the tool LoadRunner to submit
http requests from a browser.  They had MIN_SRS=6 and it ran
fine.  When they experienced abends in the application server.
The symtom information from the SVC dump is:
Symptom            Symptom data
---------------    -------------
RIDS/BBOOWORK#L    BBOOWORK#L
RIDS/BBOOWORK      BBOOWORK
PIDS/5655A9801     5655A9801
AB/S00C4           00C4
RIDS/BBOOWORK#R    BBOOWORK#R
VALU/HE3E01018     E3E01018
REGS/09288         09288
.
REGS/060A8         060A8
PRCS/00000004      00000004
VALU/CSERVICES     SERVICES
.
The failing code pointed to a problem with cell pool usage.
The initial cell pool size is 100.  Apparently these were
exhausted so the code tried to extend the cell pool, but
the cell pools services are required to be run in key 0, but
the WebSphere code is running in key 2, hence the failure.
.
Update (11/12):
These symptoms have also been seen by another customer when
they have set MIN_SRS=4 and MIN_SRS=6.
Local fix
None at this time, but L3 is working on a temporary patch until
a more formal solution can be developed.  This apar will be
updated if that becomes available.
Problem summary
****************************************************************
* USERS AFFECTED: All users of WebSphere Application Server    *
*                 V4.0.1 for z/OS and OS/390                   *
****************************************************************
* PROBLEM DESCRIPTION: ABENDS0C4 reported in modules BBOOWORK, *
*                      BBOOSRR, and BBOTOTS.                   *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
WebSphere internal users of BACB_CPOOLID and BACB_CPOOLID_2PAGE
CPOOLs (bbo3bacb.mac) may receive ABEND0C4(s) if they cause the
CPOOL to expand.  A large number of the internal users of these
CPOOLs are using LINKAGE(BRANCH) on the "CPOOL (GET) UNCOND"
requests.  If there are no more cells in the CPOOL then it will
be expanded.  The CPOOL expansion code requires Supervisor
State and Key 0 for LINKAGE(BRANCH) users.  The internal users
of the above CPOOLs are usually in Key 2.  The ABEND0C4 occurs
in IGVCPEXT+288 -- trying to set an FRR (fails storing into
PSA).
Problem conclusion
Internal users of BACB_CPOOLID and BACB_CPOOLID_2PAGE CPOOLs
were changed to specify LINKAGE(SYSTEM) on the unconditional
(UNCOND) CPOOL (GET) requests.  CPOOL (GET) LINKAGE(SYSTEM)
causes a PC invocation of the IGVCPEXT routine, only if the
CPOOL needs to be expanded (the CPOOL (GET) routine will still
be branch entered). The PC invocation of the IGVCPEXT routine
removes the Key 0 requirement from the "CPOOL (GET) UNCOND"
caller.

The following publication was revised as a result
of APAR PQ67165:
________________________________________________________________
WebSphere Application Server V4.0.1 for z/OS and OS/390
Messages and Diagnosis
GA22-7837-06
________________________________________________________________
This APAR requires changes to documentation.

NOTE: Periodically, we refresh the documentation on our
Web site, so the changes might have been made before you
read this text. To access the latest on-line
documentation, go to the product library page at:


http://www.ibm.com/software/webservers/appserv/zos_os390
/library.html

________________________________________________________________
Chapter 15, pg. 418 (deleted)
DC3 020B0001
Explanation: RunAs services were invoked in the server region
but the Entry linkage dynamic area CPool obtain failed because
the cpoolID is invalid.
User Response: Contact the system administrator
________________________________________________________________
Chapter 15, pg. 418 (deleted)
DC3 03020003
Explanation: IBM Internal Only
User Response: Contact the IBM Support Center.
________________________________________________________________
Chapter 15, pg. 416 (deleted)
DC3 0205000E
Explanation: IBM Internal Only
User Response: Contact the IBM Support Center.
________________________________________________________________

APAR PQ67165 is associated with SERVICE LEVEL W401406 of
WebSphere Application Server V4.0.1 for z/OS and OS/390.
Temporary fix Comments
APAR information
APAR number PQ67165
Reported component name WASKBASE
Reported component ID 5655A9801
Reported release 401
Status CLOSED PER
PE NoPE
HIPER NoHIPER
Submitted date 2002-10-12
Closed date 2002-12-10
Last modified date 2003-01-04

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Modules/Macros
BBOUBINF          

Fix information
Fixed component name WASKBASE
Fixed component ID 5655A9801

Applicable component levels
R401 PSY UQ72501    UP02/12/17 P F212

  Fix is available
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Document Information


Product categories: Software > Application Servers > Distributed Application & Web Servers > WebSphere Application Server for z/OS
Operating system(s):
Software version: 401
Software edition:
Reference #: PQ67165
IBM Group: Software Group
Modified date: Jan 4, 2003