PM59352: ABEND S0C4 WHEN RUNNING HIGH WORKLOADS WITH WOLA; LSCB leak

Fixes are available

APAR status

Closed as program error.

Error description

This problem was observed during high workload tests with WOLA
and calls made from multiple IMS regions in parallel.

The issues is triggered by the application calling over WOLA
passing a wrong message data length each time it does a WOLA
invoke BBOA1INV API call.
This ultimately leads WebSphere to leak LSCBs.  Once the
LSCBPOOL in the pool created is exhausted, next StorageObtain
returns -1 (7FFFFFF).  WebSphere tries to use this pointer
without checking the return code and it fails with abend S0C4:

  -------             -----------
  PIDS/5655N0200      Program id: 5655N0200
  RIDS/BBOOPCRT#L     Load module name: BBOOPCRT
  RIDS/BBOCLSPC       Csect name: BBOCLSPC
  AB/S00C4            System abend code: 00C4
  PRCS/00000010       Abend reason code: 00000010
  REGS/C36C0          Register/PSW difference for R0C:-36C0
  RIDS/BBOCLSPC#R     Recovery routine csect name: BBOCLSPC

PSW@ points to instruction E50EE000 in this module:
BBOOPCRT11.29           H28W700
Local Session PC       .LSPCMAIN

Instruction E50EE000  ==>  => MVCSK R14,R0
Bad pointer in R14 - 7FFFFFFF

Traceback for the failing TCB:
 Entry       E  Offset  Statement   Load Mod
 CALLWOLV    +000008DC              CALLWOLV
 IGZCFCC     +000002C0              IGZCPAC
 CJTSTMAI    +00001C5A              CJTSTPSB
 CEEBPCAS    +00000D0E              CEEPIPI

This APAR will also provide  improved return/reason code
indicating that the data pointer or length passed to WOLA
BBOA1INV API is likely bad.

Local fix

Modify the application to send the proper message length.

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server V7.0 and V8.0                        *
****************************************************************
* PROBLEM DESCRIPTION: A ABEND in BBOCLSPC lead to the leak    *
*                      of LSCBs and dataspace cells in a       *
*                      WebSphere Application Server for z/OS   *
*                      Control region.                         *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
A WebSphere Optimized Local Adapter (WOLA) request (BBOA1INV),
with an incorrect parameter value, may cause an ABEND in the
WebSphere local communication PC routine--bboclspc.
An ABEND within the Local communication PC routine may cause it
to leak storage.   There may be a leak of LSCBs (BBOCLSCB) and
dataspace cells (dspname of "BBOCOMM") that the local
communication code uses to process requests.
An ABENDS0C4/ABEND0C4 can occur in the CopyStorage routine in
BBOCLSPC.  If the previous call to ObtainStorage failed to
return storage (either a pointer to a dataspace cell or a
pointer to above the bar storage), then the CopyStorage routine
will ABEND.  There is no check against the returned pointer.

Problem conclusion

Code has been modified to add more recovery code to track and
release the allocated dataspace cells and allow for the freeing
of LSCBs.

APAR PM59352 is currently targeted for inclusion in
WebSphere Application Server V7.0 Fix Pack 7.0.0.25 and
WebSphere Application Server V8.0 Fix Pack 8.0.0.4.

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
PM59352
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
2012-02-29
Closed date
2012-03-13
Last modified date
2012-11-02

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
WEBSPHERE FOR Z
Fixed component ID
5655I3500

Applicable component levels

R700 PSY UK81738
UP12/10/04 P F210

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:
28 October 2021

Tips

PM59352: ABEND S0C4 WHEN RUNNING HIGH WORKLOADS WITH WOLA; LSCB leak

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 UK81738

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

Share your feedback

Need support?