PM29466: INTERMITTENT SOC4 IN 64-BIT WEBSPHERE FOR Z/OS CONTROL REGION

Fixes are available

APAR status

Closed as program error.

Error description

WebSphere for z/OS servers running 64-bit may encounter
intermittent S0C4 ABENDs in the Control Region when processing
an IIOP request. The corresponding SVCDUMP may show the
following stack trace and corrupted DSA chain:
--
DSA Entry E Offset Statement Load Mod  Program Unit    Service
Status

1   bbooeqgq(ENQ_DEQ_RName*,SEQUENCE_octet*,int,int,int,int*,int
                +00000708              *PATHNAM          CF13103
Call
2   BBO_BOA::checkTransactionAffinity(ORB_Request*,AffinityRestr
                +000006E0              *PATHNAM          CF13103
Call
WARNING  An invalid DSA pointer was found on traceback while
processing DSA: 0000000A_85CF5F60 and CAA: 0000000A_85EFECF0

DSA DSA Addr E Addr PU Addr PU Offset Comp Date Compile Attribut
1        0000000A_85CF4520  00000000_7CA0EB50  00000000_00000000
+7CA0F2580  20101001   C/C++     POSIX XPLINK EBCDIC  IEEE
2        0000000A_85CF4920  00000000_7C859C78  00000000_00000000
+7C85A3580  20101001   C/C++     POSIX XPLINK EBCDIC  IEEE

WARNING  An invalid DSA pointer was found on traceback while
processing DSA: 0000000A_85CF5F60 and CAA: 0000000A_85EFECF0
--

Often the server terminates happens due to a S0C4 on a
different TCB a few seconds later. For example:
--
TCB 8cb598
Dsa         Entry      Offset     Function
---         -----      ------     --------
9bfcf7f20   1ad36d80   000077e8   CELQDMDR
9bfcf99c0   1ad4e678   00001364   CEEKDUMP
9bfcfa2e0   1ae1b0c8   000047d4   CEEHDSP
9bfcfcc00   1b01b620   000013e2   CEEOSIGG
9bfcfda20   1ae2f3c8   00000392   CEEHSGL
9bfcfdcc0   1ae2fec0   00000068   CEEHSGLT
9bfcfdee0   1aecfb18   00001946   CEEOPCB
9bfcfe260   1b17f000   0000003e   pthread_cond_broadcast
9bfcfe360   1d43de28   000001b2   j9thread_monitor_notify
9bfcfe460   1d390700   00c54728   RUNJAVATHREAD
9bfcfe8a0   1d409580   000000e0   javaProtectedThreadProc
9bfcfe9a0   1d4ad268   0000071a   j9sig_protect
9bfcff1a0   1d40c0b8   00000072   javaThreadProc
9bfcff2a0   1d43b5e0   0000051c   thread_wrapper
9bfcff3a0   1aed60d8   00000f56   CELQPCMM
--

However Logrec should show the first S0C4 to be from function
bbooeqgq(ENQ_DEQ_RName*,SEQUENCE_octet*,int,int,int,int*,int

Local fix

Run servers in 31-bit to avoid this problem

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server V6.1.0                               *
****************************************************************
* PROBLEM DESCRIPTION: ABEND0C4/ABENDS0C4 in WebSphere for     *
*                      z/OS controller in glue routine         *
*                      bbgqeqgq.cpp.                           *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
The glue routine is invoked within the 64-bit controller
to invoke the 31-bit routine bbooeqgq.plx to determine, based
on transaction affinity, if an inbound IIOP request should
receive a forwarding IOR or be processed by the current server.

An uninitialized parameter, representing a forwarding IOR
length, resulted in the glue routine moving a very large amount
of storage from the 31 bit heap area to the caller supplied
output IOR area; within the C++ call stack storage.  This
corrupted the call stack storage as well as resulted in an
ABEND 0C4 within the glue routine.

Problem conclusion

Code has been modified within the bbgqeqgq.cpp glue routine to
initialize the IOR length parameter prior to the call to the
31-bit bbooeqgq.plx routine.  Routine bbooeqgq only sets the
IOR length parameter if intending to pass back a forwarding IOR
to the caller.

APAR PM29466 is currently targeted for inclusion in Service
Level (Fix Pack) 6.1.0.37 of WebSphere Application Server V6.1.

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
PM29466
Reported component name
WEBSPHERE FOR Z
Reported component ID
5655I3500
Reported release
610
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2010-12-23
Closed date
2011-01-07
Last modified date
2011-05-02

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

PM29467

Fix information

Fixed component name
WEBSPHERE FOR Z
Fixed component ID
5655I3500

Applicable component levels

R610 PSY UK65883
UP11/04/06 P F104

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":"6.1","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
27 October 2021

Tips

PM29466: INTERMITTENT SOC4 IN 64-BIT WEBSPHERE FOR Z/OS CONTROL REGION

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

R610 PSY UK65883

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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