PI63625: 0C4 ABEND IN SERVANT BECAUSE A 64 BIT HEAPPOOL 1 ELEMENT WAS OVE RLAID.

Fixes are available

APAR status

Closed as program error.

Error description

0c4 abend in servant because a 64 bit heappool 1 element was
overlaid when reading data using a ReadListener on an upgraded
Servlet 3.1 request.
Overlay happens in code called by native routine
ntvXMemProxySrRead. ntvXMemProxySrRead is called by
com/ibm/ws390/xmem/proxy/XMemProxySRCppUtilities.xmemProxySrRead
Most of the time the abend occurs when
XMemProxySRCppUtilities.xmemProxySrRead goes native to write
it's exit trace.

  Traceback:
    DSA      Entry       E  Offset  Statement   Load Mod
    1        CELQVGQT    +00000806              Exception
    2        strdup      +00000042
    3        CvtAndPrint(JNIEnv_*,conversion_buffer_data&,
                         _jstring*,char*)
    4        Java_com_ibm_ejs_ras_CB390TraceEventListener_
             writeTrace
    5        RUNJAVATHREAD

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server V9.0 for z/OS                        *
****************************************************************
* PROBLEM DESCRIPTION: WebSphere Application Server for z/OS   *
*                      Servant encounters ABEND0C4/ABENDS0C4   *
*                      reason code 38 when reading data using  *
*                      a ReadListener on an upgraded Servlet   *
*                      3.1 request.                            *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
ABEND0C4/ABENDS0C4 reason code 38 occurs in CELQVGQT because of
an earlier overlay of a native 64 bit heappool 1 element.
When XMemProxySRCppUtilities.xmemProxySrRead goes native
and encounters a response length of zero, 256 bytes are
copied back which writes into its heappool 1 element and
also overlays the following heappool 1 element.
Example of overlay
Cell address: 00000048097713C0 Has incorrect Pool Number.
Previous cell address: 0000004809771340
Cell address: 0000004809771440 Has incorrect Pool Number.
Previous cell address: 00000048097713C0
ASID(X'0059') ADDRESS(48_09771340.) STORAGE --------
_9771340   00000000   00000001   00000000   00000001
_9771350   30504343   01000000   00000984   6173652F
_9771360   41707053   65727665   722F7072   6F66696C
_9771370   65732F64   65666175   6C742F70   726F7065
_9771380   72746965   73009699   87000089   97A28500
_9771390   00000000   00000001   00000000   00000001
_97713A0.:48_097713AF. LENGTH(X'10')--All bytes contain X'00'
_97713B0   00000000   6D656E74   00000048   08A2DC70
_97713C0   D0C54652   89DEDBD1   D0C54652   89DEDBD1
_97713D0   F0F0F0F0   F0F0F6F5   00706C00   D5C600E0
_97713E0   00000000   00000001   00000000   00000001
_97713F0   4D455441   2D494E46   2F747261   63652E78
_9771400   6D6C0053   65727665   722F706C   7567696E
_9771410   732F6A61   7661782E   6A326565   2E6A6163
_9771420   632E6A61   72006172   00930000   00000000
_9771430   00000000   00000001   00000000   00000001
_9771440   4D455441   2D494E46   2F4D414E   49464553
_9771450   BADBAD67   C40A212C   00000000   00000011
_9771460   00000000   7CB57422   00000048   0B13EC28
_9771470   00000000   00000011   30303030   30303635
_9771480   00DDDDDD   DDDDDDDD   BADBAD21   C40A21B2
_9771490   00000000   00000011   00000000   7CB57422
_97714A0   00000048   0B13EC28   00000048   0B13E868
_97714B0.:48_097714BF. LENGTH(X'10')--All bytes contain X'00'
_97714C0   00000000   00000001   00000000   00000001
_97714D0   00000000   008CA768   00000000   7EC80948
CAPTURED DUMPS=0002, SPACE USED=00001855M, SPACE
FREE=00001145M
DUMPID=001 TITLE=COMPON=WEBSPHERE Z/OS,
COMPID=5655I3500,
ISSUER=BBORLEXT,ABEND IN (MODULE NAME NOT
KNOWN)
DUMP TAKEN TIME=07.09.52 DATE=05/20/2016
ERRORID=SEQ06911 CPU0000 ASID0059 TIME=07.09.52
SYSTEM ABEND CODE=0C4  REASON CODE=00000038
MODULE=CBSERIES CSECT=CBSERIES
PSW AT TIME OF ERROR=07852401 80000000 00000000 0D4A3C76
ILC=6 INT=38
TRANSLATION EXCEPTION ADDR=2E436F72_62614800
ABENDING PROGRAM ADDR=02F004F8 RECOVERY ROUTINE=BBORLEXT
GPR 0-3   00000010  00000010  42DFD3C8  00000010
GPR 4-7   42BF99A0  0D4A41F8  0D4A3470  0D420E3C
GPR 8-11  00071524  00000000  00071523  6261436F
GPR12-15  19500300  19500230  0000005D  00000070
Traceback:
DSA      Entry       E  Offset  Statement   Load Mod
1        CELQVGQT    +00000806              Exception
2        strdup      +00000042
3        CvtAndPrint(JNIEnv_*,conversion_buffer_data&,
_jstring*,char*)
+000003AC
4        Java_com_ibm_ejs_ras_CB390TraceEventListener_
writeTrace
+0000031A
5        RUNJAVATHREAD
+00000000
6        javaProtectedThreadProc
+00000186
7        j9sig_protect
+0000063C
8        javaThreadProc
+00000072
9        thread_wrapper
+00000892
10       CELQPCMM    +00000F80
Java callstack:
at com/ibm/ejs/ras/CB390TraceEventListener.writeTrace(
Native Method)
at com/ibm/ejs/ras/CB390TraceEventListener.processEvent(
CB390TraceEventListener.java:373(Compiled Code))
at com/ibm/ws/logging/WsHandlerWrapper.publish(
WsHandlerWrapper.java:43(Compiled Code))
at java/util/logging/Logger.log(
Logger.java:749(Compiled Code))
at com/ibm/ejs/ras/Tr.logToJSR47Logger(
Tr.java:1754)
at com/ibm/ejs/ras/Tr.fireEvent(
Tr.java:1709)
at com/ibm/ejs/ras/Tr.fireTraceEvent(
Tr.java:1628)
at com/ibm/ejs/ras/Tr.exit(Tr.java:921)
at com/ibm/ws390/xmem/proxy/XMemProxySRCppUtilities.
xmemProxySrRead(XMemProxySRCppUtilities.java:347)
at com/ibm/ws390/xmem/proxy/XMemProxySRComm.readFromCr(
XMemProxySRComm.java:159)
at com/ibm/ws390/xmem/proxy/channel/
XMemProxySRTCPReadRequestContext.readCommon(
XMemProxySRTCPReadRequestContext.java:266)
at com/ibm/ws390/xmem/proxy/channel/
XMemProxySRTCPReadRequestContext.read(
XMemProxySRTCPReadRequestContext.java:124)
at com/ibm/ws/webcontainer/upgrade/
WCCUpgradeInputStream.isReady(
WCCUpgradeInputStream.java:113)
at com/ibm/ws/fat/wc/LibertyReadWriteListenerTest/servlet31/
upgradeHandler/TestUpgradeReadListener.
onDataAvailable(TestUpgradeReadListener.java:59)
at com/ibm/ws/webcontainer/upgrade/UpgradeReadCallback.
complete(UpgradeReadCallback.java:85)
at com/ibm/ws390/xmem/proxy/channel/
XMemProxySRTCPReadRequestContext$1.run(
XMemProxySRTCPReadRequestContext.java:372)
at com/ibm/ws/util/ThreadPool$Worker.run(
ThreadPool.java:1892)

Problem conclusion

Updated the code to not copy when the length is zero.

APAR PI63625 is currently targeted for inclusion in Fix Pack
9.0.0.1 of WebSphere Application Server V9.0.

Please refer to the Recommended Updates page for delivery
information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980

Temporary fix

Comments

APAR Information

APAR number
PI63625
Reported component name
WEBSPHERE FOR Z
Reported component ID
5655I3500
Reported release
900
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-06-07
Closed date
2016-06-09
Last modified date
2016-06-09

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

R900 PSY
UP

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

Document Information

Modified date:
04 May 2022

Tips

PI63625: 0C4 ABEND IN SERVANT BECAUSE A 64 BIT HEAPPOOL 1 ELEMENT WAS OVE RLAID.

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

R900 PSY

Document Information

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