When insert large XML documents, DB2 fails with SQL0901N error
or instance crash.
The problem is due to a memory corruption where XML data block
is being overwritten.
This cause SQL0901N or instance crash. Trap stacks can look
different but in general they're all in XML processing.
Samples are pasted below:
For -901 error, sample db2diag.log shows:
-901 error:
FUNCTION: DB2 UDB, XML Node Manager,
XmlrnConstructorEndDocument, probe:668
MESSAGE : ZRC=0x82A40001=-2103181311=XMLRN_PRG_ERR
"XMRN unexpected system error"
DIA8532C An internal processing error has occurred.
DATA #1 : String, 64 bytes
EndDocument must be called with only document node on the stack.
DATA #2 : Xmlrn Fragment Writer object,
PD_TYPE_XMRN_FRAGMENT_WRITER, 824 bytes
XmlrnConstructorWriter:
m_flags: 0x498
m_bufferSize: 32640
m_inlineOffset: 0
m_nodeMgr address: 0x07000000e1ffb560
m_xmlDD address: 0x07000000e1ffb860
m_nsHdr address: 0x0000000000000000
m_node address: 0x0000000000000000
m_preserveNids: true
m_localBuffer address: 0x07000000337f7080
m_stack address: 0x0700000033c93d00
m_stackSize: 16
m_stackPos: 1
m_tempRecordLength: 32640
XmlrnConstructorWriter m_updateState follows:
XmlrnConstructorState:
..
CALLSTCK: (Static functions may not be resolved correctly, as
they are resolved to the nearest symbol)
[0] 0x090000000AFED2D4 endDocument__16XmlrnConstructorFv +
0x258
[1] 0x090000000A25E61C
addDescendantSubtree__16XmlrnConstructorFP17xmlDataDescriptorb +
0x924
[2] 0x090000000A25DB98
copySubtree__16XmlrnConstructorFP17xmlDataDescriptorP12XmlrnNode
MgrUlUsT1bP17XmlsNidDescriptor + 0x17C
[3] 0x090000000A2AE988
deepCopy__17xmlDataDescriptorFP11XMLSTORE_CBP17xmlDataDescriptor
Ui + 0x9D8
[4] 0x090000000AF255DC
prepareForTransport__17xmlDataDescriptorFP11XMLSTORE_CBUiUsP25sq
lktLargeObjCacheGatewayi + 0xB04
[5] 0x0900000009DFEA84
sqlrk_RPCRecvFetchXDM__FP8sqlrr_cbUiR16SqlrkXmlRpcReply + 0x538
[6] 0x0900000009DFB088
sqlrk_xml_router__FP8sqlrr_cbR16SqlrkXmlRpcReplyP16sqlkdRqstRply
FmtP15SQLR_RPCMESSAGEb + 0x400
[7] 0x09000000099844C0 sqlrr_rpc_router__FP8sqlrr_cb + 0xECC
[8] 0x090000000998160C
sqlrr_subagent_router__FP8sqeAgentP12SQLE_DB2RA_T + 0x848
[9] 0x0900000009982368
@82@sqleSubRequestRouter__FP8sqeAgentPUiPUl + 0x3B4
[10] 0x0900000009B66684 sqleProcessSubRequest__FP8sqeAgent +
0x470
[11] 0x09000000096F9858 RunEDU__8sqeAgentFv + 0x680
[12] 0x09000000096F33CC EDUDriver__9sqzEDUObjFv + 0x13C
[13] 0x09000000096F3254 sqlzRunEDU__FPcUi + 0x10
[14] 0x0900000009706000 sqloEDUEntry + 0x264
[15] 0x090000000079AC90 _pthread_body + 0xF0
[16] 0xFFFFFFFFFFFFFFFC ?unknown + 0xFFFFFFFF
FUNCTION: DB2 UDB, XML Node Manager,
XmlrnConstructorEndDocument, probe:668
MESSAGE : ZRC=0x82A40001=-2103181311=XMLRN_PRG_ERR
"XMRN unexpected system error"
DIA8532C An internal processing error has occurred.
DATA #1 : String, 4 bytes
none
CALLSTCK: (Static functions may not be resolved correctly, as
they are resolved to the nearest symbol)
[0] 0x0900000009B97470 xmlrnLogErrorRc__FUliT2Pc + 0xFC
[1] 0x090000000AFED2E8 endDocument__16XmlrnConstructorFv +
0x26C
[2] 0x090000000A25E61C
addDescendantSubtree__16XmlrnConstructorFP17xmlDataDescriptorb +
0x924
[3] 0x090000000A25DB98
copySubtree__16XmlrnConstructorFP17xmlDataDescriptorP12XmlrnNode
MgrUlUsT1bP17XmlsNidDescriptor + 0x17C
[4] 0x090000000A2AE988
deepCopy__17xmlDataDescriptorFP11XMLSTORE_CBP17xmlDataDescriptor
Ui + 0x9D8
[5] 0x090000000AF255DC
prepareForTransport__17xmlDataDescriptorFP11XMLSTORE_CBUiUsP25sq
lktLargeObjCacheGatewayi + 0xB04
[6] 0x0900000009DFEA84
sqlrk_RPCRecvFetchXDM__FP8sqlrr_cbUiR16SqlrkXmlRpcReply + 0x538
[7] 0x0900000009DFB088
sqlrk_xml_router__FP8sqlrr_cbR16SqlrkXmlRpcReplyP16sqlkdRqstRply
FmtP15SQLR_RPCMESSAGEb + 0x400
[8] 0x09000000099844C0 sqlrr_rpc_router__FP8sqlrr_cb + 0xECC
[9] 0x090000000998160C
sqlrr_subagent_router__FP8sqeAgentP12SQLE_DB2RA_T + 0x848
[10] 0x0900000009982368
@82@sqleSubRequestRouter__FP8sqeAgentPUiPUl + 0x3B4
[11] 0x0900000009B66684 sqleProcessSubRequest__FP8sqeAgent +
0x470
[12] 0x09000000096F9858 RunEDU__8sqeAgentFv + 0x680
[13] 0x09000000096F33CC EDUDriver__9sqzEDUObjFv + 0x13C
[14] 0x09000000096F3254 sqlzRunEDU__FPcUi + 0x10
[15] 0x0900000009706000 sqloEDUEntry + 0x264
[16] 0x090000000079AC90 _pthread_body + 0xF0
[17] 0xFFFFFFFFFFFFFFFC ?unknown + 0xFFFFFFFF
Since the root cause is memory corruption, it might cause
instance trap with different
stacks like below:
0x09000000093B69D0 sqlofmblkEx + 0x168
0x0900000009DDC3B0 __dt__16XmlrnConstructorFv + 0x124
0x090000000A25DB64
copySubtree__16XmlrnConstructorFP17xmlDataDescriptorP12XmlrnNode
MgrUlUsT
1bP17XmlsNidDescriptor + 0x148
0x090000000A2AE988
deepCopy__17xmlDataDescriptorFP11XMLSTORE_CBP17xmlDataDescriptor
Ui +
0x9D8
0x090000000AF255DC
prepareForTransport__17xmlDataDescriptorFP11XMLSTORE_CBUiUsP25sq
lktLarge
ObjCacheGatewayi + 0xB04
0x0900000009DFEA84
sqlrk_RPCRecvFetchXDM__FP8sqlrr_cbUiR16SqlrkXmlRpcReply + 0x538
0x0900000009DFB088
sqlrk_xml_router__FP8sqlrr_cbR16SqlrkXmlRpcReplyP16sqlkdRqstRply
FmtP15SQ
LR_RPCMESSAGEb + 0x400
0x09000000099844C0 sqlrr_rpc_router__FP8sqlrr_cb + 0xECC
0x090000000998160C
sqlrr_subagent_router__FP8sqeAgentP12SQLE_DB2RA_T +
0x848
0x0900000009982368 @82@sqleSubRequestRouter__FP8sqeAgentPUiPUl +
0x3B4
0x0900000009B66684 sqleProcessSubRequest__FP8sqeAgent + 0x470
0x09000000096F9858 RunEDU__8sqeAgentFv + 0x680 |
