PM37701: INTERMITTENT CORE DUMP OCCURS WHEN DISCONNECTING WTX DB2 DATABASE ADAPTER CONNECTION RUNNING UNDER MESSAGE BROKER

APAR status

• Closed as program error.

Error description

• Intermittent core dump occurs when disconnecting WTX DB2
  Database Adapter connection running under Message Broker.
  
  The following stack trace is from the failing thread:
  
  #14 0x0000020001427300 in SQLFreeEnv () from
  /usr/WMB70/lib/libbipodbc.so
  #15 0x000002001b205260 in FreeSqlEnv () from
  /usr/WSDTX/libs/libm4db2.so
  #16 0x000002001b21901c in DBS_CleanupConnection () from
  /usr/WSDTX/libs/libm4db2.so
  #17 0x000002001b219466 in DBS_FreeConnection () from
  /usr/WSDTX/libs/libm4db2.so
  #18 0x000002001af3c52a in DBDisconnect () from
  /usr/WSDTX/libs/libdbutil.so
  #19 0x000002001a3bd294 in CMpiUserConnection::Disconnect() from
  /usr/WSDTX/libs/libdstxpi.so
  #20 0x000002001a3cc59c in mpiConnectionDisconnect () from
  /usr/WSDTX/libs/libdstxpi.so
  #21 0x000002001aa33f62 in _AdapterDisconnect () from
  /usr/WSDTX/libs/libmercrmgr.so
  #22 0x000002001aa35748 in InvokeAdapterMethod () from
  /usr/WSDTX/libs/libmercrmgr.so
  #23 0x000002001aa35946 in RMThread () from
  /usr/WSDTX/libs/libmercrmgr.so
  

Local fix

• WTXCQ - WTX00037419
  LV / LV
  Circumvention: None
  

Problem summary

• Users Affected:
  WebSphere Transformation Extender Launcher, WESB or Message
  Broker installation that is employing maps that perform DB2
  operations.
  
  Problem Description:
  In Message Broker environments, the DB2 adapter causes a
  crash whenever disconnecting from the very last DB2 connection.
  The same problem can be seen in other WTX environments if both
  DB2 and ODBC adapters are used at the same time.
  
  Platforms Affected:
  Linux, zLinux
  

Problem conclusion

• The 64-bit DB2 adapter on Linux and zLinux properly disconnects
  from the very last DB2 connection.  Prior to this fix, when
  running WTX and attempting to disconnect from the last DB2
  connection, the DB2 Adapter invoked the wrong library function
  (SQLFreeEnv).  Now the DB2 adapter invokes the same function,
  but within the DB2 driver library versus the Broker's ODBC
  library or IDBC driver library.
  
  Delivered in:
  8.2.0.6, 8.3.0.5
  

Temporary fix

Comments

APAR Information

• 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

  WTX FOR INT SER

• Fixed component ID

  5724M4010

Applicable component levels

• R820 PSY

     UP

• R830 PSY

     UP