IT22441: DB2 INSTANCE MAY TRAP DUE TO CORRUPTED FCM BUFFER

IT22441: DB2 INSTANCE MAY TRAP DUE TO CORRUPTED FCM BUFFER

https://www.ibm.com/mysupport/s/defect/aCI3p000000kFEH/dt158261?language=en_US

• Description

  On DPF environment, DB2 instance may trap due to receiving      
  corrupted FCM buffer.                                           
                                                                  
  db2diag has the following pattern of messages.                  
                                                                  
  EDUID   : 1286                 EDUNAME: db2fcmr 20              
  FUNCTION: DB2 UDB, fast comm manager,                           
  sqkfTcpServices::recvDataBuffer, probe:20                       
  RETCODE : ZRC=0x800F00FC=-2146500356=SQLO_INV_PARM "Invalid     
  input parameter"                                                
                                                                  
  EDUID   : 1286                 EDUNAME: db2fcmr 20              
  FUNCTION: DB2 UDB, fast comm manager,                           
  sqkfTcpServices::recvCommBuffer, probe:40                       
  RETCODE : ZRC=0x8159006A=-2124873622=SQLKF_COMM_FAIL "FCM       
  communications failed"                                          
                                                                  
                                                                  
  EDUID   : 1286                 EDUNAME: db2fcmr 15              
  FUNCTION: DB2 UDB, fast comm manager,                           
  sqkfFastCommManager::RouteInboundBuffer, probe:10               
  MESSAGE : Unexpected buffer type recvd =                        
                                                                  
                                                                  
  And the following stack can be shown.                           
                                                                  
  sqkfBufferManager::FreeBuffer(sqkfBuffer*)                      
  sqkfTcpServices::sendCommBuffer(sqkfBuffer*,sqkfDataTarget*)    
  sqlo_completion_queue.sqkfSendConduit::HandleRequests.fdpr.chunk
  .13(sql_static_data*)                                           
  sqkfSendConduit::RunEDU()                                       
  sqle_application.sqzEDUObj::EDUDriver()                         
  sqloEDUEntry                                                    
  Show less

• Problem summary

   

  ****************************************************************

  * USERS AFFECTED:                                              *

  * ALL                                                          *

  ****************************************************************

  * PROBLEM DESCRIPTION:                                         *

  * See Error Description                                        *

  ****************************************************************

  * RECOMMENDATION:                                              *

  * Upgrade to Db2 10.5 Fix Pack 10 or higher                    *

  ****************************************************************

   

• Problem conclusion

  First fixed in Db2 10.5 Fixpack 10                              

• Temporary workaround

  None.                 

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