ORA-00600: internal error code, arguments: [15709]

Note: For additional ORA-600 related information please read Note 146580.1

PURPOSE:
  This article discusses the internal error "ORA-600 [15709]", what 
  it means and possible actions. The information here is only applicable 
  to the versions listed and is provided only for guidance.

ERROR:
  ORA-600 [15709] [a] [b] [c]
 
VERSIONS:
  versions 7.1 to 10.1

DESCRIPTION:

  This error is raised when there are problems with parallel query 
  processing while creating and shutting down query slave (server)
  processes.  

ARGUMENTS:

  The number of additional arguments vary between one and three
  depending on exactly which area of the code raises the internal error.

FUNCTIONALITY:      
  eXecute Fast (parallel) Process and buffer queue manager
 
IMPACT:             
  PROCESS FAILURE
  NON CORRUPTIVE - No underlying data corruption.

SUGGESTIONS:

  Increase the parallel_max_servers parameter in init.ora
  and retry the operation.

  If the Known Issues section below does not help in terms of identifying
  a solution, please submit the trace files and alert.log to Oracle
  Support Services for further analysis.
  
  Known Issues:

  Bug# 3256025   See Note 3256025.8
      OERI[15709] cleaning up dead PQ slaves
      Fixed: 9.2.0.5, 10.1.0.2
 
  Bug# 2362461   See Note 2362461.8
      OERI:[15709] possible due to PQ slave cleanup race condition
      Fixed: 9.2.0.2, 10.1.0.2
 
  Bug# 1615171   See Note 1615171.8
      OERI:15709 possible on rollback of PDML which takes > 32 minutes
      Fixed: 8.1.7.3, 9.0.1.0