PI12616: "BLOCK HEADER INVALID, POSSIBLE MEMORY OVERWRITE" EXTRANEOUS MESSAGE WHEN KILLING DSMCAD ON USS CLIENT

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Tivoli Storage Manager USS client can report extraneous message
  in dsmerror.log like:
  
  
  Block header invalid, possible memory overwrite.   Addr
  19051F08, File ./thrdmgr.cpp, Line 664
  
  ./dsmem.cpp         ( 930): Block header invalid,  possible
  memory overwrite. Addr 19051F08, File ./thrdmgr.cpp, Line 664
  
  if dsmcad is stopped with a kill command (manually or by a tool
  like System Automation).
  
  ie
  kill <dsmcad process id>
  
  The messages being reported have no consequences and can be
  ignored.
  
  Tivoli Storage Manager Versions Affected:
  Tivoli Storage Manager Client for USS version 6.1.x
  
  Initial Impact:  Low
  
  Additional Keywords:
  zz61 USS dsmcad stop kill
  

Local fix

• Use 'kill -9 <dsmcad process id>' to stop the dsmcad process
  if the messages are undesired.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All UNIX System Services users running the   *
  *                 CAD (dsmcad) may be affected.                *
  ****************************************************************
  * PROBLEM DESCRIPTION: See ERROR DESCRIPTION                   *
  ****************************************************************
  * RECOMMENDATION: Apply fixing level when available.  See      *
  *                 CIRCUMVENTION for a local work around.       *
  ****************************************************************
  The problem was caused by unique behavior of the fork()
  function on UNIX System Services.  The thread code in TSM
  needed to take this unique behavior into account
  

Problem conclusion

• The TSM thread code was modified to accomodate the unique
  behavior.
  

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:

  UI26801 UI26802

Fix information

• Fixed component name

  TSM FOR OS/390

• Fixed component ID

  5698ISMVS

Applicable component levels

• R612 PSY UI26801

     UP15/04/17 P F504

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.