VM65708: HTT001 ABEND IN HCPIOS WHILE USING SPXTAPE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• A guest issued an SPXTAPE command.  During the rewind of the
  tape an HTT001 abend occurred because the issuer had logged off.
  When the response to the rewind was received, HCPIOS referred
  to a VMDBK that no longer existed leading to the HTT001 ABEND.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of SPXTAPE on z/VM                 *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  ABENDHTT001 when a hardware issue hangs a tape disposition I/O
  operation (REWIND, REW and UNLOAD) to a tape drive at the end of
  an SPXTAPE command's processing.  All other processing for the
  command can complete prior to the disposition operation which is
  running asynchronously.  This frees up the user to logoff even
  though that last operation remains outstanding because of the
  hang.  Eventually the missing interrupt handler (MIH) detects
  the hang and the HTT001 abend can occur if the missing interrupt
  handler tries to access the VMDBK of the command issuer which
  has been released due to the logoff.
  

Problem conclusion

• The SPXTAPE command issuer's deferred work count (VMDDFRWK) is
  incremented just before the tape disposition operation is
  started and decremented when the operation completes.  This
  guarantees that the deferred work count is non-zero across the
  I/O operation and prevents the user from logging off.
  

Temporary fix

• *********
  * HIPER *
  *********
  FOR RELEASE VM/ESA CP/ESA R640 :
  PREREQ: NONE
  CO-REQ: NONE
  IF-REQ: NONE
  FOR RELEASE VM/ESA CP/ESA R710 :
  PREREQ: NONE
  CO-REQ: NONE
  IF-REQ: NONE
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UM35374 UM35375

Modules/Macros

• HCPSFR   HCPSPZ
  

Fix information

• Fixed component name

  VM CP

• Fixed component ID

  568411202

Applicable component levels

• R640 PSY UM35374

     UP19/06/05 P 2001 ¢

• R710 PSY UM35375

     UP19/06/05 P 1902 ¢

Fix is available

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