VM66405: PEVM66265 ABENDHTT001 AT HCPMNYPP+1686 20/08/17 PTF PECHANGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• ABENDHTT001 can occur when running with monitor enabled
  on systems with less than 80 configurable cores.
  
  Other abends can also occur, including ABENDVAP002.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of z/VM running on a machine with less *
  *                 than 80 configurable processors with monitor *
  *                 enabled.                                     *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  Incorrect code in monitor can lead to a number of abend
  conditions in CP when running on a machine with less than 80
  configurable cores.
  
  In several monitor modules, the code uses a static equate to
  control a loop through alternate processor prefix pages.
  This equate corresponds with the z/VM supported limit on the
  maximum number of logical processors.
  
  In VM66265, a new constant was added which is the minimum of the
  z/VM supported limit on the maximum number of logical
  processors, and the partition supported limit on the maximum
  number of cores times the maximum threading level. This
  constant is used to allocate the storage for alternate
  processor prefix pages. When the partition supported
  limit on the number of cores is smaller than the z/VM
  support limit, this can lead the code in monitor to walk past
  the end of the prefix array. This may lead to a variety of
  abend conditions, including ABENDHTT001 and ABENDVAP002.
  

Problem conclusion

• Monitor code which loops through the alternate processor prefix
  array is updated to use the new constant so that the loop
  control matches the processor storage allocation.
  

Temporary fix

• *********
  * HIPER *
  *********
  FOR RELEASE VM/ESACP/ESAR710 :
  PREREQ: VM66265
  CO-REQ: NONE
  IF-REQ: NONE
  FOR RELEASE VM/ESA CP/ESA R720 :
  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:

  UM35719 UM35720

Modules/Macros

• HCPMNY   HCPMOM   HCPMOT
  

Fix information

• Fixed component name

  VM CP

• Fixed component ID

  568411202

Applicable component levels

• R710 PSY UM35719

     UP20/09/15 P 2101 ­

• R720 PSY UM35720

     UP20/09/15 P 2101 ­

Fix is available

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