VM64952: PEVM65680 ABENDHTT001 RELOCATING GUEST IN CPU POOL

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• ABENDHTT001 occurs because of code added to the relocation path
  in APAR VM65680.  This abend might occur on a target system
  for any relocation of a guest virtual machine that is in a CPU
  Pool for the purpose of limiting its CPU usage, depending
  on the state of the scheduler lock at the time the code is
  executing.
  

Local fix

• Do not perform relocations of guests in a CPU POOL, or
  remove the guest from the POOL prior to relocating it.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: z/VM users relocating of a guest virtual     *
  *                 machine that is in a CPU Pool.               *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  The code added to the relocation path by the multithreading
  prorated core time support and shipped in the APAR VM65680 can
  cause an ABENDHTT001.  This abend might occur on the target
  system for any relocation of a guest virtual machine that is
  in a CPU Pool for limiting its CPU usage.  Basically, the
  problem is that the added code used a 32-bit load instruction
  to load the address of a control block into R15 in a 64-bit
  addressing mode and there was non-zero data in the high half of
  the register.  As soon as R15 was used to address the control
  block, the abend occurred.  The case of non-zero data in the
  high half of R15 is dependent on the state of the scheduler lock
  at the time the code is executing.  If the high half of R15
  does not get altered when obtaining the scheduler lock, the
  abend will not occur.
  

Problem conclusion

• The code added to the relocation path by the APAR VM65680 has
  been fixed to use the load logical thirty one bits instruction
  instead of the 32-bit load instruction to clear the high half
  of R15.  ABENDHTT001 does not occur any more with the fix.
  

Temporary fix

• *********
  * HIPER *
  *********
  FOR RELEASE VM/ESA CP/ESA R630 :
  PREREQ: VM65680 VM65418
  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:

  UM34583

Modules/Macros

• HCPRLG
  

Fix information

• Fixed component name

  VM CP

• Fixed component ID

  568411202

Applicable component levels

• R630 PSY UM34583

     UP16/03/30 P 1601 «

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.