VM66529: GUESTS ISSUING DIAGNOSE X'204' MAY HANG

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Guests who issue a DIAGNOSE x'204' instruction may hang in some
  cases.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All z/VM users                               *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
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  A guest may hang if diagnose x'204' simulation cannot get
  a block of free storage with enough contiguous pages.
  

Problem conclusion

• Processing of diagnose x'204' simulation in HCPHDS is changed
  to use a buffer obtained at CP initialization time.
  

Temporary fix

• *********
  * HIPER *
  *********
  FOR RELEASE VM/ESACP/ESAR710 :
  PREREQ: VM66283
  CO-REQ: NONE
  IF-REQ: NONE
  FOR RELEASE VM/ESA CP/ESA R720 :
  PREREQ: VM66173
  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:

  UM35876 UM35877

Modules/Macros

• HCPCACHE HCPHDS   HCPISU   HCPOFI   HCPVSD   HCPWDATA
  

Fix information

• Fixed component name

  VM CP CP

• Fixed component ID

  568411202

Applicable component levels

• R710 PSY UM35876

     UP21/07/07 P 2201 ¢

• R720 PSY UM35877

     UP21/07/07 P 2201 ¢

Fix is available

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