VM66196: ABENDFRE016 ABENDLCK003 AND OTHERS DUE TO OVERLAY

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• A storage overlay involving a byte being OR'd with x'40' can
  result in Abend FRE016, LCK003, HTT001, or PRG001.
  
  The overlay can occur when the IPNLOCAL bit is turned on in
  IPNFLAGS after storage for the IPNBK has been released.  If
  the storage is reallocated before the IPNLOCAL bit is turned
  on an abend is likely to occur.  The type of abend depends
  on where the overlay occurs.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All z/VM customers using an IP (Layer 3)     *
  *                 VSwitch.                                     *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  When an IP (Layer 3) VSwitch is configured with duplicate
  IP addresses, a message similar to the following will be
  displayed:
  HCPSWU2833E Error 'E00A'X adding IP address 10.1.4.4 for
  VSWITCH SYSTEM VSW1
  A VSwitch configured with duplicate IP addresses may encounter
  a storage overlay which can result in ABEND FRE016, LCK003,
  HTT001, or PRG001. The overlay can occur when the IPNLOCAL bit
  is turned on in IPNFLAGS after storage for the IPNBK has been
  released.  If the storage is reallocated before the IPNLOCAL
  bit is turned on, an abend is likely to occur.
  

Problem conclusion

• In the failing code path, HCPIPNSS has encountered a SETIP
  error and is going to retry the SETIP.  For the first few
  retries, HCPVLCIP will be called immediately.
  After that, a 500ms delay will be added to avoid overwhelming
  the controller and/or OSA.  Before the wait, we release the
  LANBK, to allow data transfer. After the wait, we reacquire
  the LANBK.  During that window, the IPNBK may be released.
  HCPIPNSS has been changed to verify the validity of the IPNBK
  after we reacquire the LANBK. This will prevent setting the
  the IPNLOCAL bit in an IPNBK structure that has been released.
  

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:

  UM35396 UM35397

Modules/Macros

• HCPIPN
  

Fix information

• Fixed component name

  VM CP

• Fixed component ID

  568411202

Applicable component levels

• R640 PSY UM35396

     UP19/06/26 P 1901

• R710 PSY UM35397

     UP18/11/22 P 1901

Fix is available

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