VM66360: HANG LOGICAL DEVICE HOST AFTER DIAG 7C TERMINATE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• TCPIP HUNG. A Logical Device host can hang following a Diagnose
  x'7C' Terminate function issued for a dialed logical device.
  In this case one ldev is dialed to another.  The dialed to ldev
  issued the RESET for the dialed ldev.  This caused CP to destroy
  the dialed ldev.  Before the destroy processing completed the
  logical device host issued a Diagnose x'7C' Terminate, causing
  the logical device host to become hung in simulation wait.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of z/VM Logical Device Support     *
  *                 Facility.                                    *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  TCPIP hung while terminating a logical device with a Diagnose
  X'7C' Terminate function.  The logical device getting terminated
  was dialed to another logical device.  The Diagnose X'7C'
  Terminate occurred while the same logical device was being
  destroyed as a result of a RESET command.  The RESET command
  processing turned off the RDEVDED bit in the logical RDEV.
  Before the destroy processing completed the terminate
  processing continued to HCPLDADR.  In HCPLDADR, the processing
  did not take the path for dialed devices because the RDEVDED
  bit was off.  Instead, dispatching was switched to the logical
  device user and HCPQCNSY was called to quiesce all terminal
  activity while TCPIP was in simulation-wait.  We never returned
  from HCPQCNSY, leaving TCPIP hung.
  

Problem conclusion

• HCPDIUDR was changed to set a new bit in the RDEV when the
  RDEVDED bit is turned off.  This new bit is checked in HCPLDADR.
  When this bit is on processing will take the dialed device
  path, and HCPQCNSY will not be called.
  

Temporary fix

• FOR RELEASE VM/ESA CP/ESA R640 :
  PREREQ: VM66258 VM66095
  CO-REQ: NONE
  IF-REQ: NONE
  FOR RELEASE VM/ESACP/ESAR710 :
  PREREQ: VM66258 VM66219
  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:

  UM35601 UM35602

Modules/Macros

• HCPDIU   HCPLDA   HCPLDDBK HCPRDEV
  

Fix information

• Fixed component name

  VM CP

• Fixed component ID

  568411202

Applicable component levels

• R640 PSY UM35601

     UP20/03/05 I 1000

• R710 PSY UM35602

     UP20/03/05 P 2101

Fix is available

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