PJ40237: TAPE PROBLEM WITH THE 3590 INTERRUPTION HANDLER LEADS TO A 64C00 DUMP

APAR status

• Closed as program error.

Error description

• See Problem Summary.
  

Local fix

• na
  

Problem summary

• APAR NUMBER:  PJ40237
  PRODUCT:  z/TPF
  FUNCTIONAL AREA:  TAPE I/O AND ERROR RECOVERY
  SHIPPED IN PUT:  10
  
  ABSTRACT:
  3590 channel-error recovery can exhaust system SWBs, causing a
  CTL-64C00 system error
  
  PACKAGE CONTENTS:
  Source Segments:
  (C) base/cp/cefe.cpy
  (C) base/cp/ceft.cpy
  (C) base/macro/dctirb.mac
  
  Object Only Binaries:
  None.
  
  Configuration Independent Binaries:
  None.
  
  Support Files:
  None.
  
  OTHER BINARIES TO BUILD: YES
  (C) <sys>/load/CPS0.so
  (C) <sys>/obj/cctape.o
  (C) os390/bin/amx1.pds
  (C) os390/bin/ppcp.pds
  (C) os390/bin/sadump.obj
  (C) os390/obj/amx1.o
  (C) os390/obj/ccmcdc.o
  (C) os390/obj/sadump.o
  (C) os390/obj/stpp.o
  
  COMMENTS:
  When an I/O interruption is received from a 3590 tape device
  indicating secondary status without primary status and one or
  more channel errors, control is eventually passed to routine
  CPMPNSTAT in segment CEFT of CP CSECT CCTAPE. If it is
  subsequently determined that the current interruption status
  must be merged with the status from the previous interruption,
  containing the primary status, control passes to BLDBASIRB.
  After merging the two interruptions, control is passed to
  routine LOCATECCW to re-process the merged interruption.
  However, since the logic prior to merging the two interruptions
  uses the current interruption status rather than the merged
  interruption status, it will again be determined that the two
  interruptions are to be merged, after which control is again
  passed to LOCATECCW, causing an infinite loop. As part of this
  processing, repeated executions of CXFRC macros will eventually
  cause the system to run out of SWBs, causing a CTL-64C00
  catastrophic system error.
  

Problem conclusion

• SOLUTION:
  The 3590 channel-error recovery routine in segment CEFT of CP
  CSECT CCTAPE has been modified to correctly merge primary- and
  secondary-status interruptions and continue processing, rather
  than returning to routine LOCATECCW to reprocess the merged
  interruption.
  
  COREQS: NO
  None.
  
  MIGRATION CONSIDERATIONS: NO
  None.
  
  BUILD COMMANDS AND INSTRUCTIONS: YES
  #maketpf commands for linux
  maketpf -f CPS0 cctape.o
  maketpf CPS0 link
  #maketpf commands for z/OS
  maketpf -f amx1 amx1.o
  maketpf -f ppcp ccmcdc.o stpp.o
  maketpf -f sadump sadump.o
  maketpf amx1 link
  maketpf ppcp link
  maketpf sadump link
  
  UPDATED INFORMATION UNITS: NO
  None.
  
  See your IBM representative if you need additional information.
  
  DOWNLOAD INSTRUCTIONS:
  http://www.ibm.com/software/htp/tpf/maint/maintztpf.html
  
  APAR URL:
  http://www.ibm.com/software/htp/tpf/ztpfmaint/put10/PJ40237.htm
  

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:

Fix information

• Fixed component name

  Z/TPF

• Fixed component ID

  5748T1501

Applicable component levels

• R110 PSY UP

     110