OW25902: LOOP RE-DISPATCHING NCB PC PAB (ISTTSCWS) FOR ICNCB. RPH WORK ELEMENT IS NOT BEING REMOVED FROM THE PAB.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Loop re-dispatching the same work element (RPH) on the NCB PC
  PAB (ISTTSCWS). RPH is not being processed because flag
  ICNWQFLG is on. It appears that there was an abend in OEM
  code earlier that caused ICNWQFLG to be left on.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All using LOCAL SNA connections.             *
  ****************************************************************
  * PROBLEM DESCRIPTION: An ABEND occurs while processing in     *
  *                      ISTTSCWS.  VTAM is then in an infinite  *
  *                      loop redispatching the NCB PC PAB       *
  *                      (ISTTSCWS).                             *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Module ISTTSCWS was called while processing under a TSOP.  An
  ABEND occurred after ISTTSCWS set ICNWQFLG on.  Module
  ISTZRM01 was called for error recovery.  Module ISTZRM01
  hit an ABEND0C4 while saving the UCB prefix for the channel
  being recovered.
  The ABEND in ISTZRM01 caused ISTAPCFR to gain control and
  do further error recovery.  The various abends caused the
  NCB to be cleaned up for this channel.  The NCB PU PAB
  was cleaning up and queued it's running RPH to the
  NCB PC PAB.
  ISTTSCWS (NCB PC PAB) was dispatched with the RPH as a WKE.
  Since ICNWQFLG was left on do to the earlier abend, the
  module exits without removing the RPH WKE from the PAB.
  When ISTTSCWS exits, PSS reschedules the PAB to be
  dispatched.  This is an infinite loop since the RPH is
  never removed from the PC PAB work queue.
  

Problem conclusion

• Module ISTZRM01 has been modified to turn ICNWQFLG off during
  error recovery.  This will prevent the infinite loop in
  the NCB PC PAB.
  Module ISTZRM01 has been modified to remove code which was
  saving off the UCB prefix during error recovery.  This code
  was unnecessary and has been deleted.
  

Temporary fix

• AW25902 is available from the support center until a formal PTF
  is available.
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UW37224 UW37225 UW37226

Modules/Macros

• ISTZRM01
  

Fix information

• Fixed component name

  VTAM V4 MVS/ESA

• Fixed component ID

  569511701

Applicable component levels

• R201 PSY UW37224

     UP97/05/02 P F705 Ž

• R301 PSY UW37225

     UP97/05/02 P F705 Ž

• R401 PSY UW37226

     UP97/05/02 P F705 Ž

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.