PH37683: IPIC PROCESSING STOPS CISR TASK STUCK IN SOCKET SEND AND OWNS ENQUEUE ISSSENQP

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• You are running CICS TS 5.3 and have a connection
  to a CTG via IPIC / IPCONN.
  It appears there is some issue between CICS and CTG such that
  CTG gives up on this IPCONN.  The console dump shows the CISR
  task is attempting to send a PONG response back but this hangs.
  The send only hangs when the TCPIP buffers on the CICS side have
  filled up.  That only happens when the client is no longer
  receiving any data.
  This APAR is being taken due to the CISR task getting stuck,
  which prevents all further IPIC processing.
  
  Additional symptoms: KIXREVCTC
  BAD_CONVID IS 0613 IS 0515
  INVALID_PARTNER_STATE INITIALIZE_CONNECTION
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: CICS is unable to process inbound IPIC  *
  *                      requests due to the CISR task being     *
  *                      stuck in a SOCKET SEND wait.            *
  ****************************************************************
  CICS has an inbound IPIC connection from CICS TG.  A PING
  request is received and the CISR task attempts to send the
  response directly back to the CICS TG.  For some unknown reason
  the CICS TG is no longer receiving any further data on the
  socket.  This has caused the TCPIP buffer on the CICS side to
  fill up and for the socket send issued by the CISR task to
  suspend.
  
  While the CISR task is suspended on this SOCKET SEND no other
  inbound IPIC requests can be processed in the region.  There is
  no timeout in effect for the suspend and CISR does not have a
  DTIMOUT value set.  This means that the CISR task can wait
  forever, stopping all further IPIC work in the region.
  

Problem conclusion

• CISR has been changed to only wait for up to 2 seconds when
  sending a PING response.  If the SOCKET SEND call for the PING
  response does not complete within the time then the IPCONN
  will be 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:

  UI76520 UI76521 UI76522 UI76523

Modules/Macros

• DFHISRR
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R000 PSY UI76523

     UP21/08/13 P F108

• R100 PSY UI76522

     UP21/08/03 P F108

• R200 PSY UI76521

     UP21/08/13 P F108

• R300 PSY UI76520

     UP21/08/13 P F108

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.