PH50022: CICS DOES NOT CLEAN UP SOCKET CONTROL BLOCKS WHEN AIO_CANCEL REQUEST COMPLETES WITH AIORV=2 LEADING MAXSOCKETS LIMIT BE REACHED.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• CICS has used BPX1AIO to issue an AIO_CANCEL to cancel an
  outstanding async receive on a socket. When the cancel completes
  with a AIORV=2 CICS does not clean up the socket control blocks
  correctly and the CICS socket object is then left in a state
  where it believes IO is active resulting in the MAXSOCKETS limit
  being reached eventually.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: After many failed attempts to acquire   *
  *                      IPIC connections, CICS issues message   *
  *                      DFHSO0126 An attempt to create a socket *
  *                      has failed because the MAXSOCKETS       *
  *                      limit has been reached.                 *
  ****************************************************************
  Attempts were made to acquire some IPIC connections but these
  failed with capex exceptions. AIO_CANCEL requests to cancel the
  outstanding receives failed with AIO_NOTCANCELED (2). After this
  happened repeatedly, the MAXSOCKETS limit was reached and CICS
  started issuing DFHSO0126 messages.
  

Problem conclusion

• CICS has been updated to ensure we clean up the socket
  correctly if we receive a AIORV=2 (AIO_NOTCANCELED).
  

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:

  PH52115 UI90708 UI90709 UI90710

Modules/Macros

• DFHSOS03
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R100 PSY UI90710

     UP23/02/28 P F302

• R200 PSY UI90709

     UP23/02/25 P F302

• R300 PSY UI90708

     UP23/02/25 P F302

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.