PM45176: CHANNEL AND CONTAINER DATA IS LEFT ORPHANED IN THE GCDSA WHEN A STARTED TRANSACTION FAILS TO START

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• If transaction does an EXEC CICS START of another transaction
  passing to it a CHANNEL and that transaction fails to start (in
  this case because the transaction was disabled). The
  CHANNEL data, which has been stored above the bar, in the GCDSA
  will not be removed. If enough storage above the bar is used
  this will eventually cause the following message to be issued as
  the amount of storage used approaches the MEMLIMIT value
  "DFHSM0606 The amount of MVS above the bar storage available to
   CICS is critically low."
  

Local fix

• Ensure that the started transaction is not disabled
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: EXEC CICS START commands are repeatedly *
  *                      issued against a disabled transaction.  *
  *                      A channel is created each time, but not *
  *                      released. Eventually CICS goes SOS      *
  *                      above the bar.                          *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  An EXEC CICS START command is issued for a transaction which is
  not enabled. A channel is specified on the command, so a copy is
  taken, and passed to the new task. The CSAC transaction is
  attached in place of the disabled transaction, but does not
  release the channel. The storage is orphaned.
  If this is repeated a sufficient number of times, CICS will
  eventually go short on storage above the bar. The following
  message is issued:
  DFHSM0606 The amount of MVS above the bar storage available to
  CICS is critically low.
  
  Additional keywords: msgDFHSM0606 SM0606 PGCSDB
  

Problem conclusion

• The Abnormal Condition Program DFHACP has been modified to test
  to see if there is a channel bound to the running task. If one
  is found it will be deleted.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PM37230

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

  UK71055 UK71056

Modules/Macros

•    DFHACP
  

Fix information

• Fixed component name

  CICS TS Z/OS V4

• Fixed component ID

  5655S9700

Applicable component levels

• R600 PSY UK71055

     UP11/09/07 P F109

• R700 PSY UK71056

     UP11/09/07 P F109

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.