PI68597: Signal 11 in the Client daemon received after a SNA communications failure

CICS Transaction Gateway for Multiplatforms V9.2 Fix Pack 1
CICS Transaction Gateway for Multiplatforms V9.1 Fix Pack 3
CICS Transaction Gateway for Desktop Edition V9.1 Fix Pack 3
CICS Transaction Gateway Desktop Edition V8.1 Fix Pack 5
CICS Transaction Gateway for Multiplatforms V8.1 Fix Pack 5
CICS Transaction Gateway Desktop Edition V9.2 (all supported platforms)
CICS Transaction Gateway for Multiplatforms V9.2 (all supported platforms)
CICS Transaction Gateway for Multiplatforms V9.0 Fix Pack 5
CICS Transaction Gateway Desktop Edition V9.0 Fix Pack 5

APAR status

• Closed as program error.

Error description

• After a SNA network failure the following problems were
  reported: Signal 11 received in CICS TG Client daemon code
  "CcDrvClose" after SNA network failure. Signal 11 received in
  IBM Communications Manager code "vav_copy_vcb" in CICS TG
  Client daemon process, after SNA network failure.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All users of CICS TG and SNA connected CICS servers.
  ****************************************************************
  PROBLEM SUMMARY:
  After a SNA communications failure, the CICS TG Client daemon
  code can free some control blocks that are still required for
  processing while they are still required, leading to a signal
  11. If there is a reference to the freed control block in CICS
  TG code a signal 11 in CcDrvClose is reported, if the reference
  is made by IBM Communications Manager code a signal 11 in
  vav_copy_vcb is reported.
  The problem can occur either when a SNA connection that is
  already established is lost, or when a connection is being
  established and a CCIN timeout occurs.
  ****************************************************************
  

Problem conclusion

• CICS TG has been changed to retain the required control blocks
  until the failed sessions have been cleaned up.
  

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

  CICS TRNS GATE

• Fixed component ID

  5724I8102

Applicable component levels

• R810 PSY

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