PI44176: CICS TG returns "MODIFY REJECTED-TASK BUSY" to all SDSF commands and might run out of IPIC sessions.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• CICS TG returns "IEE342I MODIFY REJECTED-TASK BUSY modify
  rejected task busy" to all SDSF commands after a /F
  <jobname>,APPL=STATS,GS command has been issued. The Gateway
  daemon has to be cancelled to clear the problem. Additional
  search words: MSGIEE342I IEE342 MSGIEE342 IEE342I
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of CICS Transaction Gateway with   *
  *                 IPIC connected CICS servers.                 *
  ****************************************************************
  * PROBLEM DESCRIPTION: CICS TG returns "IEE342I MODIFY         *
  *                      REJECTED-TASK BUSY modify rejected task *
  *                      busy" to all SDSF commands after a /F   *
  *                      <jobname>,APPL=STATS,GS command has     *
  *                      been issued.  The Gateway daemon has to *
  *                      be cancelled to clear the problem.      *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The failure to return results for a statistics request was
  caused by 2 threads in the CICS TG IPIC code deadlocking each
  other. When the modify command was issued to request the CICS
  TG statistics, the ZOSConsole thread waited on the request to
  collect the statistics which could not complete due to the IPIC
  deadlock. Another symptom of this problem is that IPIC
  sessions might become unresponsive, leading to a reduction in
  the number of available IPIC sessions. A javacore dump taken at
  the time of the problem shows "Deadlock detected !!!" with a
  CICS TG IPIC receiver thread waiting on a resource lock which is
  owned by a CICS TG TcpConnection thread, and the CICS TG
  TcpConnection thread waiting on a resource lock that is owned by
  the CICS TG IPIC Receiver thread.
  

Problem conclusion

• CICS TG has been corrected to prevent the deadlock in the CICS
  TG IPIC code, which caused the reported problem.
  

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:

  PI54452 UI34250 UI34251

Modules/Macros

• CTG00201 CTG00204 CTG00974
  

Fix information

• Fixed component name

  CTG V9 FOR Z/OS

• Fixed component ID

  5655Y2000

Applicable component levels

• R900 PSY UI34250

     UP16/01/21 P F601

• R910 PSY UI34251

     UP16/01/21 P F601

Fix is available

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