PH41310: CSQ0615E CSQ0DLCL AMS POST/WAIT REQUEST FAILED, REASON 000000CA

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• It is possible for lower priority address spaces to be swapped
  out for longer than the CTLLOCK timeout while holding the
  CTLLOCK, resulting in a number of CSQ0615E errors being issued
  together.
  .
  Additional symptoms:
  - AMS workload hangs. The AMS tasks are in CSQ0DPC3 in
    pki_pc_wait waiting to be posted that there is work available.
  - MQ API requests hang in modules including CSQ0QROU, CSQ0KRPT,
    CSQ0KRA.
  - CSQ0614E CSQ0DLCL AMS termination error 00000070, reason
      C1180002
    CSQ0612E CSQ0DLCL System function 'pthread_cond_timedwait()'
      failed
  - MQRC reason 2063 MQRC_SECURITY_ERROR
                2217 MQRC_CONNECTION_NOT_AUTHORIZED
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 2 Modification 0 and                 *
  *                 Release 3 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: MQI requests to AMS protected queues    *
  *                      fail with MQRC_SECURITY_ERROR MQRC2063  *
  *                      or MQRC_CONNECTION_NOT_AUTHORIZED       *
  *                      MQRC2217, or hang indefinitely.         *
  *                                                              *
  *                      The failure can be accompanied by       *
  *                      CSQ0 error messages including:          *
  *                      CSQ0214E, CSQ0215E, CSQ0216E, CSQ0217E  *
  *                      or CSQ0615E.                            *
  ****************************************************************
  An application task that was requesting the CTLLOCK when it is
  undispatched can encounter delays before being dispatched again.
  
  If the task was suspended due to the CTLLOCK being held, and the
  time since the lock was requested has exceeded the maximum wait
  time due to the dispatch delay, the request fails, even if the
  CTLLOCK is no longer held.
  
  If the task had successfully obtained the CTLLOCK prior to being
  interrupted/undispatched, any tasks from other applications or
  the xxxxAMSM address space requiring this lock are unable to
  obtain it until the task has been dispatched and has released
  the lock. If the dispatch delay is sufficiently long, this leads
  to these other tasks/applications failing the request to obtain
  the lock.
  

Problem conclusion

• The processing for tasks requesting or holding the CTLLOCK has
  been improved to reduce the impact of dispatch delays, and a
  final attempt to obtain the CTLLOCK will be made before failing
  the request.
  An error in recovery for tasks making AMS requests has also been
  corrected to avoid the AMS service tasks entering an indefinite
  wait.
  

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:

  UI84000 UI90082

Modules/Macros

• CSQ0DPCS CSQ0KRPT CSQ0KRSD CSQ0KRUP
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R200 PSY UI90082

     UP23/02/04 P F302 ¢

• R300 PSY UI84000

     UP23/02/04 P F302 ¢

Fix is available

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