PH68535: LRB7 CHAIN LOOP FOLLOWING ABEND IN CSQJW107

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Recovery code following abend in CSQJW107 causes LRB7 chain
  loop.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM for z/OS Version 9          *
  *                 Release 3 Modification 0 and                 *
  *                 Release 4 Modification 0                     *
  ****************************************************************
  * PROBLEM DESCRIPTION: Following an abend in CSQJW107,         *
  *                      recovery code causes a LRB7 chain loop, *
  *                      resulting in a CPU Spinloop.            *
  ****************************************************************
  The code that requeues the LRB7 blocks does not clear blocks
  from its chain. This means that any blocks on the LRB7 chain are
  now on two chains. This results in a loop in the chain, and
  CSQJW107 spinning while looping through the blocks.
  

Problem conclusion

• The recovery code has been updated to clear its own LRB7 chain
  after requeuing the blocks
  

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:

  UO05801 UO05802

Modules/Macros

• CSQJW008
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R300 PSY UO05801

     UP26/01/10 P F601

• R400 PSY UO05802

     UP26/01/10 P F601

Fix is available

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