PI17955: CSQ1,ABN=0C4-00000011,U=SYSOPR,C=R3600.710.CFM -CSQERCF2,M=CSQGFRCV,LOC=CSQELPLM.CSQERCF2+00000FF

APAR status

• Closed as duplicate of another APAR.

Error description

• The CF connloss event occurs, and CSQ1 loses connectivity to
  both FLASH3 and FLASH6. In order to optimise the recovery
  processing, both structures are recovered in the same task, in
  this case the backup recovery task associated with CF structure
  FLASH3. During the recovery processing, the backups for each
  structure are read in parallel on the relevant backup recovery
  tasks. Synchronisation for completion of this is required. A
  ROB associated with the backup recovery task is used. The ROB
  however was used in a previous recovery and has been left in a
  state where it is already posted. Thus when the recovery for
  structure FLASH3 is done, and it suspends on the ROB, it
  incorrectly finds that processing for structure FLASH6 is
  complete and starts freeing storage. As recovery for structure
  FLASH6 is still in progress, an 0C4 occurred when the freed
  storage was next referenced.
  

Local fix

Problem summary

• PI17955 closed DUP of PI19446
  

Problem conclusion

Temporary fix

Comments

• The queue manager abends with 0C4 in CSQERCF2 during CF
  structure recovery.
  
  When multiple structures are recovered, CSQERRPB allocates a
  RPLH used by all recovery processes, reads the log, and then
  schedules CSQERCF2 to run on each backup recovery task for the
  structures being recovered.
  It then goes ahead and calls csqercf2 for the structure on the
  tasks it is running. Once it returns, it suspends on the
  BRCB_pROB for each task to wait for CSQERCF2 to complete on each
  of the other tasks.
  For one of the structures it finds that the rob has already been
  resumed and carries on, causing it to free storage, including
  the RPLH.
  CSQERCF2 however is still running for that structure, as the rob
  was left in the resume state from a previous recovery process.
  The 0C4 occurs the next time CSQERCF2 references any storage in
  the RPLH.
  
  This APAR has been closed DUP of PI19446.
  COMMENTS.21
  

APAR Information

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

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

  UI19082

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels