IJ27922: ASSERT LBZONEP[ZONE].ZHOLDWORD == 0

APAR status

• Closed as program error.

Error description

• A race condition within GNR fast write logging
  mechanism  could lead to a thread
  incorrectly considering itself as the
  candidate to start zone flushing operations, while
  there are still other threads that have not
  yet completed the fast (short) writing operation
  yet in this zone. The assert
  stopped the flushing operation.
  

Local fix

Problem summary

• A race condition within GNR fast write logging
  mechanism  could lead to a thread
  incorrectly considering itself as the
  candidate to start zone flushing operations, while
  there are still other threads that have not
  yet completed the fast (short) writing operation
  yet in this zone. The assert
  stopped the flushing operation.
  

Problem conclusion

• Benefits of the solution:
  No more assert.
  
  Work Around:
  None
  
  Problem trigger:
  The problem normally happens when multiple
  short write requests are in process at
  the same time. Some threads with bigger
  request size, while others with smaller
  request size.
  
  Symptom:
  Assert will be triggered when this problem occurs:
  lbZoneP[zone].zHoldWord == 0
  
  Platforms affected: N/A
  
  Functional Area affected: GNR/ECE/ESS3K
  
  Customer Impact: Medium Importance
  

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

  SPEC SCALE STD

• Fixed component ID

  5737F33AP

Applicable component levels