IJ46533: A deadlock of AcquireBRTHandlerThread or RangeRevokeWorkerThread waiting for other threads to exit fast path

APAR status

• Closed as program error.

Error description

• There is a code issue that could result in that an AIO
  completion event could be not handled by the AIO completion
  thread, then form a deadlock with long waiter for the thread of
  AcquireBRTHandlerThread or RangeRevokeWorkerThread waiting for
  other threads to exit fast path. In addition, such miss-handling
   for AIO completion could also cause the file system cannot be
  quiesced and memory leak issue.
  

Local fix

Problem summary

• There is a code issue that could result in that an AIO
  completion event could be not handled by the AIO completion
  thread, then form a deadlock with long waiter for the thread of
  AcquireBRTHandlerThread or RangeRevokeWorkerThread waiting for
  other threads to exit fast path. In addition, such miss-handling
   for AIO completion could also cause the file system cannot be
  quiesced and memory leak issue.
  

Problem conclusion

• This problem is fixed in 5.1.2.11
  To see all Spectrum Scale APARs and their respective
  Fix solutions refer to page:
  https://public.dhe.ibm.com/storage/spectrumscale/spectrum_scale_
  apars.html
  
  Benefits of the solution:
  Fix the deadlock issue caused by the AIO completion missing
  handled issue.
  
  Work around:
  No
  
  Problem trigger:
  Doing AIO reads/writes from one node and then start normal
  buffer I/O load from the other nodes against the same files.
  
  Symptom:
  Deadlock
  
  Platforms affected:
  Linux Only
  
  Functional Area affected:
  AIO only
  
  Customer Impact:
  Critical
  

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