IV13168: CRASH OR ASSERTIONS FROM GARBAGE COLLECTOR

APAR status

• Closed as program error.

Error description

• Error Message: Segmentation fault or an assertion from the J9
  Garbage Collector
  .
  Stack Trace: N/A
  .
  

Local fix

• None. The problem is related to supporting the ThreadMXBean API
  and thus the feature cannot be disabled.
  

Problem summary

• The problem is related to how the JIT manages stackmaps to
  support the ThreadMXBean API. When there are recursive locks in
  a method (either created by the programmer or via inlining)
  inside try-catch regions, the JIT incorrectly propagates GC
  stack maps to the catch blocks. If the try-catch region does not
  return from the method, the GC stackmaps for the entire method
  would be wrong. This scenario will result in stack slots not
  updated whenever a GC happens and can possibly result in
  segmentation faults.
  

Problem conclusion

• This defect will be fixed in:
  6.0.0 SR11
  .
  The JIT code has been redesigned to correctly propagate
  stackmaps for supporting the ThreadMXBean API.
  

Temporary fix

• ZE FIX ERROR IV33527 12/12/17
  

Comments

APAR Information

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

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

  PM60284

Fix information

• Fixed component name

  JIT

• Fixed component ID

  620700124

Applicable component levels

• R600 PSY

     UP