IJ58753: JAVA JIT: CRASH WITH AN 0E0/18 EXECUTING JAVA/UTIL/CONCURRENT/CONURRENTLINKEDQUEUE ON IBM Z

APAR status

• Closed as program error.

Error description

• Error Message: The system or user abend S0E0  R=00000018 was
  issued.
  .
  Stack Trace: 0x05028aa7d1e
  {com/ibm/rmi/util/Utility$RepIdToStubClassCache.get} JIT
  0x400b293e3f4
  {java/util/concurrent/ConcurrentLinkedQueue.contains} INT
  The issue can only occur while executing in JIT compiled code.
  It must be executing
  java/util/concurrent/ConcurrentLinkedQueue.offer/poll code but
  that code could be inlined by the JIT into any java method
  calling java/util/concurrent methods.
  .
  The issue can only occur on IBM Z machines (zOS or zLinux). The
  failing method must be using
  java/util/concurrent/ConcurrentLinkedQueue code. The failing
  instruction will be a "TEND" instruction and a "BPP" instruction
  will be within a few instruction above the "TEND".
  

Local fix

• The problem can be avoided by using the following java command
  line parameter:
  -Xjit:disableBranchPreload
  This option will have a minor effect or performance, but the
  effect can be further minimized by limiting the scope of the
  option to just the one method that caused the crash:
  -Xjit:{*failing_class.method_name*}(disableBranchPreload)
  

Problem summary

• The JIT makes use of constrained transaction memory instructions
  to implement some java/util/concurrent/ConcurrentLinkedQueue
  class operations. The JIT also makes use of Branch Prediction
  Preload (BPP) instructions to reduce CPU stalling when returning
  to caller methods. In rare cases the JIT can insert a BPP
  instruction inside a Constrained Transaction Memory region, but
  running "BPP" instructions is not allowed within a constrained
  transaction memory region causing the CPU to abend with a 0E0/18
  code.
  

Problem conclusion

• The JIT was modified so that BPP instruction are not generated
  inside a constrained transaction memory region.
  https://github.com/eclipse-omr/omr/pull/8263
  .
  This APAR will be fixed in the following Releases:
  .
  IBM Semeru Runtimes
     21              21.0.12.0
     17              17.0.20.0
     11              11.0.32.0
  IBM SDK, Java Technology Edition
     8    SR8 FP70  (8.0.8.70)
  .
  Downloads and supplementary documentation can be found at the
  following locations:
  - For non z/OS operating systems:
    - IBM Semeru Runtimes, Version 11 and later
      https://www.ibm.com/semeru-runtimes/downloads/
    - IBM SDK, Java Technology Edition, Version 8
      https://www.ibm.com/support/pages/java-sdk-downloads/
  - For the z/OS operating system:
    - Java SDK Products on z/OS
      https://www.ibm.com/support/pages/java-sdk-products-zos
  

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

  JIT

• Fixed component ID

  620700124

Applicable component levels