IJ58271: CRASH WHEN CONCURRENT SCAVENGER IN ABORT STATE

APAR status

• Closed as program error.

Error description

• Error Message: A SIGSEGV event is received
  .
  Stack Trace: {com/ibm/json/java/internal/Serializer.writeObject}
  JIT <OSB>0000000044a88770<CSB>
  {com/ibm/json/java/internal/Serializer.write} JIT
  <OSB>0000000044a88950<CSB>
  {com/ibm/json/java/internal/Serializer.writeObject} JIT
  <OSB>0000000044a889c0<CSB>
  {com/ibm/json/java/internal/Serializer.writeObject} JIT
  <OSB>0000000044a88ba0<CSB>
  {com/ibm/json/java/internal/Serializer.writeObject} JIT
  <OSB>0000000044a88d80<CSB>
  {com/ibm/json/java/internal/Serializer.writeObject} JIT
  <OSB>0000000044a88f60<CSB>
  {com/ibm/json/java/internal/Serializer.writeObject} JIT
  <OSB>0000000044a89140<CSB>
  {com/ibm/zosconnect/internal/ResponseDataHandler.setOutputJson}
  JIT <OSB>0000000044a89320<CSB>
  {com/ibm/zosconnect/internal/ApiManagerImpl.invokeApi} JIT
  <OSB>0000000044a89438<CSB>
  {com/ibm/zosconnect/internal/web/ServiceProxyServlet$3.run} JIT
  <OSB>0000000044a895f0<CSB>
  {com/ibm/ws/webcontainer/async/ServiceWrapper.wrapAndRun} JIT
  <OSB>0000000044a896d0<CSB>
  {com/ibm/ws/webcontainer/async/WrapperRunnableImpl.run} JIT
  <OSB>0000000044a89750<CSB>
  {com/ibm/ws/threading/internal/ExecutorServiceImpl$RunnableWrapp
  er.run} JIT <OSB>0000000044a898b8<CSB>
  {java/util/concurrent/ThreadPoolExecutor.runWorker} JIT
  <OSB>0000000044a89920<CSB>
  {java/lang/Thread.run} JIT <OSB>0000000044a89a00<CSB>
  {libj9jit29.so}{ZreturnFromJIT0} <OSB>0x97fd<CSB>
  .
  

Local fix

• The issue can be worked around by removing JVM option
  -Xgc:concurrentScavenge
  

Problem summary

• The problem is caused when concurrent scavenge is in abort state
  and the read barrier is wrongly disabled.
  

Problem conclusion

• The JVM has been changed so that the read barrier is enabled
  when the concurrent scavenge is in abort state.
  https://github.com/eclipse-openj9/openj9/pull/23810
  .
  This APAR will be fixed in the following Releases:
  .
  IBM Semeru Runtimes
     21              21.0.12.0
     21              21.0.12.0
     17              17.0.20.0
     11              11.0.32.0
  IBM SDK, Java Technology Edition
     8    SR -      (8.0.-.0)
  .
  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