IJ56711: JVM MAY STOP ON VIRTUAL SERVER WITHOUT AVX SUPPORT

APAR status

• Closed as program error.

Error description

• Error Message: JVM stops unexpectedly with an assertion failed
  message:
  Old API and new API did not match: processor feature 104
  This problem is specific to the x86 platform.
  .
  Stack Trace: raise+0x10f (0x00007F3ED1E55B8F
  <OSB>libpthread.so.0+0x12b8f<CSB>)
  _ZN2TR4trapEv+0x47 (0x00007F3ECB945407
  <OSB>libj9jit29.so+0x4db407<CSB>)
   (0x00007F3ECB945492 <OSB>libj9jit29.so+0x4db492<CSB>)
   (0x00007F3ECB718031 <OSB>libj9jit29.so+0x2ae031<CSB>)
  _ZN3OMR3X865AMD6413CodeGenerator10initializeEv+0x35e
  (0x00007F3ECBD39AAE <OSB>libj9jit29.so+0x8cfaae<CSB>)
  .
  

Local fix

• The problem can be avoided by setting the following environment
  (shell) variable:
  export TR_DisableCPUDetectionTest=1
  

Problem summary

• The problem arises because code in the JVM assumes that the bmi2
  
  feature depends on avx support. On physical processors, those
  having bmi2 also support avx, so the assumption went
  undiscovered for some time. However on a virtualized server it
  is possible for bmi2 to be enabled when avx is not. This may
  even be common with some virtualization software running on
  Windows when Hyper-V is enabled.
  

Problem conclusion

• In reality, bmi2 is independent of avx and the JVM was being
  overly conservative in requiring both. The test has been relaxed
  
  to no longer require avx when testing for the bmi2 feature.
  https://github.com/eclipse-openj9/openj9-omr/pull/259
  .
  This APAR will be fixed in the following Releases:
  .
  IBM Semeru Runtimes
    25   SR1 FP0    25.0.1.0
    21              21.0.9.0
    17              17.0.17.0
    11              11.0.29.0
  IBM SDK, Java Technology Edition
    8    SR8 FP60  (8.0.8.60)
  .
  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