IV12627: JVM CRASH WHEN USING SUN/MISC/UNSAFE.GET* METHODS

APAR status

• Closed as program error.

Error description

• Error Message: Unhandled exception
  Type=Segmentation error vmState=0x00000000
  ...
  Module=/team/sdk/jre/lib/amd64/default/libjclscar_24.so
  ...
  ----------- Stack Backtrace -----------
  sun_misc_Unsafe_getLong__Ljava_lang_Object_2J+0x3d
  ---------------------------------------
  JVMDUMP006I Processing dump event "gpf", detail "" - please
  wait.
  ...
  .
  Stack Trace: Native stack showing crash in
  "sun_misc_Unsafe_getLong__Ljava_lang_Object_2J":
  ...
  #10 0x00002aaaab078921 in masterSynchSignalHandler () from
  /team/sdk/jre/lib/amd64/default/libj9prt24.so
  #11 <signal handler called>
  #12 0x00002aaaad8fa5a9 in
  sun_misc_Unsafe_getLong__Ljava_lang_Object_2J () from
  /team/sdk/jre/lib/amd64/default/libjclscar_24.so
  .
  N/A
  

Local fix

• N/A
  

Problem summary

• getlong method handled mis-aligned offsets incorrectly which
  lead to crash.
  

Problem conclusion

• This defect will be fixed in:
  6.0.0 SR11
  .
  The JVM has been updated to handle the mis-aligned offsets
  correctly and hence preventing the crash from occurring.
  

Temporary fix

• N/A
  

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

  J9 COMMON CODE

• Fixed component ID

  620700127

Applicable component levels

• R600 PSY

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