IJ21098: IBM J9 UNBLOCKS SIGNALS BY DEFAULT

APAR status

• Closed as program error.

Error description

• Error Message: The shutdown sequence dependent on SIGUSR2 does
  not execute.
  .
  Stack Trace: N/A
  .
  https://github.com/eclipse/openj9/issues/7749
  

Local fix

Problem summary

• Currently, IBM J9 unblocks all supported signals during startup.
  A signal is unblocked even when a signal handler is not
  installed for it. This causes a conflict when a native
  application blocks a set of signals before invoking
  JNI_CreateJavaVM. In IBM J9, JNI_CreateJavaVM unblocks those
  signals at startup. This hinders the native application's signal
  handling behavior.
  

Problem conclusion

• IBM J9 has been updated to unblock a signal only if a signal is
  used by the JVM i.e. a signal handler is registered for it.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR6 FP5   (8.0.6.5)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the available
  Service Refreshes and Fix Packs can be found at:
             https://www.ibm.com/developerworks/java/jdk/
  

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

  J9 COMMON CODE

• Fixed component ID

  620700127

Applicable component levels

• R270 PSY

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