IV77014: SUBDIRECTORY 'CORE' RENAMED WHEN SYSTEM DUMP PRODUCED BY JVM

APAR status

• Closed as program error.

Error description

• Error Message: If there is an existing subdirectory named 'core'
  in the current working directory of the JVM, the JVM may rename
  that directory when a system dump is produced. The problem only
  occurs on Linux, and only occurs if the default OS system dump
  name is 'core' (ie. /proc/sys/kernel/core_uses_pid is set to 0).
  .
  Stack Trace: N/A
  .
  The problem may also occur with other non-regular files, for
  example symbolic links.
  

Local fix

• Set /proc/sys/kernel/core_uses_pid to 1. The system dump
  produced by the Linux OS will then have the process ID (PID)
  appended to the core filename, avoiding the clash with the
  existing directory name.
  

Problem summary

• The problem is caused when the file name of the expected OS
  system dump clashes with an existing directory name.
  

Problem conclusion

• The JVM has been updated to prevent the directory from being
  renamed. The following new error message is produced:
  JVMPORT048E Failed to create system dump because a non-regular
  file "/<current directory>/core" exists with the same name as
  the expected system dump file.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR2       (8.0.2.0)
  .
  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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