IV76132: JVM FAILS TO RENAME CORE DUMP FROM CHILD PROCESS IF %T IS SPECIFIED IN CORE_PATTERN

APAR status

• Closed as program error.

Error description

• Error Message: JVMDUMP012E Error in System dump: Unable to
  derive system core filename from pattern in
  /proc/sys/kernel/core_pattern: "core.%p.%t". "%t" specifier is
  not supported. Look for core file generated by child process
  with pid = 4552
  .
  Stack Trace: N/A
  .
  The JVM produces system dumps on Linux by using the fork() API
  to start an identical process to the parent JVM process. The JVM
  then generates a signal in the child process which triggers the
  Linux OS to create a system dump for the child process. The
  parent JVM processes and renames the system dump, as required,
  by the -Xdump options. If the %t specifier is used in the
  proc/sys/kernel/core_pattern setting, the system dump is written
  successfully, but the dump is not renamed by the JVM. The dump
  filename is the OS name (typically core.<pid>) instead of the
  filename specified in the JVM -Xdump settings.
  

Local fix

• Workarounds for the issue are either to modify
  /proc/sys/kernel/core_pattern to remove the %t specifier, or to
  locate the core dump using its OS filename instead of the
  filename specified in the JVM -Xdump settings.
  

Problem summary

• The problem is caused when the JVM is unable to locate the core
  dump produced by the child process.
  

Problem conclusion

• The JVM has been updated to locate and rename the core dump.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR2       (8.0.2.0)
     7 R1 SR3 FP20  (7.1.3.20)
  .
  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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