IV68689: CRASH WHILE WRITING A JAVACORE DUMP, WHEN RUNNING A LARGE NUMBER OF JAVA THREADS

APAR status

• Closed as program error.

Error description

• Error Message: After a Java dump is triggered, the JVM issues a
  JVMDUMP032I "JVM requested Java dump" message, followed by a
  crash and JVM termination. The Java dump produced is truncated.
  .
  Stack Trace: #0 0x00007ff0017d8aeb in insertNode () from
  ./var/app/was70025/WebSphere/70/java/jre/lib/amd64/compressedref
  s/libj9dmp24.so#1 0x00007ff0017d8b77 in insertNode () from
  ./var/app/was70025/WebSphere/70/java/jre/lib/amd64/compressedref
  s/libj9dmp24.so#2 0x00007ff0017d8b77 in insertNode () from
  ./var/app/was70025/WebSphere/70/java/jre/lib/amd64/compressedref
  s/libj9dmp24.so#3 0x00007ff0017d8b77 in insertNode () from
  ./var/app/was70025/WebSphere/70/java/jre/lib/amd64/compressedref
  s/libj9dmp24.so#4 0x00007ff0017d8b77 in insertNode () from
  ./var/app/was70025/WebSphere/70/java/jre/lib/amd64/compressedref
  s/libj9dmp24.so#5 0x00007ff0017d8b77 in insertNode () from
  ./var/app/was70025/WebSphere/70/java/jre/lib/amd64/compressedref
  s/libj9dmp24.so#6 0x00007ff0017d8b77 in insertNode () from
  ./var/app/was70025/WebSphere/70/java/jre/lib/amd64/compressedref
  s/libj9dmp24.so#7 0x00007ff0017d8b77 in insertNode () from
  ./var/app/was70025/WebSphere/70/java/jre/lib/amd64/compressedref
  s/libj9dmp24.so#8 0x00007ff0017d8318 in avl_insert () from
  ./var/app/was70025/WebSphere/70/java/jre/lib/amd64/compressedref
  s/libj9dmp24.so#9 0x00007ff0017cf37f in
  JavaCoreDumpWriter::writeThreadSection() from
  ./var/app/was70025/WebSphere/70/java/jre/lib/amd64/compressedref
  s/libj9dmp24.so
  .
  The Java application is running a large number of Java threads
  (typically 4,000 to 5,000).
  

Local fix

• Disable Java dumps using the command line option
  -Xdump:java:none.
  

Problem summary

• The problem is caused when the JVM is running a large number of
  Java threads and a Java dump is triggered.
  

Problem conclusion

• The JVM has been updated to prevent the crash from occurring. If
  the JVM is running a large number of Java threads (typically
  4,000 or more), the amount of information collected and written
  to the Java dump for each thread is reduced by omitting the
  native stack.
  .
  This APAR will be fixed in the following Java Releases:
   6 SR16 FP4 (6.0.16.4)
   6 R1 SR8 FP4 (6.1.8.4)
   7 R1 SR3 (7.1.3.0)
   8 SR1 (8.0.1.0)
   7 SR9 (7.0.9.0)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the 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:

• Fixed component name

  J9 COMMON CODE

• Fixed component ID

  620700127

Applicable component levels

• R600 PSY

     UP

• R260 PSY

     UP

• R270 PSY

     UP