IV18689: CRASH IN CREATETHREADINFOARRAY()

APAR status

• Closed as program error.

Error description

• Error Message: Occasionally in a low-memory environment a
  SIGSEGV/GPF is recieved when user attempts to profile threads
  using the ThreadMXBean management class.
  .
  Stack Trace: (gdb) where
  #0  0x00007f0bf75eb052 in j9dump_create () from
  ./opt/app/ibm/WebSphere/AppServer/java/jre/lib/amd64/compressedr
  efs/libj9prt26.so
  #1  0x00007f0bf7078467 in doSystemDump () from
  ./opt/app/ibm/WebSphere/AppServer/java/jre/lib/amd64/compressedr
  efs/libj9dmp26.so
  #2  0x00007f0bf75f834f in j9sig_protect () from
  ./opt/app/ibm/WebSphere/AppServer/java/jre/lib/amd64/compressedr
  efs/libj9prt26.so
  #3  0x00007f0bf7076fa8 in runDumpFunction () from
  ./opt/app/ibm/WebSphere/AppServer/java/jre/lib/amd64/compressedr
  efs/libj9dmp26.so
  #4  0x00007f0bf707adab in runDumpAgent () from
  ./opt/app/ibm/WebSphere/AppServer/java/jre/lib/amd64/compressedr
  efs/libj9dmp26.so
  #5  0x00007f0bf708adcf in triggerDumpAgents () from
  ./opt/app/ibm/WebSphere/AppServer/java/jre/lib/amd64/compressedr
  efs/libj9dmp26.so
  #6  0x00007f0bf794af59 in generateDiagnosticFiles () from
  ./opt/app/ibm/WebSphere/AppServer/java/jre/lib/amd64/compressedr
  efs/libj9vm26.so
  #7  0x00007f0bf75f834f in j9sig_protect () from
  ./opt/app/ibm/WebSphere/AppServer/java/jre/lib/amd64/compressedr
  efs/libj9prt26.so
  #8  0x00007f0bf794b176 in vmSignalHandler () from
  ./opt/app/ibm/WebSphere/AppServer/java/jre/lib/amd64/compressedr
  efs/libj9vm26.so
  #9  0x00007f0bf794b9d1 in structuredSignalHandler () from
  ./opt/app/ibm/WebSphere/AppServer/java/jre/lib/amd64/compressedr
  efs/libj9vm26.so
  #10 0x00007f0bf75f776f in masterSynchSignalHandler () from
  ./opt/app/ibm/WebSphere/AppServer/java/jre/lib/amd64/compressedr
  efs/libj9prt26.so
  #11 <signal handler called>
  #12 0x00007f0bf5b462b9 in createThreadInfoArray () from
  ./opt/app/ibm/WebSphere/AppServer/java/jre/lib/amd64/compressedr
  efs/libjclscar_26.so
  #13 0x00007f0bf5b476a8 in
  Java_com_ibm_lang_management_ThreadMXBeanImpl_getMultiThreadInfo
  Impl () from
  ./opt/app/ibm/WebSphere/AppServer/java/jre/lib/amd64/compressedr
  efs/libjclscar_26.so
  #14 0x00007f0bf796204f in VMprJavaSendNative () from
  ./opt/app/ibm/WebSphere/AppServer/java/jre/lib/amd64/compressedr
  efs/libj9vm26.so
  .
  

Local fix

Problem summary

• The problem is caused when we fail to perform suitable checks
  after the createThreadInfoArray call in the JVM
  

Problem conclusion

• This defect will be fixed in:
  6.0.1 SR3
  6.0.0 SR11
  7.0.0 SR2
  .
  The JVM has been updated to perform suitable error checks after
  the createThreadInfoArray and display an error message when we
  find one.
  

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

• R260 PSY

     UP

• R600 PSY

     UP