PM10711: JAVA JIT COMPILATION THREAD NOT RELEASING VM CLASS TABLE LOCK CAUSING APPLICATION TO HANG.

APAR status

• Closed as duplicate of another APAR.

Error description

• Error Message: The application hangs in a random or intermittent
  manner while under heavy load with frequent GC cycles.
  .
  Stack Trace: N/A
  .
  The javacore shows:
  
  1) That the VM class table lock is owned by the JIT Compilation
  Thread and a number of other threads are waiting to obtain the
  lock.
  
  2LKREGMON          VM class table lock (0x...): Flat locked by
   "JIT Compilation Thread" (0x...), entry count 1
  3LKWAITERQ            Waiting to enter:
  3LKWAITER                "ThreadName" (0x...)
  
  2) The JIT-CompilationQueueMonitor lock is unowned.
  
  2LKREGMON          JIT-CompilationQueueMonitor lock (0x...):
   <unowned>
  3LKNOTIFYQ            Waiting to be notified:
  3LKWAITNOTIFY            "JIT Compilation Thread" (0x...)
  
  KEYWORDS
  Deadlock hang
  

Local fix

• This problem can be avoided by using the -Xjit:disableCHOpts
  option. Note however that this option may incur a slight
  performance impact.
  

Problem summary

Problem conclusion

Temporary fix

Comments

• PM10711 is a sysroute of APAR IZ67874. It was taken to deliver
  a ++APAR. PM10711 is being closed DUP of PM18025 because
  PM18025 will document the delivery of SDK 1.5 SR12 which
  will contain the fix for IZ67874.
  

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IZ67874

• APAR is sysrouted TO one or more of the following:

Fix information

Applicable component levels