PH67498: FIX DEADLOCK ISSUE WITH -DJAVA.SECURITY.AUTH.DEBUG=ALL IN JAVA 8 Z/OS

APAR status

• Closed as program error.

Error description

• Error Message: Users of Java 8 on z/OS may encounter a deadlock
  issue in a multithreaded environment when specifying
  -Djava.security.auth.debug=all.
  .
  Stack Trace: 1LKDEADLOCK Deadlock detected !!!
  NULL ---------------------
  NULL
  2LKDEADLOCKTHR Thread "Config-Thread-13" (0x000000003C281A00)
  3LKDEADLOCKWTR is waiting for:
  4LKDEADLOCKMON sys_mon_t:0x00000050C8B3DE08 infl_mon_t:
  0x00000050C8B3DE80:
  4LKDEADLOCKOBJ
  java/util/logging/ConsoleHandler@0x00000000805E6FC8
  3LKDEADLOCKOWN which is owned by:
  2LKDEADLOCKTHR Thread "Default Executor-thread-3"
  (0x000000003C71FF00)
  3LKDEADLOCKWTR which is waiting for:
  4LKDEADLOCKMON sys_mon_t:0x00000051712852C0 infl_mon_t:
  0x0000005171285338:
  4LKDEADLOCKOBJ
  java/util/logging/ConsoleHandler@0x000000008038FE88
  3LKDEADLOCKOWN which is owned by:
  2LKDEADLOCKTHR Thread "Config-Thread-13" (0x000000003C281A00)
  .
  Threads involved that are using loggers are from the IBMJCECCA
  provider and the IBMJCEHYBRID provider.
  3XMTHREADINFO "Config-Thread-13"
  J9VMThread:0x000000003C281A00, omrthread_t:0x000000507E44A958,
  java/lang/Thread:0x00000000808445E0, state:B, prio=5
  3XMJAVALTHREAD (java/lang/Thread getId:0x2E,
  isDaemon:true)
  3XMJAVALTHRCCL
  org/eclipse/osgi/internal/framework/ContextFinder(0x000000008012
  C5B8)
  3XMTHREADINFO1 (native thread ID:0x47BF00000000002A,
  native priority:0x5, native policy:UNKNOWN, vmstate:B, vm thread
  flags:0x00000201)
  3XMCPUTIME CPU usage total: 1.424000000 secs,
  current category="Application"
  3XMTHREADBLOCK Blocked on:
  java/util/logging/ConsoleHandler@0x00000000805E6FC8 Owned by:
  "Default Executor-thread-3" (J9VMThread:0x000000003C71FF00,
  java/lang/Thread:0x00000000824F1590)
  3XMHEAPALLOC Heap bytes allocated since last GC
  cycle=68936 (0x10D48)
  3XMTHREADINFO3 Java callstack:
  4XESTACKTRACE at
  java/util/logging/StreamHandler.publish(StreamHandler.java:217(C
  ompiled Code))
  5XESTACKTRACE (entered lock:
  java/util/logging/ConsoleHandler@0x00000000805E6FC8, entry
  count: 1)
  4XESTACKTRACE at
  java/util/logging/ConsoleHandler.publish(ConsoleHandler.java:127
  (Compiled Code))
  4XESTACKTRACE at
  java/util/logging/Logger.log(Logger.java:749(Compiled Code))
  ----------------
  3XMTHREADINFO "Default Executor-thread-3"
  J9VMThread:0x000000003C71FF00, omrthread_t:0x00000051A3951798,
  java/lang/Thread:0x00000000824F1590, state:B, prio=5
  3XMJAVALTHREAD (java/lang/Thread getId:0x41,
  isDaemon:true)
  3XMJAVALTHRCCL
  org/eclipse/osgi/internal/framework/ContextFinder(0x000000008012
  C5B8)
  3XMTHREADINFO1 (native thread ID:0x4AC208000000003C,
  native priority:0x5, native policy:UNKNOWN, vmstate:B, vm thread
  flags:0x00000201)
  3XMCPUTIME CPU usage total: 0.772000000 secs,
  current category="Application"
  3XMTHREADBLOCK Blocked on:
  java/util/logging/ConsoleHandler@0x000000008038FE88 Owned by:
  "Config-Thread-13" (J9VMThread:0x000000003C281A00,
  java/lang/Thread:0x00000000808445E0)
  3XMHEAPALLOC Heap bytes allocated since last GC
  cycle=65536 (0x10000)
  3XMTHREADINFO3 Java callstack:
  4XESTACKTRACE at
  java/util/logging/StreamHandler.publish(StreamHandler.java:217(C
  ompiled Code))
  5XESTACKTRACE (entered lock:
  java/util/logging/ConsoleHandler@0x000000008038FE88, entry
  count: 1)
  4XESTACKTRACE at
  java/util/logging/ConsoleHandler.publish(ConsoleHandler.java:127
  (Compiled Code))
  4XESTACKTRACE at
  java/util/logging/Logger.log(Logger.java:749(Compiled Code))
  

Local fix

• Users can specify only the required component to the
  -Djava.security.auth.debug option, such as
  -Djava.security.auth.debug=ibmjcehybrid, to log ibmjcehybrid
  logs.
  

Problem summary

• Users of Java 8 on z/OS may encounter a deadlock issue in a
  multithreaded environment when specifying
  -Djava.security.auth.debug=all.
  The root cause could be the race condition between the
  ibmjcehybrid, ibmjcecca, and ibmpkcs components, which are
  trying to use console handlers to log.
  

Problem conclusion

• The ibmjcecca logger was changed to use a shared console handler
  to avoid a race condition between threads.
  .
  This APAR will be fixed in the following Releases:
  .
  IBM Semeru Runtimes
  IBM SDK, Java Technology Edition
   8 SR8 FP55 (8.0.8.55)
  .
  Downloads and supplementary documentation can be found at the
  following locations:
  - For the z/OS operating system:
   - Java SDK Products on z/OS
   https://www.ibm.com/support/pages/java-sdk-products-zos
  

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

  JAVA Z/OS 64

• Fixed component ID

  620700104

Applicable component levels