Java crashes in HeapDumper

Environment

• Oracle/Sun JDK
  • 1.6
  • 1.8.0_60, 1.8.0_144
  • 1.8.0_181-b13

Issue

• On Oracle/Sun JDK 1.6 :
  Our JVM crashed in libjvm's HeapDumper when creating a heap dump:
  [1]

Stack: [0x00007fb3bc1c7000,0x00007fb3bc2c8000],  sp=0x00007fb3bc2c6960,  free space=1022k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [libjvm.so+0x496e2a]  HeapObjectDumper::do_object(oopDesc*)+0x4a
V  [libjvm.so+0x6e332f]  MutableSpace::object_iterate(ObjectClosure*)+0x2f
V  [libjvm.so+0x768101]  PSYoungGen::object_iterate(ObjectClosure*)+0x21
V  [libjvm.so+0x726cce]  ParallelScavengeHeap::object_iterate(ObjectClosure*)+0x1e
V  [libjvm.so+0x72768d]  ParallelScavengeHeap::safe_object_iterate(ObjectClosure*)+0xd
V  [libjvm.so+0x497c11]  VM_HeapDumper::doit()+0x1d1
V  [libjvm.so+0x870a2a]  VM_Operation::evaluate()+0x4a
V  [libjvm.so+0x86fff2]  VMThread::evaluate_operation(VM_Operation*)+0x82
V  [libjvm.so+0x870268]  VMThread::loop()+0x198
V  [libjvm.so+0x86fd6e]  VMThread::run()+0x6e
V  [libjvm.so+0x712eef]  java_start(Thread*)+0x13f

• On Oracle/Sun JDK 1.8.0_144-b01 stacktrace as
  [2]

Stack: [0x00007f02973f4000,0x00007f02974f5000],  sp=0x00007f02974f3880,  free space=1022k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [libjvm.so+0x6960db]  java_lang_Class::signers(oopDesc*)+0x1b
V  [libjvm.so+0x622c4a]  DumperSupport::dump_class_and_array_classes(DumpWriter*, Klass*)+0xba
V  [libjvm.so+0x46b856]  ClassLoaderDataGraph::classes_do(void (*)(Klass*))+0x36
V  [libjvm.so+0x624f29]  VM_HeapDumper::doit()+0x239
V  [libjvm.so+0xad4685]  VM_Operation::evaluate()+0x55
V  [libjvm.so+0xad2a5a]  VMThread::evaluate_operation(VM_Operation*)+0xba
V  [libjvm.so+0xad2dde]  VMThread::loop()+0x1ce
V  [libjvm.so+0xad3250]  VMThread::run()+0x70
V  [libjvm.so+0x92a338]  java_start(Thread*)+0x108
VM_Operation (0x00007f0162a74460): HeapDumper, mode: safepoint, requested by thread 0x00007f01fcd5a000

• OpenJDK17 manual heap dump causes EAP to crash

Resolution

Disclaimer: Note that the link provided above points to a web site not owned or controlled by Red Hat. Use information present here at your own discretion.

Engage Oracle for further information on a fix. It doesn't appear to be fixed on 1.6 so an upgrade to the latest OracleJDK 1.7 update may be required.

Another alternative is to reproduce on the OpenJDK if possible and engage Red Hat.

Root Cause

• First stack trace above mentioned in Issue paragraph[1] is Oracle JDK6 bug

  • Content from bugs.java.com is not included.JDK-7110428 : Crash during HeapDump operation
  • Fixed version : 6u85, 7u2, 8

• Second stack trace in Issue paragraph[2] is Oracle JDK8 unresolved issue :

  • Content from bugs.openjdk.java.net is not included.JDK-8080741 JVM crashes sporadically with SIGSEGV
  • This issue has not been fixed because it is lack of information to analyze root cause.
  • Provide hs_err* and core file for further troubleshooting.

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