OpenJDK17 manual heap dump causes EAP to crash

Solution Verified - Updated

Environment

  • JBoss Enterprise Application Platform
    • 7
    • 8
  • OpenJDK17

Issue

  • When attempting to capture a heap dump (/usr/lib/jvm/java-17/bin/jmap -dump:live,format=b,file=heapdump.hprof <APP_PID>), jmap fails with the following error:
Exception in thread "main" java.io.IOException: Premature EOF
        at jdk.attach/sun.tools.attach.HotSpotVirtualMachine.readInt(HotSpotVirtualMachine.java:341)
        at jdk.attach/sun.tools.attach.VirtualMachineImpl.execute(VirtualMachineImpl.java:197)
        at jdk.attach/sun.tools.attach.HotSpotVirtualMachine.executeCommand(HotSpotVirtualMachine.java:310)
        at jdk.jcmd/sun.tools.jmap.JMap.executeCommandForPid(JMap.java:133)
        at jdk.jcmd/sun.tools.jmap.JMap.dump(JMap.java:248)
        at jdk.jcmd/sun.tools.jmap.JMap.main(JMap.java:114)
  • It causes the JBoss process to crash with the following in the fatal error log:
Current thread (0x000055dc0f466840):  VMThread "VM Thread" [stack: 0x00007f951c826000,0x00007f951c926000] [id=2369242]

Stack: [0x00007f951c826000,0x00007f951c926000],  sp=0x00007f951c924698,  free space=1017k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [libjvm.so+0x294324]  AccessInternal::PostRuntimeDispatch<G1BarrierSet::AccessBarrier<548964ul, G1BarrierSet>, (AccessInternal::BarrierType)2, 548964ul>::oop_access_barrier(void*)+0x4
V  [libjvm.so+0x7fb223]  HeapRegion::object_iterate(ObjectClosure*)+0xc3
V  [libjvm.so+0x71a06b]  IterateObjectClosureRegionClosure::do_heap_region(HeapRegion*)+0x2b
V  [libjvm.so+0x800fc0]  HeapRegionManager::iterate(HeapRegionClosure*) const+0x40
V  [libjvm.so+0x70d40e]  G1CollectedHeap::object_iterate(ObjectClosure*)+0x3e
V  [libjvm.so+0x7ed96e]  VM_HeapDumper::work(unsigned int) [clone .part.156]+0x20e
V  [libjvm.so+0xf7e3df]  WorkGang::run_task(AbstractGangTask*, unsigned int, bool)+0xef
V  [libjvm.so+0x7edf04]  VM_HeapDumper::doit()+0x84
V  [libjvm.so+0xf51f9f]  VM_Operation::evaluate()+0xef
V  [libjvm.so+0xf540c8]  VMThread::inner_execute(VM_Operation*)+0x258
V  [libjvm.so+0xf5453e]  VMThread::loop()+0x12e
V  [libjvm.so+0xf547dc]  VMThread::run()+0x8c
V  [libjvm.so+0xecf963]  Thread::call_run()+0x73
V  [libjvm.so+0xc3e18b]  thread_native_entry(Thread*)+0xeb

Resolution

Remove -XX:-ClassUnloading to allow the default behavior of unloading unreachable classes to collect metaspace during garbage collection.

Root Cause

Class unloading is disabled with -XX:-ClassUnloading.

Diagnostic Steps

Check if the -XX:-ClassUnloadingJVM option is being used.

SBR
Product(s)

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