I've observed this assertion several times (on the sparc only), when humongous objects are allocated. Here are couple of them: http://sqeweb.sfbay.sun.com/nfs/tools/gtee/results/JDK6/ADHOC/VM/2010-02-03_03/vm/solaris-sparc/server/mixed/solaris-sparc_server_mixed_vm.gc.testlist/ResultDir/LargeHeap02 or http://sqeweb.sfbay.sun.com/nfs/tools/gtee/results/JDK6/ADHOC/VM/2010-02-02_02/vm/solaris-sparc/client/mixed/solaris-sparc_client_mixed_vm.gc.testlist/ResultDir/MemoryEater This crash should be often reproduced. However test works a long time before crashes. The stack trace from hs_err: ;; Using jvm: "/net/sqenfs-1.sfbay/export1/jdk/vm/hsx/17/pit/b08/jdk7b81/fastdebug/solaris-sparc/jre/lib/sparc/server/libjvm.so" # # A fatal error has been detected by the Java Runtime Environment: # # Internal Error (/tmp/jprt/P1/B/230259.et151817/source/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp:647), pid=4352, tid=19 # Error: assert(res != 0,"This should have worked.") # # JRE version: 7.0-b80 # Java VM: Java HotSpot(TM) Server VM (17.0-b08-2010-01-22-230259.et151817.hs17b08-fastdebug mixed mode solaris-sparc ) # If you would like to submit a bug report, please visit: # http://java.sun.com/webapps/bugreport/crash.jsp # --------------- T H R E A D --------------- Current thread (0x01267000): JavaThread "Thread-1" [_thread_in_vm, id=19, stack(0x70180000,0x70200000)] Stack: [0x70180000,0x70200000], sp=0x701ff410, free space=1fdfefad06ck Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code) V [libjvm.so+0x134c524];; void VMError::report_and_die()+0x718 V [libjvm.so+0x6f1d10];; void report_assertion_failure(const char*,int,const char*)+0x70 V [libjvm.so+0x7c731c];; HeapWord*G1CollectedHeap::humongousObjAllocate(unsigned)+0x120 V [libjvm.so+0x7c7b04];; HeapWord*G1CollectedHeap::mem_allocate(unsigned,bool,bool,bool*)+0x248 V [libjvm.so+0x2b8778];; HeapWord*CollectedHeap::common_mem_allocate_noinit(unsigned,bool,Thread*)+0xd8 V [libjvm.so+0x127a4c0];; typeArrayOop typeArrayKlass::allocate(int,Thread*)+0x804 V [libjvm.so+0xfb3600];; typeArrayOop oopFactory::new_typeArray(BasicType,int,Thread*)+0x128 V [libjvm.so+0x90ebb0];; void InterpreterRuntime::newarray(JavaThread*,BasicType,int)+0x1bc j gc.huge.quicklook.memory.LargeHeap02.helper.create(I)V+1 j gc.huge.quicklook.memory.LargeHeap02.helper.run()V+4 v ~StubRoutines::call_stub V [libjvm.so+0x94594c];; void JavaCalls::call_helper(JavaValue*,methodHandle*,JavaCallArguments*,Thread*)+0x908 V [libjvm.so+0x943e4c];; void JavaCalls::call_virtual(JavaValue*,KlassHandle,symbolHandle,symbolHandle,JavaCallArguments*,Thread*)+0x404 V [libjvm.so+0x943f5c];; void JavaCalls::call_virtual(JavaValue*,Handle,KlassHandle,symbolHandle,symbolHandle,Thread*)+0xf4 V [libjvm.so+0xaacaa0];; void thread_entry(JavaThread*,Thread*)+0x318 V [libjvm.so+0x1241cdc];; void JavaThread::thread_main_inner()+0x228 V [libjvm.so+0x1241a9c];; void JavaThread::run()+0x534 V [libjvm.so+0xfc9a28];; java_start+0x1ac Java frames: (J=compiled Java code, j=interpreted, Vv=VM code) j gc.huge.quicklook.memory.LargeHeap02.helper.create(I)V+1 j gc.huge.quicklook.memory.LargeHeap02.helper.run()V+4 v ~StubRoutines::call_stub
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