The JVM dumped core while doing some auto-completion in NetBeans 7.0. Only seen once so far.

Here's what the top section of hs_err_pid says (the full file is attached):

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (c1_Optimizer.cpp:271), pid=20031, tid=7
# guarantee(x_compare_res != Constant::not_comparable) failed: incomparable constants in IfOp
#
# JRE version: 7.0-b139
# Java VM: Java HotSpot(TM) Client VM (21.0-b09 mixed mode, sharing solaris-x86 )
# Core dump written. Default location: /home/kh160127/core or core.20031
#
# If you would like to submit a bug report, please visit:
# http://bugreport.sun.com/bugreport/crash.jsp
#

--------------- T H R E A D ---------------

Current thread (0x080ee800): JavaThread "C1 CompilerThread0" daemon [_thread_in_native, id=7, stack(0xfb69f000,0xfb71f000)]

Stack: [0xfb69f000,0xfb71f000], sp=0xfb71dd70, free space=507k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x7cc05d] void VMError::report(outputStream*)+0x8f5
V [libjvm.so+0x7cd1e6] void VMError::report_and_die()+0x57a
V [libjvm.so+0x3f64fc] void report_vm_error(const char*,int,const char*,const char*)+0x40
V [libjvm.so+0x336ad2] Instruction*CE_Eliminator::make_ifop(Instruction*,Instruction::Condition,Instruction*,Instruction*,Instruction*)+0x4ca
V [libjvm.so+0x17c366] void CE_Eliminator::block_do(BlockBegin*)+0x58e
V [libjvm.so+0x17b919] void BlockBegin::iterate_preorder(boolArray&,BlockClosure*)+0x3d
V [libjvm.so+0x17bdab] void BlockBegin::iterate_preorder(boolArray&,BlockClosure*)+0x4cf
V [libjvm.so+0x17bdab] void BlockBegin::iterate_preorder(boolArray&,BlockClosure*)+0x4cf
V [libjvm.so+0x17bdab] void BlockBegin::iterate_preorder(boolArray&,BlockClosure*)+0x4cf
V [libjvm.so+0x17bdab] void BlockBegin::iterate_preorder(boolArray&,BlockClosure*)+0x4cf
V [libjvm.so+0x17bdab] void BlockBegin::iterate_preorder(boolArray&,BlockClosure*)+0x4cf
V [libjvm.so+0x17bdab] void BlockBegin::iterate_preorder(boolArray&,BlockClosure*)+0x4cf
V [libjvm.so+0x17b8b0] void BlockBegin::iterate_preorder(BlockClosure*)+0x564
V [libjvm.so+0x17b342] void IR::iterate_preorder(BlockClosure*)+0x2a
V [libjvm.so+0x17b2e5] void Optimizer::eliminate_conditional_expressions()+0x41
V [libjvm.so+0x17b273] void IR::optimize()+0x6b
V [libjvm.so+0x283eaf] Compilation::Compilation(AbstractCompiler*,ciEnv*,ciMethod*,int,BufferBlob*)+0x483
V [libjvm.so+0x1602f6] void Compiler::compile_method(ciEnv*,ciMethod*,int)+0x13a
V [libjvm.so+0x15aef7] void CompileBroker::invoke_compiler_on_method(CompileTask*)+0xb1b
V [libjvm.so+0x150dbf] void CompileBroker::compiler_thread_loop()+0xa23
V [libjvm.so+0x150393] void compiler_thread_entry(JavaThread*,Thread*)+0x1b
V [libjvm.so+0x13309f] void JavaThread::run()+0x2ff
V [libjvm.so+0x6accf0] java_start+0x4c8
C [libc.so.1+0xbb2cc] _thrp_setup+0x9d
C [libc.so.1+0xbb570] _lwp_start+0x0


Current CompileTask:
C1:87306808 12924 org.netbeans.api.java.source.SourceUtils::resolveImport (676 bytes)