C1: assert(!is_index((intptr_t)runtime_address)) failed: must not look like an index

Nightly test failure in GC_Baseline: an assertion failure in C1 while generating code.

Analysis Page:
http://sqeweb.sfbay.sun.com/nfs/results/vm/gtee/JDK7/NIGHTLY/VM/2010-12-21/GC_Baseline/vm/windows-i586/client/mixed/windows-i586_vm_client_mixed_vm.gc.testlist/analysis.html

Results Dir:
R:/results/vm/gtee/JDK7/NIGHTLY/VM/2010-12-21/GC_Baseline/vm/windows-i586/client/mixed/windows-i586_vm_client_mixed_vm.gc.testlist

Test:
gc/lock/malloc/malloclock03

Description:
Assertion failure..
[2010-12-22T07:29:16.12] # Actual: C:/local/common/jdk/baseline/windows-i586/bin/java -client -Xmixed -XX:-PrintVMOptions -XX:+StartAttachListener -XX:DefaultMaxRAMFraction=8 -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:-UseGCOverheadLimit gc.lock.LockerTest -gp1 byteArr -lockers malloc
[2010-12-22T07:29:16.12] # To suppress the following error report, specify this argument
[2010-12-22T07:29:16.94] # after -XX: or in .hotspotrc: SuppressErrorAt=\relocInfo.cpp:474
[2010-12-22T07:29:16.94] #
[2010-12-22T07:29:16.94] # A fatal error has been detected by the Java Runtime Environment:
[2010-12-22T07:29:16.94] #
[2010-12-22T07:29:16.94] # Internal Error (C:\temp\jprt\P1\B\020431.ap31282\source\src\share\vm\code\relocInfo.cpp:474), pid=5972, tid=10168
[2010-12-22T07:29:16.94] # assert(!is_index((intptr_t)runtime_address)) failed: must not look like an index
[2010-12-22T07:29:16.94] #
[2010-12-22T07:29:16.94] # JRE version: 7.0-b122
[2010-12-22T07:29:16.94] # Java VM: OpenJDK Client VM (20.0-b04-internal-201012200204.ap31282.hotspot-g1-push-fastdebug mixed mode, sharing windows-x86 )
[2010-12-22T07:29:16.94] # An error report file with more information is saved as:
[2010-12-22T07:29:16.94] # c:\local\40724.JDK7.NIGHTLY.VM+windows-i586_vm_client_mixed_vm.gc.testlist\results\ResultDir\malloclock03\hs_err_pid5972.log
[2010-12-22T07:29:16.94] #
[2010-12-22T07:29:16.94] # If you would like to submit a bug report, please visit:
[2010-12-22T07:29:16.94] # http://java.sun.com/webapps/bugreport/crash.jsp
[2010-12-22T07:29:16.94] #

Stack Trace:
--------------- T H R E A D ---------------

Current thread (0x009d8400): JavaThread "C1 CompilerThread0" daemon [_thread_in_native, id=10168, stack(0x03f30000,0x04030000)]

Stack: [0x03f30000,0x04030000], sp=0x0402ed5c, free space=1019k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
Warning: This error log is *not* generated by the following JVM:
           C:/local/common/jdk/baseline/windows-i586/jre/bin/client/jvm.dll
         JVM symbol lookup may be incorrect.
         Please use --jvm=<path/to/jvm> to point to the correct JVM.

V [jvm.dll+0x2397aa];; ?report_and_die@VMError@@QAEXXZ+0x54a
V [jvm.dll+0x231ec5];; ?report_vm_error@@YAXPBDH00@Z+0x45
V [jvm.dll+0x6934d];; ?runtime_address_to_index@Relocation@@KAHPAE@Z+0x2d
V [jvm.dll+0x69684];; ?pack_data_to@external_word_Relocation@@UAEXPAVCodeSection@@@Z+0x14
V [jvm.dll+0x6b13d];; ?initialize@relocInfo@@QAEXPAVCodeSection@@PAVRelocation@@@Z+0x3d
V [jvm.dll+0x3af4];; ?relocate@CodeSection@@QAEXPAEABVRelocationHolder@@H@Z+0x1a4
V [jvm.dll+0x2516da];; ?emit_operand@Assembler@@AAEXPAVRegisterImpl@@00W4ScaleFactor@Address@@HABVRelocationHolder@@H@Z+0x48a
V [jvm.dll+0x254258];; ?leal@Assembler@@QAEXPAVRegisterImpl@@VAddress@@@Z+0x78
V [jvm.dll+0x2844b7];; ?generate_code_for@Runtime1@@CAPAVOopMapSet@@W4StubID@1@PAVStubAssembler@@@Z+0x1f17
V [jvm.dll+0x3ce8e3];; ?generate_blob_for@Runtime1@@CAXPAVBufferBlob@@W4StubID@1@@Z+0xe3
V [jvm.dll+0x3cea79];; ?initialize@Runtime1@@SAXPAVBufferBlob@@@Z+0x19
V [jvm.dll+0x37d92e];; ?initialize_all@Compiler@@SAXXZ+0x2e
V [jvm.dll+0x37d96c];; ?initialize@Compiler@@UAEXXZ+0x1c
V [jvm.dll+0x71881];; ?invoke_compiler_on_method@CompileBroker@@CAXPAVCompileTask@@@Z+0x301
V [jvm.dll+0x72800];; ?compiler_thread_loop@CompileBroker@@SAXXZ+0x440
V [jvm.dll+0x20e599];; ?thread_main_inner@JavaThread@@QAEXXZ+0xb9
V [jvm.dll+0x24c584];; ?java_start@@YGIPAVThread@@@Z+0xc4
C [msvcr100.dll+0x5c6de]
C [msvcr100.dll+0x5c788]
C [kernel32.dll+0x4d0e9]
C [ntdll.dll+0x419bb]
C [ntdll.dll+0x4198e]


Current CompileTask:
C1: 358 1 java.lang.String.hashCode()I (67 bytes)


--------------- P R O C E S S ---------------

Java Threads: ( => current thread )
  0x009e6800 JavaThread "Low Memory Detector" daemon [_thread_new, id=5292, stack(0x00000000,0x00000000)]
=>0x009d8400 JavaThread "C1 CompilerThread0" daemon [_thread_in_native, id=10168, stack(0x03f30000,0x04030000)]

The failure has only been seen on windows.