C2 crash in Matcher::xform

Data location:

ssh to cores2-da-x64-1.central or cores2-da-x64-2.central

%/cores_data/local/bin/acl grant 2-8201969

% cd /cores/2-8201969/2011-02-07_6u18

core.java.21532.1297065707 -- sub dir containing core file & associated lib files
hs_err_pid21532.log
pstack.21532.txt
A crash in C2 on 6u18 GA 64 bit Solaris X64 server JVM.

fffffd7ffe81a09c Node*Matcher::xform(Node*,int) () + 21c
fffffd7ffe841a43 void Matcher::match() () + 703
fffffd7ffe8434ce void Compile::Code_Gen() () + 1be
fffffd7ffea7d790 Compile::Compile #Nvariant
1(ciEnv*,C2Compiler*,ciMethod*,int,bool,bool) () + f60
fffffd7ffe8616b6 void C2Compiler::compile_method(ciEnv*,ciMethod*,int)
() + a6
fffffd7ffe8611f6 void
CompileBroker::invoke_compiler_on_method(CompileTask*) () + 766
fffffd7ffe8e99f8 void CompileBroker::compiler_thread_loop() () + 6b8
fffffd7ffe8e6969 void compiler_thread_entry(JavaThread*,Thread*) () + 9
fffffd7ffe8a5c7d void JavaThread::thread_main_inner() () + 4d
fffffd7ffe8a5a2a void JavaThread::run() () + 10a
fffffd7ffeddf679 java_start () + 1f9
fffffd7fff310bfb _thr_setup () + 5b
fffffd7fff310e30 _lwp_start ()