Customer application had 5 crashes, using 6.0u6 JVM on linux-amd64 platform.
All crashes have identical stack trace but on different CompileTasks.

OS:Red Hat Enterprise Linux Server release 5.2 (Tikanga)
vm_info: Java HotSpot(TM) 64-Bit Server VM (10.0-b22) for linux-amd64 JRE (1.6.0_06-b02)

Decoded stacks :

V [libjvm.so+0x1d5751] OopFlow::build_oop_map(Node*, int, PhaseRegAlloc*, int*)
+0x101
V [libjvm.so+0x1d549a] OopFlow::compute_reach(PhaseRegAlloc*, int, Dict*)+0x24a
V [libjvm.so+0x1d5d0c] Compile::BuildOopMaps()+0x34c
V [libjvm.so+0x50ab05] Compile::Output()+0x2b5
V [libjvm.so+0x24479b] Compile::Code_Gen()+0x55b
V [libjvm.so+0x2410f5] Compile::Compile(ciEnv*, C2Compiler*, ciMethod*, int, bo
ol)+0x7c5
V [libjvm.so+0x1e05f7] C2Compiler::compile_method(ciEnv*, ciMethod*, int)+0x67
V [libjvm.so+0x248f88] CompileBroker::invoke_compiler_on_method(CompileTask*)+0
x298
V [libjvm.so+0x248926] CompileBroker::compiler_thread_loop()+0x306
V [libjvm.so+0x62a7a9] compiler_thread_entry(JavaThread*, Thread*)+0x9
V [libjvm.so+0x624a51] JavaThread::run()+0x111
V [libjvm.so+0x50628a] java_start(Thread*)+0x14a

hs_err files are in attachment.