SIGSEGV in PhaseIdealLoop::build_loop_late_post on T5440

Application client crashes with

# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0xffffffff7e463aa8, pid=15413, tid=53
#
# JRE version: 7.0-b147
# Java VM: Java HotSpot(TM) 64-Bit Server VM (21.0-b17 mixed mode solaris-sparc compressed oops)
# Problematic frame:
# V [libjvm.so+0x863aa8] void PhaseIdealLoop::build_loop_late_post(Node*)+0x510

Stack: [0xfffffff967400000,0xfffffff967500000], sp=0xfffffff9674f9bd0, free space=998k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x863aa8] void PhaseIdealLoop::build_loop_late_post(Node*)+0x510
V [libjvm.so+0x860e7c] void PhaseIdealLoop::build_and_optimize(bool)+0xdfc
V [libjvm.so+0x2522f4] void Compile::Optimize()+0x5c4
V [libjvm.so+0x501d20] Compile::Compile(ciEnv*,C2Compiler*,ciMethod*,int,bool,bool)+0x11c8
V [libjvm.so+0x24c054] void C2Compiler::compile_method(ciEnv*,ciMethod*,int)+0xac
V [libjvm.so+0x24d324] void CompileBroker::invoke_compiler_on_method(CompileTask*)+0xd8c
V [libjvm.so+0x2cacd0] void CompileBroker::compiler_thread_loop()+0x928
V [libjvm.so+0xa2b550] void JavaThread::thread_main_inner()+0x40
V [libjvm.so+0x9285ac] java_start+0x2b4


Current CompileTask:
C2: 11447 2 % ! atg.core.net.URLHammerThread::run @ 1706 (2785 bytes)