# Internal Error (/home/roland/valhalla/src/hotspot/share/ci/ciInlineKlass.cpp:52), pid=2898322, tid=2898332
# assert(contains_field_offset(offset)) failed: invalid field offset

Stack: [0x00007f851b03a000,0x00007f851b13b000], sp=0x00007f851b135080, free space=1004k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x8e92c4] ciInlineKlass::field_index_by_offset(int)+0x134
V [libjvm.so+0xea4ee6] InlineTypeBaseNode::field_value_by_offset(int, bool) const+0x36
V [libjvm.so+0x14e9445] LoadNode::Identity(PhaseGVN*)+0x1e5
V [libjvm.so+0x16c3ca2] PhaseIterGVN::transform_old(Node*)+0x2f2
V [libjvm.so+0x16bcc3e] PhaseIterGVN::optimize()+0x7e
V [libjvm.so+0xa460ac] Compile::inline_incrementally_cleanup(PhaseIterGVN&)+0x75c
V [libjvm.so+0xa505c9] Compile::inline_incrementally(PhaseIterGVN&)+0x289
V [libjvm.so+0xa50e89] Compile::Optimize()+0x359
V [libjvm.so+0xa53c56] Compile::Compile(ciEnv*, ciMethod*, int, bool, bool, bool, bool, bool, DirectiveSet*)+0x1656
V [libjvm.so+0x847f00] C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0x6a0
V [libjvm.so+0xa63e59] CompileBroker::invoke_compiler_on_method(CompileTask*)+0xc39
V [libjvm.so+0xa64ab8] CompileBroker::compiler_thread_loop()+0x518
V [libjvm.so+0x19776fc] JavaThread::thread_main_inner()+0x27c
V [libjvm.so+0x197dcb0] Thread::call_run()+0x100
V [libjvm.so+0x162e574] thread_native_entry(Thread*)+0x104

Failure occurs in LoadNode::Identity()
base is a CheckCastPP to java/lang/String
base->in(1) is an InlineTypePtr
base->in(0) is an If projection for a test that checks the class of base->in(1) and the type of the CheckCastPP are the same

That test should constant fold and the branch where the LoadNode is be removed but that hasn't happened yet.