When running SPECjbb2013 on a fastdebug build I get the following crash:

#
# Internal Error (/localhome/hg/hs-gc-clean/src/share/vm/opto/compile.cpp:1662), pid=12975, tid=139818001143552
# assert(flat != TypePtr::BOTTOM) failed: cannot alias-analyze an untyped ptr
#
# JRE version: Java(TM) SE Runtime Environment (8.0_20-b22) (build 1.8.0_20-ea-fastdebug-b22)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (1.9.0-fastdebug-internal-hs-gc-clean mixed mode linux-amd64 compressed oops)
# Core dump written. Default location: /localhome/mgerdin/tests/rw/benchmarks/specjbb2013/core or core.12975
#
# If you would like to submit a bug report, please visit:
# http://bugreport.sun.com/bugreport/crash.jsp
#

--------------- T H R E A D ---------------

Current thread (0x00007f2b05851000): JavaThread "C2 CompilerThread1" daemon [_thread_in_native, id=13147, stack(0x00007f29ea3a9000,0x00007f29ea4aa000)]

Stack: [0x00007f29ea3a9000,0x00007f29ea4aa000], sp=0x00007f29ea4a3c20, free space=1003k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0xff8666] VMError::report(outputStream*)+0x1124
V [libjvm.so+0xff9c95] VMError::report_and_die()+0x411
V [libjvm.so+0x7b3188] report_vm_error(char const*, int, char const*, char const*)+0xb4
V [libjvm.so+0x7216bf] Compile::find_alias_type(TypePtr const*, bool, ciField*)+0x15f
V [libjvm.so+0x3b7376] Compile::alias_type(TypePtr const*, ciField*)+0x40
V [libjvm.so+0x6445e6] Compile::get_alias_index(TypePtr const*)+0x38
V [libjvm.so+0x72532a] Compile::final_graph_reshaping_impl(Node*, Final_Reshape_Counts&)+0x20e
V [libjvm.so+0x726ea3] Compile::final_graph_reshaping_walk(Node_Stack&, Node*, Final_Reshape_Counts&)+0x237
V [libjvm.so+0x7273b2] Compile::final_graph_reshaping()+0x184
V [libjvm.so+0x723f3c] Compile::Optimize()+0xd86
V [libjvm.so+0x71d650] Compile::Compile(ciEnv*, C2Compiler*, ciMethod*, int, bool, bool, bool)+0x11bc
V [libjvm.so+0x616c04] C2Compiler::compile_method(ciEnv*, ciMethod*, int)+0x118
V [libjvm.so+0x73ab72] CompileBroker::invoke_compiler_on_method(CompileTask*)+0x4e0
V [libjvm.so+0x73a09a] CompileBroker::compiler_thread_loop()+0x3c2
V [libjvm.so+0xf848f7] compiler_thread_entry(JavaThread*, Thread*)+0x66
V [libjvm.so+0xf7f0b1] JavaThread::thread_main_inner()+0x183
V [libjvm.so+0xf7ef0b] JavaThread::run()+0x189
V [libjvm.so+0xdbf103] java_start(Thread*)+0x1ca
C [libpthread.so.0+0x8182] start_thread+0xc2


Current CompileTask:
C2:4472860 12046 % 4 java.util.concurrent.ForkJoinPool$WorkQueue::growArray @ 83 (174 bytes)

It seems to regularly crash when osr-compiling that particular method at bci 83.

I=M, assert in fastdebug but product seems to run fine
L=H, assert fires every time the benchmark is run
W=H, no known workaround
=>P2