This problem can manifest as one of the following (depending on the exact code shape and build type):

# SIGSEGV (0xb) at pc=0x00007f7a7b737d6e, pid=44537, tid=44643

Stack: [0x00007f78a99e2000,0x00007f78a9ae3000], sp=0x00007f78a9adde00, free space=1007k
Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0xa1bd6e] PhaseIdealLoop::build_loop_late_post(Node*)+0x13e
V [libjvm.so+0xa1c133] PhaseIdealLoop::build_loop_late(VectorSet&, Node_List&, Node_Stack&)+0x133
V [libjvm.so+0xa1e9b2] PhaseIdealLoop::build_and_optimize(bool, bool)+0x7c2
V [libjvm.so+0x60546f] Compile::Optimize()+0x46f
V [libjvm.so+0x607227] Compile::Compile(ciEnv*, C2Compiler*, ciMethod*, int, bool, bool, bool, DirectiveSet*)+0x1087
V [libjvm.so+0x531fc2] C2Compiler::compile_method(ciEnv*, ciMethod*, int, DirectiveSet*)+0x1d2
V [libjvm.so+0x60f2bc] CompileBroker::invoke_compiler_on_method(CompileTask*)+0x41c
V [libjvm.so+0x610143] CompileBroker::compiler_thread_loop()+0x273
V [libjvm.so+0xce62e8] JavaThread::thread_main_inner()+0xd8
V [libjvm.so+0xce6618] JavaThread::run()+0x2e8
V [libjvm.so+0xb647c2] thread_native_entry(Thread*)+0xf2


# SIGSEGV (0xb) at pc=0x00007f62e4ca0cd8, pid=10145, tid=0x00007f62cee51700

Stack: [0x00007f62ced51000,0x00007f62cee52000], sp=0x00007f62cee4d460, free space=1009k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x40bcd8] PhaseChaitin::gather_lrg_masks(bool)+0x208
V [libjvm.so+0x40ef3a] PhaseChaitin::Register_Allocate()+0x71a
V [libjvm.so+0x4a3810] Compile::Code_Gen()+0x260
V [libjvm.so+0x4a6091] Compile::Compile(ciEnv*, C2Compiler*, ciMethod*, int, bool, bool, bool)+0x14b1
V [libjvm.so+0x3f2a75] C2Compiler::compile_method(ciEnv*, ciMethod*, int)+0x1f5
V [libjvm.so+0x4b05da] CompileBroker::invoke_compiler_on_method(CompileTask*)+0xc9a
V [libjvm.so+0x4b1586] CompileBroker::compiler_thread_loop()+0x5d6
V [libjvm.so+0xa761a3] JavaThread::thread_main_inner()+0x103
V [libjvm.so+0xa762ec] JavaThread::run()+0x11c
V [libjvm.so+0x926ed8] java_start(Thread*)+0x108
C [libpthread.so.0+0x7e9a] start_thread+0xda


# Internal Error (/scratch/HUDSON/workspace/9-2-build-linux-amd64-phase2/jdk9/6205/hotspot/src/share/vm/opto/loopnode.cpp:3565), pid=44718, tid=44826
# assert(false) failed: Bad graph detected in build_loop_late

Stack: [0x00007fac00a74000,0x00007fac00b75000], sp=0x00007fac00b6f310, free space=1004k
Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x16c9aa2] VMError::report_and_die(int, char const*, char const*, __va_list_tag*, Thread*, unsigned char*, void*, void*, char const*, int, unsigned long)+0x162
V [libjvm.so+0x16ca82f] VMError::report_and_die(Thread*, char const*, int, char const*, char const*, __va_list_tag*)+0x2f
V [libjvm.so+0xaa1e4d] report_vm_error(char const*, int, char const*, char const*, ...)+0xdd
V [libjvm.so+0x1178515] PhaseIdealLoop::build_loop_late_post(Node*)+0x285
V [libjvm.so+0x1178a7b] PhaseIdealLoop::build_loop_late(VectorSet&, Node_List&, Node_Stack&)+0x10b
V [libjvm.so+0x117d344] PhaseIdealLoop::build_and_optimize(bool, bool)+0x904
V [libjvm.so+0xa10afd] Compile::Optimize()+0x50d
V [libjvm.so+0xa12a1e] Compile::Compile(ciEnv*, C2Compiler*, ciMethod*, int, bool, bool, bool, DirectiveSet*)+0x124e
V [libjvm.so+0x844162] C2Compiler::compile_method(ciEnv*, ciMethod*, int, DirectiveSet*)+0x2e2
V [libjvm.so+0xa1dcb6] CompileBroker::invoke_compiler_on_method(CompileTask*)+0x3d6
V [libjvm.so+0xa1e951] CompileBroker::compiler_thread_loop()+0x2b1
V [libjvm.so+0x162e31e] JavaThread::thread_main_inner()+0x22e
V [libjvm.so+0x162e5ae] JavaThread::run()+0x1ce
V [libjvm.so+0x137ee82] thread_native_entry(Thread*)+0x112


# Internal Error (/scratch/HUDSON/workspace/9-2-build-linux-amd64-phase2/jdk9/6205/hotspot/src/share/vm/opto/chaitin.cpp:264), pid=44984, tid=45090
# Error: assert(src) failed

Stack: [0x00007f81182bc000,0x00007f81183bd000], sp=0x00007f81183b7d60, free space=1007k
Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x16c9aa2] VMError::report_and_die(int, char const*, char const*, __va_list_tag*, Thread*, unsigned char*, void*, void*, char const*, int, unsigned long)+0x162
V [libjvm.so+0x16ca82f] VMError::report_and_die(Thread*, char const*, int, char const*, char const*, __va_list_tag*)+0x2f
V [libjvm.so+0xaa1e4d] report_vm_error(char const*, int, char const*, char const*, ...)+0xdd
V [libjvm.so+0x8896de] PhaseChaitin::Union(Node const*, Node const*)+0x48e
V [libjvm.so+0x9a21b2] PhaseCoalesce::combine_these_two(Node*, Node*)+0x4b2
V [libjvm.so+0x9a266c] PhaseAggressiveCoalesce::coalesce(Block*)+0x1dc
V [libjvm.so+0x9a29d2] PhaseCoalesce::coalesce_driver()+0x42
V [libjvm.so+0x894ae4] PhaseChaitin::Register_Allocate()+0x2b4
V [libjvm.so+0xa0dfe9] Compile::Code_Gen()+0x3a9
V [libjvm.so+0xa12ada] Compile::Compile(ciEnv*, C2Compiler*, ciMethod*, int, bool, bool, bool, DirectiveSet*)+0x130a
V [libjvm.so+0x844162] C2Compiler::compile_method(ciEnv*, ciMethod*, int, DirectiveSet*)+0x2e2
V [libjvm.so+0xa1dcb6] CompileBroker::invoke_compiler_on_method(CompileTask*)+0x3d6
V [libjvm.so+0xa1e951] CompileBroker::compiler_thread_loop()+0x2b1
V [libjvm.so+0x162e31e] JavaThread::thread_main_inner()+0x22e
V [libjvm.so+0x162e5ae] JavaThread::run()+0x1ce
V [libjvm.so+0x137ee82] thread_native_entry(Thread*)+0x112