Reported by Goetz Lindenmaier:

on ppc, I see immediate bugs in g1:
 
ppc_vm/bin/java -XX:+UseG1GC -XX:SurvivorRatio=4 -classpath …/benchmarks/jvm98/ SPECjvm98All …/benchmarks/jvm98/ jvm98.log.txt jvm98.result.txt javac
 
# Internal Error (/sapmnt/home1/d045726/oJ/g1Bug-hs-comp/src/share/vm/oops/oop.inline.hpp:199), pid=1554, tid=4398079689280
# assert(check_obj_alignment(result)) failed: address not aligned: 0x00000000baadbabe
 
V [libjvm.so+0xaa5150] report_vm_error(char const*, int, char const*, char const*)+0xdc
V [libjvm.so+0x78e738] oopDesc::decode_heap_oop_not_null(unsigned int)+0x11c
V [libjvm.so+0x78e7f8] oopDesc::decode_heap_oop(unsigned int)+0x6c
V [libjvm.so+0xc41238] void G1SATBCardTableModRefBS::write_ref_field_pre_static<unsigned int>(unsigned int*, oopDesc*)+0x7c
V [libjvm.so+0xc412cc] void G1SATBCardTableModRefBS::inline_write_ref_field_pre<unsigned int>(unsigned int*, oopDesc*)+0x40
V [libjvm.so+0xc41354] G1SATBCardTableModRefBS::write_ref_field_pre_work(unsigned int*, oopDesc*)+0x44
V [libjvm.so+0x8dadcc] void BarrierSet::write_ref_field_pre<unsigned int>(unsigned int*, oopDesc*)+0xac
V [libjvm.so+0x1195044] void ObjArrayKlass::do_copy<unsigned int>(arrayOopDesc*, unsigned int*, arrayOopDesc*, unsigned int*, int, Thread*)+0x3f4
V [libjvm.so+0x1191c68] ObjArrayKlass::copy_array(arrayOopDesc*, int, arrayOopDesc*, int, int, Thread*)+0x27c
V [libjvm.so+0xeac84c] JVM_ArrayCopy+0xff51fc1c
J 17 java.lang.System.arraycopy(Ljava/lang/Object;ILjava/lang/Object;II)V (0 bytes) @ 0x00000400021bd104 [0x00000400021bd000+0x104]
j spec.benchmarks._213_javac.Parser.exprArgs(I)[Lspec/benchmarks/_213_javac/Expression;+23
j spec.benchmarks._213_javac.Parser.parseMethodExpression(Lspec/benchmarks/_213_javac/Expression;Lspec/benchmarks/_213_javac/Identifier;)Lspec/benchmarks/_213_javac/Expression;+69
j spec.benchmarks._213_javac.Parser.parseExpression()Lspec/benchmarks/_213_javac/Expression;+426

Can be reproduced on x64.

ILW=H (crash) L (rare) H (no workaround) = P2