The test java/lang/instrument/IsModifiableClassAgent.java has discovered a bug that happens on fastdebug on all platforms:

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/opt/jprt/T/P1/213000.amurillo/s/src/share/vm/oops/klassVtable.hpp:163), pid=14849, tid=139756971468544
# assert(method != NULL) failed: use clear
#
# JRE version: Java(TM) SE Runtime Environment (8.0-b77) (build 1.8.0-ea-fastdebug-b77)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.0-b19-internal-201302152130.amurillo.hs25-b19-snapshot-fastdebug compiled mode linux-amd64 compressed oops)
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# 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 (0x00007f1bb0198800): VMThread [stack: 0x00007f1bb493a000,0x00007f1bb4a3b000] [id=14864]

Stack: [0x00007f1bb493a000,0x00007f1bb4a3b000], sp=0x00007f1bb4a39470, free space=1021k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0xd975e2] VMError::report_and_die()+0x302
V [libjvm.so+0x67b9d4] report_vm_error(char const*, int, char const*, char const*)+0x84
V [libjvm.so+0x9e86af] klassVtable::put_method_at(Method*, int)+0x10f
V [libjvm.so+0x9ecb4a] klassVtable::initialize_vtable(bool, Thread*)+0x57a
V [libjvm.so+0x9d42c8] VM_RedefineClasses::redefine_single_class(_jclass*, Klass*, Thread*)+0x418
V [libjvm.so+0x9d48d3] VM_RedefineClasses::doit()+0xb3
V [libjvm.so+0xdc0999] VM_Operation::evaluate()+0x89
V [libjvm.so+0xdbde51] VMThread::evaluate_operation(VM_Operation*)+0xb1
V [libjvm.so+0xdbf0c0] VMThread::loop()+0x660
V [libjvm.so+0xdbf2f0] VMThread::run()+0xb0
V [libjvm.so+0xb6e7f8] java_start(Thread*)+0x108

VM_Operation (0x00007f1bb7e65520): RedefineClasses, mode: safepoint, requested by thread 0x00007f1bb000f000

ILW = MMM => p3

Link to failure:
http://vmsqe-app.russia.sun.com/surl/Rf

Matching rule:
RULE java/lang/instrument/IsModifiableClassAgent.java Crash Internal Error ...klassVtable.hpp...assert(method != NULL) failed: use clear