JDK 8 JVMTI spec. 1.2.3 (http://download.java.net/jdk8/docs/platform/jvmti/jvmti.html) states:
Agent Start-Up (Live phase)
...
If an agent is started during the live phase then its agent library must export a start-up function with the following prototype:
JNIEXPORT jint JNICALL 
Agent_OnAttach(JavaVM* vm, char *options, void *reserved)
Or for a statically linked agent named 'L':
JNIEXPORT jint JNICALL 
Agent_OnAttach_L(JavaVM* vm, char *options, void *reserved)
The VM will start the agent by calling this function. 
....
According to this assertion the VM will never call Agent_OnAttach_L if the function exists and the agent library is dynamically linked.

This issue causes a failure of 366 JCK 8 tests (JCK-7301996)
Error log is:
--''--
Successfully attached to JVM with id: 15050
Native agent successfully loaded:  name=jckjvmti  opts=ascl00101
Agent_OnAttach_jckjvmti entry was unexpectedly invoked
--''--
Source file that returns "failed" status is JCK-runtime-8/src/javasoft/sqe/jck/lib/jvmti/Agent.java 
Appropriate code snippet is:

if (isOnAttachMode) {
            if (isJckjvmtiStaticallyLinked) {
                if (!isAgentOnAttachForJckJvmtiInvoked()) {
                    out.println("Agent_OnAttach_jckjvmti entry was not invoked as expected\n");
                    status = STAT_FAILED;
                    return false;
                }
                if (isAgentOnAttachInvoked()) {
                    out.println("Agent_OnAttach entry was unexpectedly invoked");
                    status = STAT_FAILED;
                    return false;
                }
            } else {
                if (!isAgentOnAttachInvoked()) {
                    out.println("Agent_OnAttach entry was not invoked as expected");
                    status = STAT_FAILED;
                    return false;
                }
                if (isAgentOnAttachForJckJvmtiInvoked()) {
                    out.println("Agent_OnAttach_jckjvmti entry was unexpectedly invoked");
                    status = STAT_FAILED;
                    return false;
                }
            }

            if (isAgentOnLoadInvoked()) {
                out.println("Agent_OnLoad entry was unexpectedly invoked");
                status = STAT_FAILED;
                return false;
            }
            if (isAgentOnLoadForJckJvmtiInvoked()) {
                out.println("Agent_OnLoad_jckjvmti entry was unexpectedly invoked\n");
                status = STAT_FAILED;
                return false;
            }
        }

Note: This issue only happens on Mac OS X  (10.9.1)