We have an intermittent test failure with one of the XML tests that we believe comes down to a concurrency issue in JVM_AddModuleExports.

Attached to this bug is a stripped down test case that duplicates the issue most of the time. The test has 2 modules. Module jdk.test is in the boot layer. It creates a child layer with one module jdk.translet. Code in jdk.test uses core reflection to invoke a method in jdk.translet, this is turn makes a static call back to jdk.test. The test does this 10000 times and once in a while fails with IllegalAccessError in the access check on the callback.