Hit java.lang.RuntimePermission createClassLoader while long run ISPRMGR VAR9

[thinkhy]

Hit below error while running ISPRMGR VAR9:

Lacked permission: (java.lang.RuntimePermission createClassLoader)
java.lang.SecurityException
at nachos.security.NachosSecurityManager.no(NachosSecurityManager.java:167)
at nachos.security.NachosSecurityManager.checkPermission(NachosSecurityManager.java:183)
at java.lang.SecurityManager.checkCreateClassLoader(SecurityManager.java:606)
at java.lang.ClassLoader.(ClassLoader.java:145)
at sun.reflect.DelegatingClassLoader.(DelegatingClassLoader.java:19)
at sun.reflect.DelegatingClassLoader.(DelegatingClassLoader.java:28)
at sun.reflect.ClassDefiner$1.run(ClassDefiner.java:54)
at java.security.AccessController.doPrivileged(AccessController.java:228)
at sun.reflect.ClassDefiner.defineClass(ClassDefiner.java:51)
at sun.reflect.MethodAccessorGenerator$1.run(MethodAccessorGenerator.java:437)
at java.security.AccessController.doPrivileged(AccessController.java:228)
at sun.reflect.MethodAccessorGenerator.generate(MethodAccessorGenerator.java:433)
at sun.reflect.MethodAccessorGenerator.generateMethod(MethodAccessorGenerator.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:54)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at java.lang.Class.lookupCachedConstructor(Class.java:2536)
at java.lang.Class.getConstructor(Class.java:305)
at nachos.machine.Lib.constructObject(Lib.java:507)
at nachos.userprog.UserProcess.newUserProcess(UserProcess.java:78)
at nachos.userprog.UserProcess.handleExec(UserProcess.java:891)
at nachos.userprog.UserProcess.handleSyscall(UserProcess.java:1085)
at nachos.userprog.UserProcess.handleException(UserProcess.java:1111)
at nachos.userprog.UserKernel.exceptionHandler(UserKernel.java:105)
at nachos.userprog.UserKernel$1.run(UserKernel.java:42)
at nachos.machine.Processor$MipsException.handle(Processor.java:603)
at nachos.machine.Processor.run(Processor.java:101)
at nachos.userprog.UThread.runProgram(UThread.java:31)
at nachos.userprog.UThread.access$000(UThread.java:11)
at nachos.userprog.UThread$1.run(UThread.java:20)
at nachos.threads.KThread.runThread(KThread.java:162)
at nachos.threads.KThread.access$000(KThread.java:30)
at nachos.threads.KThread$1.run(KThread.java:150)
at nachos.machine.TCB.threadroot(TCB.java:240)
at nachos.machine.TCB.access$100(TCB.java:25)
at nachos.machine.TCB$1.run(TCB.java:93)
at java.lang.Thread.run(Thread.java:738)

[thinkhy]

The problem is caused by TCB.authorizedDestroy

UserProcess.handleExit ==>
   ==> KThread.finish
       ==> AutoGrader.finishingCurrentThread
           ==> TCB.authorizedDestory which DOESN'T  kill a thread!