This bug was found by St.Petersburg Java SQE team (by Alexander Kuzmin).


The java.io.FileOutputStream.FileOutputStream(FileDescriptor) constructor
does not work properly with null parameter.

It creates new object but attempt to work with this stream
causes 'segmantation violation' crash & core dump.

_______________________Example___________________________

import java.io.*;
public class badtests {

  public static void main( String argv[] ) {

   FileDescriptor fd=null;
   FileOutputStream testfile=null;
 
    try {
    testfile=new FileOutputStream(fd);
    }
  catch (SecurityException e)
  {System.out.println("SecurityException - all OK !");}
  catch (Exception e)
  {System.out.println(" Unexpected "+e+" thrown ");}

   System.out.println("------------------------------");
   System.out.println("Exceptions not catched and..");
   System.out.println();
   System.out.println();

   try {
   testfile.write(100); // will cause crash
   } catch (Throwable e )
   {System.out.println(" Error :"+e);}
    System.out.println("All OK !");
    
  }

}
______________________ Output ______________________________________
Exceptions not catched and..


SIGSEGV 11* segmentation violation
    si_signo [11]: SIGSEGV 11* segmentation violation
    si_errno [0]: Error 0
    si_code [1]: SEGV_ACCERR [addr: 0x0]

stackbase=EFFFF524, stackpointer=EFFFDA08

Full thread dump:
    "Finalizer thread" (TID:0xee3003b0, sys_thread_t:0xef490de0) prio=1
    "Async Garbage Collector" (TID:0xee300368, sys_thread_t:0xef4c0de0) prio=1
    "Idle thread" (TID:0xee300320, sys_thread_t:0xef4f0de0) prio=0
    "clock handler" (TID:0xee3001f8, sys_thread_t:0xef5b0de0) prio=11
    "main" (TID:0xee3000a0, sys_thread_t:0x76eb8) prio=5 *current thread*
badtests.main(badtests.java:24)
Monitor Cache Dump:
    unknown key (key=0xef4c0de0): unowned
Waiting to be notified:
"Async Garbage Collector"
Registered Monitor Dump:
    Finalize me queue lock: unowned
Waiting to be notified:
"Finalizer thread"
    Thread queue lock: unowned
    Class lock: unowned
    Java stack lock: unowned
    Code rewrite lock: unowned
    Heap lock: unowned
    Has finalization queue lock: unowned
    Monitor IO lock: unowned
    Child death monitor: unowned
    Event monitor: unowned
    I/O monitor: unowned
    Alarm monitor: unowned
Waiting to be notified:
"clock handler"
    Sbrk lock: unowned
    Monitor cache lock: unowned
    Monitor registry: monitor owner: "main"
Thread Alarm Q:
    sys_thread_t 0xef4c0de0 [Timeout in 824 ms]
Abort
____________________________________________________________________
  

david.a.brown@Eng 1996-12-10