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  1. JDK
  2. JDK-4070437

Core dump in is_instance_of() (Solaris and Windows NT)

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P2
    • Resolution: Won't Fix
    • Affects Version/s: 1.1.4
    • Fix Version/s: None
    • Component/s: hotspot
    • Labels:
    • Subcomponent:
    • CPU:
      generic
    • OS:
      solaris_2.5

      Description

      Here's the deal: Assume there's an applet that takes a classname as
      a parameter. It does a Class.forName() on that parameter, then does
      an instanceof test against an interface I. Two instances of this applet
      appear on an HTML page, one is passed class A, one class B.

      Interface I is at the top of the inheritance hierarchy; there's a class
      C that implements I. Both A and B inherit from C.

      If you load this HTML page from file:, no problem. If you load it from
      javaweb (such that getting the bytes takes a bit of time), hard crash
      every time. This happens on both Windows NT and Solaris. Synchronize on
      a static object around the Class.forName() call, and the problem goes
      away. If the instanceof test is against C instead of I, no crash. If
      C is taken out of the inheritance hierarchy, no crash.

      Here's what the C stack looks like:

         start_func(0xef719c00, 0xed9c2658, 0xef6fe45c, 0x0, 0x0, 0x0)
         ThreadRT0(0xed9c2658, 0xef730970, 0x0, 0x0, 0x0, 0x0)
         execute_java_dynamic_method(0xecbe1ca4, 0xed9c2658, 0xef73096c,
       0xef730970, 0xef733000, 0x0)
         do_execute_java_method_vararg(0xecbe1ca4, 0xef730971, 0x0, 0x0,
       0x0, 0x3a5450)
         finish_invokevirtual(0x39e107, 0xecbe1ca4, 0x3a558c, 0x3a5550,
       0x39da10, 0x3a5560)
         is_instance_of()
         --- Signal SIGSEGV raised ---
         --- Signal SIGSEGV raised ---sysAbort(0x0, 0xecbe2000, 0xecbe1698,
       0xb, 0x0, 0x0)
        _lwp_kill(0x0, 0x6, 0x3921, 0xef72b5bc, 0x16, 0x0)


      The code to reproduce this is in ~billf/public_html/instanceof/.



      Original bug:

          See http://parched/~brucew/BUGS/CoreBug2 to recreate problem where HJB
          core dumps when applets can't load a class file.
          See attached file for Segmentation Violation details.
          See ~brucew/public_html/BUGS/CoreBug2 for "core" file.

      bill.foote@Eng 1997-08-07

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            Assignee:
            Unassigned Unassigned
            Reporter:
            duke J. Duke (Inactive)
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