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  1. JDK
  2. JDK-4026405

Setting breakpoints in remote debugging crashes the debugger

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    • Subcomponent:
    • CPU:
      unknown
    • OS:
      generic

      Description

      mei.chan@Corp 1997-01-16
      Debugging a java application on a remote site, with jdb, giving
      a host and password, seems to work a little bit. You can
      connect to the running program and print its list of classes,
      but setting a breakpoint crashes it. Running this program
      remotely with "java -debug loop"
       
      import java.lang.*;
       
      public class loop {
       
        public static void main (String argv[]) {
          for(int i=0; ; i++) {
            System.out.println("i=" + i);
            try {
              Thread.sleep(2*1000);
            } catch (Exception e) {
            }
          }
        }
      }
       
      commands like "suspend", "resume", "threads", "locals", and
      "classes" work, but this causes a crash:
       
      suspend
      stop at loop:9
      resume
       
      The messages are:
       
      SIGSEGV 11* segmentation violation
          si_signo [11]: SIGSEGV 11* segmentation violation
          si_errno [0]: Error 0
          si_code [1]: SEGV_ACCERR [addr: 0xde7a8]
       
              stackbase=EE2D9000, stackpointer=EE2D76A0
       
      Full thread dump:
          "main" (TID:0xee7a1860, sys_thread_t:0xee2d8de0, state:R) prio=5
      *current thread*
              loop.main(loop.java:7)
              sun.tools.debug.MainThread.run(Agent.java:55)
          "main" (TID:0xee7a0f20, sys_thread_t:0xee2fade0, state:MS) prio=5
              loop.main(loop.java:9)
              sun.tools.debug.MainThread.run(Agent.java:55)
          "Breakpoint handler" (TID:0xee79f868, sys_thread_t:0xee31cde0,
      state:CW) prio=9
              sun.tools.debug.BreakpointQueue.nextEvent(BreakpointQueue.java)
             
      sun.tools.debug.BreakpointHandler.run(BreakpointHandler.java:187)
          "Debugger agent" (TID:0xee793dd0, sys_thread_t:0xee33ede0, state:CW)
      prio=10
              java.net.SocketInputStream.read(SocketInputStream.java:92)
              java.io.BufferedInputStream.fill(BufferedInputStream.java)
              java.io.BufferedInputStream.read(BufferedInputStream.java)
              java.io.FilterInputStream.read(FilterInputStream.java)
              sun.tools.debug.Agent.run(Agent.java:343)
              java.lang.Thread.run(Thread.java)
          "Finalizer thread" (TID:0xee78f2f8, sys_thread_t:0xee3a5de0,
      state:CW) prio=1
          "Async Garbage Collector" (TID:0xee78f2b0, sys_thread_t:0xee3c7de0,
      state:MS) prio=1
          "Idle thread" (TID:0xee78f268, sys_thread_t:0xee3e9de0, state:R)
      prio=0
          "clock handler" (TID:0xee78f180, sys_thread_t:0xee40bde0, state:CW)
      prio=11
          "main" (TID:0xee78f150, sys_thread_t:0x465b0, state:MS) prio=5
              loop.main(loop.java:9)
      Monitor Cache Dump:
               java.io.BufferedInputStream@EE79F980/EE828600
      (key=0xee79f980): monitor owner ee33ede0: "Debugger agent"
               sun.tools.debug.BreakpointQueue@EE79F898/EE827D98
      (key=0xee79f898): unowned
              Waiting to be notified:
                  "Breakpoint handler"
               unknown key (key=0x465b0): unowned
               unknown key (key=0xee2fade0): unowned
               unknown key (key=0xee3c7de0): unowned
      Registered Monitor Dump:
          Finalize me queue lock: unowned
              Waiting to be notified:
                  "Finalizer thread"
          Thread queue lock: unowned
          Name and type hash table lock: unowned
          String intern lock: unowned
          JNI global reference lock: unowned
          BinClass lock: unowned
          Class loading 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 expansion lock: unowned
          Monitor registry: monitor owner ee2d8de0: "main"
      Thread Alarm Q:
      Abort
       
      In this case the machine where I was running "jdb" was
      Windows 95, and the remote machine was Solaris.

      The problem also reproduces if jdb runs on Solaris.

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              Assignee:
              mr Mark Reinhold
              Reporter:
              mchansunw Mei Chan (Inactive)
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