Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8252657

JVMTI agent is not unloaded when Agent_OnAttach is failed

    Details

    • Type: Bug
    • Status: Open
    • Priority: P4
    • Resolution: Unresolved
    • Affects Version/s: 16
    • Fix Version/s: 16
    • Component/s: hotspot
    • Labels:
      None

      Description

      If Agent_OnAttach() in JVMTI agent which is attempted to load via JVMTI.agent_load dcmd is failed, it would not be unloaded.

      How to reproduce:

      1. Build JVMTI agent for test
        $ git clone https://github.com/YaSuenag/jvmti-examples.git
        $ cd jvmti-examples/helloworld/out/build
        $ cmake ../..

      2. Run JShell

      3. Load JVMTI agent via `jcmd <PID> JVMTI.agent_load` with "error" ("error" means Agent_OnAttach() returns JNI_ERR)

        $ jcmd
        89456 jdk.jshell.execution.RemoteExecutionControl 45651
        89547 sun.tools.jcmd.JCmd
        89436 jdk.jshell/jdk.internal.jshell.tool.JShellToolProvider
        $ jcmd 89436 JVMTI.agent_load `pwd`/libhelloworld.so error
        89436:
        return code: -1

      4. Check loaded libraries via `jcmd <PID> VM.dynlibs`

      $ jcmd 89436 VM.dynlibs | grep libhelloworld
      7f2f8b06b000-7f2f8b06c000 r--p 00000000 fd:00 11818202 /home/ysuenaga/github/jvmti-examples/helloworld/out/build/libhelloworld.so
      7f2f8b06c000-7f2f8b06d000 r-xp 00001000 fd:00 11818202 /home/ysuenaga/github/jvmti-examples/helloworld/out/build/libhelloworld.so
      7f2f8b06d000-7f2f8b06e000 r--p 00002000 fd:00 11818202 /home/ysuenaga/github/jvmti-examples/helloworld/out/build/libhelloworld.so
      7f2f8b06e000-7f2f8b06f000 r--p 00002000 fd:00 11818202 /home/ysuenaga/github/jvmti-examples/helloworld/out/build/libhelloworld.so
      7f2f8b06f000-7f2f8b070000 rw-p 00003000 fd:00 11818202 /home/ysuenaga/github/jvmti-examples/helloworld/out/build/libhelloworld.so

        Attachments

          Issue Links

            Activity

              People

              • Assignee:
                ysuenaga Yasumasa Suenaga
                Reporter:
                ysuenaga Yasumasa Suenaga
              • Votes:
                0 Vote for this issue
                Watchers:
                1 Start watching this issue

                Dates

                • Created:
                  Updated: