Details

    • Subcomponent:
    • Resolved In Build:
      b70
    • CPU:
      generic
    • OS:
      linux

      Backports

        Description

        Our automated tests encountered this. Although it will be difficult to
        reproduce, it looks like a simple deadlock between a monitor lock and a
        ReentrantLock in the AWT clipboard support.

        Deadlock detected:
        ==================
        "System clipboard synchronizer":
          waiting to lock sun.awt.X11.XClipboard@59383e0f
          which is held by "AWT-EventQueue-0"
        "AWT-EventQueue-0":
          waiting to lock
        java.util.concurrent.locks.ReentrantLock$NonfairSync@2943444d
          which is held by "AWT-XAWT"
        "AWT-XAWT":
          waiting to lock java.lang.Object@7ac3597e
          which is held by "AWT-EventQueue-0"

        Stacks for threads in question:

        "AWT-EventQueue-0" Id=15 WAITING on
        java.util.concurrent.locks.ReentrantLock$NonfairSync@2943444d owned by
        "AWT-XAWT" Id=12
        at sun.misc.Unsafe.park(Native Method)
        - waiting on java.util.concurrent.locks.ReentrantLock$NonfairSync@2943444d
        at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:870)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1199)
        at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:209)
        at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:285)
        at sun.awt.SunToolkit.awtLock(SunToolkit.java:253)
        at sun.awt.X11.XRootWindow.getInstance(XRootWindow.java:36)
        at sun.awt.X11.XBaseWindow.getXAWTRootWindow(XBaseWindow.java:412)
        at sun.awt.X11.XClipboard.registerClipboardViewerChecked(XClipboard.java:166)
        - locked java.lang.Object@7ac3597e
        at sun.awt.datatransfer.SunClipboard.addFlavorListener(SunClipboard.java:377)
        - locked sun.awt.X11.XClipboard@59383e0f
        ...

        "AWT-XAWT" Id=12 BLOCKED on java.lang.Object@7ac3597e owned by
        "AWT-EventQueue-0" Id=15
        at sun.awt.X11.XClipboard$CheckChangeTimerTask.run(XClipboard.java:180)
        - blocked on java.lang.Object@7ac3597e
        at sun.awt.X11.XToolkit.callTimeoutTasks(XToolkit.java:1922)
        at sun.awt.X11.XToolkit.run(XToolkit.java:558)
        at sun.awt.X11.XToolkit.run(XToolkit.java:523)
        at java.lang.Thread.run(Thread.java:745)
        Number of locked synchronizers = 1
        - java.util.concurrent.locks.ReentrantLock$NonfairSync@2943444d

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                • Assignee:
                  anashaty Anton Nashatyrev (Inactive)
                  Reporter:
                  shadowbug Shadow Bug
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                  • Created:
                    Updated:
                    Resolved: