[Bug general/4260] New: ptrace complains about monitor stack tracing

["mcvet at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

With terminating, fork, exec and clone observers on nautilus, and then making 
it fork, it prints into the background:

Call stack is broken - couldn't unwind!
ptrace: No such process
   at frysk.sys.Errno.throwErrno(FryskGui)
   at frysk.sys.Ptrace$PtraceThread.notifyPtraceThread(FryskGui)
   at frysk.sys.Ptrace.peekRegisters(FryskGui)
   at frysk.sys.RegisterSetBuffer.refresh(FryskGui)
   at frysk.sys.RegisterSetBuffer.peek(FryskGui)
   at inua.eio.ByteBuffer.peekFully(FryskGui)
   at inua.eio.ByteBuffer.get(FryskGui)
   at frysk.proc.Register.get(FryskGui)
   at frysk.rt.StackCallbacks.accessReg(FryskGui)
   at lib.unwind.StackTraceCreator.unwind_setup(FryskGui)
   at lib.unwind.StackTraceCreator.createStackTrace(FryskGui)
   at frysk.rt.StackFactory.createStackFrame(FryskGui)
   at frysk.rt.StackFactory.createStackFrame(FryskGui)
   at frysk.gui.monitor.actions.CaptureStackFrameAction.execute(FryskGui)
   at frysk.gui.monitor.actions.TaskActionPoint.runActions(FryskGui)
   at frysk.gui.monitor.observers.TaskCloneObserver.runActionsParent(FryskGui)
   at frysk.gui.monitor.observers.TaskCloneObserver.bottomHalfParent(FryskGui)
   at frysk.gui.monitor.observers.TaskCloneObserver$1.run(FryskGui)
   at org.gnu.glib.CustomEvents.runEvents(libgtkjava-2.8.so)

Which is likely caused by either the process not being blocked properly, or 
some other inconsistency with the Task being unwound.

-- 
           Summary: ptrace complains about monitor stack tracing
           Product: frysk
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: general
        AssignedTo: frysk-bugzilla at sourceware dot org
        ReportedBy: mcvet at redhat dot com
                CC: swagiaal at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=4260

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