[Bug general/4663] New: TaskObserver.Instruction doesn't appear to unblock on new process' first instructions

[Bug general/4663] New: TaskObserver.Instruction doesn't appear to unblock on new process' first instructions

[mcvet at redhat dot com]

When calling Manager.host.requestCreateAttachedProc() and handling the 
resulting return from the AttachedObserver; adding an InstructionObserver to 
the Task, removing the AttachedObserver, and then attemping to step appears to 
never return from the EventLoop.

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           Summary: TaskObserver.Instruction doesn't appear to unblock on
                    new process' first instructions
           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: mark at klomp dot org,mcvet at redhat dot com
OtherBugsDependingO 3346
             nThis:


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[Bug general/4663] TaskObserver.Instruction doesn't appear to unblock on new process' first instructions

[mcvet at redhat dot com]

------- Additional Comments From mcvet at redhat dot com  2007-06-19 21:26 -------
(FC6 x86_64)

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[Bug general/4663] TaskObserver.Instruction doesn't appear to unblock on new process' first instructions

[mark at klomp dot org]

------- Additional Comments From mark at klomp dot org  2007-06-20 12:23 -------
I think I see the problem. When we ask to step onto the very first instruction
for some reason the stepping debug flag isn't set in the isa debug registers.
This means we interpret the trap event as a real trap signal which we pass on to
the process which gets instantly killed...

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[Bug general/4663] TaskObserver.Instruction doesn't appear to unblock on new process' first instructions

[cagney at redhat dot com]

------- Additional Comments From cagney at redhat dot com  2007-06-20 15:12 -------
why does fstep work?  It goes through the same sequence.  Or if it isn't it
would be a bug :-)

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[Bug general/4663] TaskObserver.Instruction doesn't appear to unblock on new process' first instructions

[mark at klomp dot org]

------- Additional Comments From mark at klomp dot org  2007-06-20 15:18 -------
Added a simplified test and a first workaround for this issue.

2007-06-20  Mark Wielaard  <mwielaard@redhat.com>

        * frysk-core/frysk/proc/Observation.java (toString): Include
        observable and observer.

        * frysk-core/frysk/proc/Task.java (just_started): New boolean field.

        * frysk-core/frysk/proc/TestTaskObserverInstruction.java
        (testFirstInstructionStep): New test)
        (StepAttachedObserver): New inner class.
        (testFirstInstructionSteppingEngine): Renamed method from
        testFirstInstructionStep. Remove broken marker.

2007-06-20  Mark Wielaard  <mwielaard@redhat.com>

        * frysk-core/frysk/proc/ptrace/LinuxTaskState.java
        (blockOrAttachContinue): Set just_started marker.
        (sendContinue): Reset just_started marker unless first step.
        (Running.handleTrapped): Check and reset just_started marker.

Keeping open to resolve with a real Stepping state and after consulting on other
debug step marker corner cases. 

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           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|frysk-bugzilla at sourceware|mark at klomp dot org
                   |dot org                     |
             Status|NEW                         |ASSIGNED


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