Indeed, it was one for these situations, and it got resolved with a clean build.
Thanks again to both of you for helping out with this.

-Kostas

On Thu, Jul 28, 2011 at 12:23 AM, Beckmann, Brad <[email protected]> wrote:
> Yeah, after I sent that last email I thought that it might be related to the
> fact that I did a clean build, not updating to the latest repo.  Over the
> past 3-4 months I’ve noticed several random swig errors that are fixed by
> trying a clean build.  I hope this is just another one of those situations.
>
>
>
> Brad
>
>
>
>
>
> From: Steve Reinhardt [mailto:[email protected]]
> Sent: Wednesday, July 27, 2011 5:35 PM
> To: Konstantinos Aisopos
> Cc: Beckmann, Brad; gem5 Developer List
>
> Subject: Re: [gem5-dev] Review Request: GARNET: adding a fault model for
> resilient on-chip network research.
>
>
>
> Can you try a clean build (rm -rf build)?  When Brad said that it broke for
> him in an older version, but worked at the head, I tried to track it down
> and couldn't reliably reproduce it in any version up to over a month old.
>  But I did see it once, which makes me wonder if it's just some stale build
> glitch.
>
>
>
> Steve
>
> On Wed, Jul 27, 2011 at 4:49 PM, Konstantinos Aisopos
> <[email protected]> wrote:
>
> hi Steve and Brad,
>
> I updated to the latest version of the repo and the problem persists.
>
> Specifically, I did the same experiment Steve suggested (added the
> same 2 lines in src/sim/System.py and src/sim/system.cc) and I got the
> same segmentation fault I get when I add an integer vector into my
> fault model python file:
>
> ----------------------------
> kaisopos@hermes1:~/GEM5_Fault_Model/gem5$ build/ALPHA_SE/gem5.debug
>
> configs/example/se.py
> gem5 Simulator System.  http://gem5.org
> gem5 is copyrighted software; use the --copyright option for details.
>
> gem5 compiled Jul 27 2011 19:23:03
> gem5 started Jul 27 2011 19:24:15
> gem5 executing on hermes1
>
> command line: build/ALPHA_SE/gem5.debug configs/example/se.py
> Global frequency set at 1000000000000 ticks per second
>
> Traceback (most recent call last):
>  File "<string>", line 1, in <module>
>  File "/data/lsp/kaisopos/GEM5_Fault_Model/gem5/src/python/m5/main.py",
> line 356, in main
>    exec filecode in scope
>
>  File "configs/example/se.py", line 199, in <module>
>    Simulation.run(options, root, system, FutureClass)
>  File
> "/data/lsp/kaisopos/GEM5_Fault_Model/gem5/configs/common/Simulation.py",
> line 235, in run
>    m5.instantiate(checkpoint_dir)
>
>  File "/data/lsp/kaisopos/GEM5_Fault_Model/gem5/src/python/m5/simulate.py",
> line 78, in instantiate
>    for obj in root.descendants(): obj.createCCObject()
>  File "/data/lsp/kaisopos/GEM5_Fault_Model/gem5/src/python/m5/SimObject.py",
> line 881, in createCCObject
>    self.getCCParams()
>  File "/data/lsp/kaisopos/GEM5_Fault_Model/gem5/src/python/m5/SimObject.py",
>
> line 840, in getCCParams
>    assert not len(vec)
> TypeError: object of type 'PySwigObject' has no len()
>
> ----------------------------
>
> I am using the latest code (I did "hg pull -u" right before compiling)
> I am using Python 2.5.2 and SWIG 1.3.36
> If the same code worked for both of you, the problem has to be either
> Python or SWIG, right?
> or is there any other possible explanation? any other thoughts?
>
> thanks all of you for helping out,
> -Kostas
>
> On Wed, Jul 27, 2011 at 4:38 PM, Steve Reinhardt <[email protected]> wrote:
>> Weird... I don't see any changes in the last three weeks that would have
>> affected that.
>> Thanks for figuring that out though, Brad.
>> Steve
>>
>> On Wed, Jul 27, 2011 at 1:27 PM, Beckmann, Brad <[email protected]>
>> wrote:
>>>
>>> Hi Konstantinos,
>>>
>>> FYI, I was able to reproduce your error when I used a 3-week old version
>>> of the repo.  However, I updated to the latest version of the repo and
>>> the
>>> problem appears fixed.  I can now reproduce the correct behavior that
>>> Steve
>>> observed.
>>>
>>> Brad
>>>
>>>
>>> > -----Original Message-----
>>> > From: [email protected] [mailto:gem5-dev-
>>> > [email protected]] On Behalf Of Steve Reinhardt
>>> > Sent: Wednesday, July 27, 2011 8:25 AM
>>> > To: Konstantinos Aisopos; Default
>>> > Subject: Re: [gem5-dev] Review Request: GARNET: adding a fault model
>>> > for
>>> > resilient on-chip network research.
>>> >
>>> > (Getting this off of reviewboard so it's easier to reply...)
>>> >
>>> > Hi Konstantinos,
>>> >
>>> > I just made this change at the head of the tree:
>>> >
>>> > diff --git a/src/sim/System.py b/src/sim/System.py
>>> > --- a/src/sim/System.py
>>> > +++ b/src/sim/System.py
>>> > @@ -44,6 +44,8 @@
>>> >      def swig_objdecls(cls, code):
>>> >          code('%include "python/swig/system.i"')
>>> >
>>> > +    test = VectorParam.Int([1, 2, 3], "")
>>> > +
>>> >      physmem = Param.PhysicalMemory("Physical Memory")
>>> >      mem_mode = Param.MemoryMode('atomic', "The mode the memory
>>> > system is
>>> > in")
>>> >      memories = VectorParam.PhysicalMemory(Self.all, "All memories is
>>> > the
>>> > system")
>>> > diff --git a/src/sim/system.cc b/src/sim/system.cc
>>> > --- a/src/sim/system.cc
>>> > +++ b/src/sim/system.cc
>>> > @@ -83,6 +83,8 @@
>>> >      // add self to global system list
>>> >      systemList.push_back(this);
>>> >
>>> > +    cprintf("%s.test: len %d, %d\n", name(), p->test.size(),
>>> > + p->test[0]);
>>> > +
>>> >      /** Keep track of all memories we can execute code out of
>>> >       * in our system
>>> >       */
>>> >
>>> >
>>> > and it worked:
>>> >
>>> > % build/ALPHA_SE/gem5.debug configs/example/se.py
>>> > gem5 Simulator System.  http://gem5.org
>>> > gem5 is copyrighted software; use the --copyright option for details.
>>> >
>>> > gem5 compiled Jul 27 2011 08:19:34
>>> > gem5 started Jul 27 2011 08:19:42
>>> > gem5 executing on phenom
>>> > command line: build/ALPHA_SE/gem5.debug configs/example/se.py Global
>>> > frequency set at 1000000000000 ticks per second
>>> > system.test: len 3, 1
>>> > 0: system.remote_gdb.listener: listening for remote gdb #0 on port 7000
>>> > **** REAL SIMULATION ****
>>> > info: Entering event queue @ 0.  Starting simulation...
>>> > info: Increasing stack size by one page.
>>> > Hello world!
>>> > hack: be nice to actually delete the event here Exiting @ tick 3256000
>>> > because target called exit()
>>> >
>>> > So it's not clear to me why it's not working for you... are you at the
>>> > tip of the
>>> > gem5 repository?  What versions of Python and SWIG are you using?  I
>>> > have
>>> > 2.6.5 and 1.3.40, respectively.
>>> >
>>> > Steve
>>> > _______________________________________________
>>> > gem5-dev mailing list
>>> > [email protected]
>>> > http://m5sim.org/mailman/listinfo/gem5-dev
>>>
>>>
>>> _______________________________________________
>>> gem5-dev mailing list
>>> [email protected]
>>> http://m5sim.org/mailman/listinfo/gem5-dev
>>
>>
>
>
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