[Vm-dev] [unix] 4.10.2.2614 segfaults on ARM

[David T. Lewis]

Resending attachment with image header information, plus a zip of the
same, in case my mail system is causing the problem.

Dave


On Wed, Oct 09, 2013 at 02:09:47PM -0400, David T. Lewis wrote:
>  
> Tim, could you try running this DrGeo image on an interpreter VM for RISC OS?
> 
> I don't have an ARM machine to test, and I'm afraid that it is going to require
> a debugger (gdb) to sort this one out.
> 
> That said, here are some ideas:
> 
> My first thought was that this might be a plugin issue. But noting that
> the segfault happens right after the display window opens, and before
> much of anything else happens, and also noting that -1799995044 negative
> number in the error output, I am inclined to think it is failing in the
> process of loading the image and fixing up addresses from the disk image,
> or very shortly thereafter. This is a format 6504 image, which means that
> there is no issue of reordering floats during this process, but the VM
> still needs to scan through the entire object memory to fix object pointers
> before it can do anything else, so perhaps the failure is happening at
> around that point.
> 
> I took a look at the image file header and don't see anything of obvious
> concern. The image was saved from an interpreter VM, so there is no
> possibility of Cog related issues. I am attaching the header information
> in case it prompts any ideas from others.
> 
> Things that someone can try without resorting to gdb:
> 
> It would be good to verify whether other images fail in the same way,
> or whether this is in some way specific to the DrGeo image. Perhaps someone
> can take a recent Squeak image, save it from an interpreter VM (to make
> sure that it is in 6504 format like DrGeo), and see if it runs on
> the OLPC X0-1.75 machine. If it works, then we know the problem is
> in some way associated with the DrGeo image, otherwise (and more likely)
> it is associated with the VM.
> 
> On the OLPC X0-1.75, try deleting (or renaming) the external VM plugins.
> Then see if it is possible to start the DrGeo image. If there is a problem
> in one of the plugins, this could help identify it.
> 
> If someone has a different ARM Linux box (maybe a Raspberry Pi?), then
> check and see if DrGeo works at that platform.
> 
> On the OLPC X0-1.75, try using the "-memory" command line option to
> the VM. Pick a few reasonable looking values, and see if one of them
> accidentally causes the VM to start working. Rationale: If the problem
> is somehow associated with initial load of the image file into memory,
> then fiddling around with this setting might cause the symptoms to change
> or possibly even go away.
> 
> HTH,
> Dave
> 
> On Wed, Oct 09, 2013 at 03:27:44PM +0200, Bert Freudenberg wrote:
> > 
> > The same image works fine using the interpreter on x86, and on various other VMs. Here's the drgeo.image, inside a zip renamed to .xo:
> > 
> > https://gforge.inria.fr/frs/download.php/30585/DrGeoII-12.04.xo
> > 
> > (original report below)
> > 
> > Any idea what might be wrong?
> > 
> > - Bert -
> > 
> > Begin forwarded message:
> > 
> > > From: "Daniel Drake [via Dr. Geo Forum]" <ml-node+s996172n4024197h7 at n3.nabble.com>
> > > Subject: Running on OLPC XO-1.75 (ARM)
> > > Date: 8. Oktober 2013 23:41:32 MESZ
> > > To: bert <bert at freudenbergs.de>
> > > 
> > > Hi, 
> > > 
> > > I am trying to run DrGeo on OLPC XO-1.75 using the Sugar activity provided. 
> > > 
> > > This fails to launch because the Sugar activity includes an x86 Squeak VM. I modified the launcher script to use the system-wide Squeak VM (we have 4.10.2.2614, also used for Scratch and Etoys) but without success. 
> > > 
> > > Now, I briefly see a window, then it crashes with: 
> > > Segmentation fault 
> > > -1799995044 UndefinedObject>? 
> > > Segmentation fault 
> > > 
> > > Any ideas or things I can try? I guess the squeak VM we are running there is much newer than the one shipped in the Sugar activity - maybe there is a new drgeo image that I could try against the new VM? 
> > > 
> > > Thanks 
> > > Daniel 
> > > 
> > > 


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