[Vm-dev] Camera sig fault on 64 bits machines.

[Gustavo Duarte]

Hi Dave,

I followed your suggestion and could resolve this issue, thanks a lot.

Here the steps followed:

1) Uninstall, squeak-vm 64 bits comes with Ubuntu distribution, without 
its depends.

1) dpkg -r --force-no-depends squeak-vm

2) Download squeak-vm 32 bits.

wget http://www.squeakvm.org/unix/release/Squeak-4.10.2.2614-linux_i386.sh

sudo sh Squeak-4.10.2.2614-linux_i386.sh

Choice  as path prefix /usr instead default: /usr/local


3) Install 32 bits compatibility library:

sudo apt-get install ia32-libs

I know that is a workaround, the finally solution as you said, is update 
the plugins to working properly on 64 bit architectures.



Thank you very much !

Gustavo.




On 04/05/2014 12:44 PM, David T. Lewis wrote:
>
> On Sat, Apr 05, 2014 at 11:25:54AM -0300, Gustavo Duarte wrote:
>>
>> Hi folks,
>>
>> Imagen capture using web camera produces a a segmentation fault.
>>
>> I'm using:
>>
>> Squeak: 4.4.7
>> Scratch: 1.4.06
>> Plugins squeak-plugins-scratch: 1.4.0.2~svn.r83-1
>>
>>
>> My laptop is running Ubuntu 12.04 64 bits.
>>
>> Here the output stack trace.
>> ********************************************************************
>> gustavo at gusHP ~ $ scratch
>> Executing: padsp /usr/lib/squeak/4.4.7-2357/squeakvm -encoding UTF-8
>> -vm-display-x11 -fullscreen -plugins
>> /usr/lib/scratch/plugins/:/usr/lib/squeak/4.4.7-2357/ -vm-sound-oss
>> /usr/share/scratch/Scratch.image
>>
>> Segmentation fault
>>
>> 11283804 BitBlt>setDestForm:
>> 11283712 BitBlt class>toForm:
>> 11283464 WarpBlt class>toForm:
>> 11283372 ScratchCameraDialog>step
>> 11283256 Morph>stepAt:
>> 11280616 [] in PasteUpMorph>runStepMethods
>> 11280120 OrderedCollection>do:
>> 11280340 [] in PasteUpMorph>runStepMethods
>> 11279452 BlockContext>ifError:
>> 11279360 PasteUpMorph>runStepMethods
>> 11271628 PasteUpMorph>doOneCycleNow
>> 11271536 PasteUpMorph>doOneCycle
>> 4967012 [] in Project>spawnNewProcess
>> 4967104 [] in BlockContext>newProcess
>> Aborted
>> **********************************************
>>
>>
>> Where do you think could be the bug, on Squeak, Scratch or Plugin ?
>
> Hi Gustavo,
>
> This is probably a bug in the camera plugin. This plugin has not been
> updated to work properly in 64-bit mode, and it might well cause a crash
> like this.
>
> I think that you are probably using a VM that was compiled in 64-bit mode
> for an Ubuntu distribution. A 64-bit VM works fine for most Squeak users
> (I use one every day without problems). However, there are some plugins
> that do not yet work in 64-bit mode, and this causes problems if those
> plugins are used. For this reason, the VMs that are distributed from the
> squeakvm.org or squeak.org sites are compiled in 32-bit mode.
>
> If you can, please try installing a VM from http://squeakvm.org/unix/ and
> using that with Scratch. Because it is a 32-bit application, you may also
> need to install 32-bit compatibility libraries for Ubuntu. I think that
> this will probably resolve the camera plugin problem.
>
> I have also added a bug report on our Mantis bug tracker to follow up
> on this issue at http://bugs.squeak.org/view.php?id=7816
>
> Dave
>