[Vm-dev] Pulse audio Scratch plugin causes seg fault on 64bit Ubuntu installation

Bert Freudenberg bert at freudenbergs.de
Wed Aug 8 14:43:01 UTC 2012

On 2012-08-08, at 03:06, David T. Lewis wrote:

> On Thu, Aug 02, 2012 at 05:36:42PM -0400, Amos Blanton wrote:
>> To reproduce:
>> 1. Execute Scratch using current VM and pulse plugin (on Ubuntu 12.04, 64
>> bit system):
>> Executing: /usr/lib/squeak/4.4.7-2357/squeakvm -encoding UTF-8
>> -vm-display-x11 -xshm -plugins
>> /usr/lib/scratch/plugins/:/usr/lib/squeak/4.4.7-2357/ -vm-sound-pulse
>> /usr/share/scratch/Scratch.image
>> (There is no pulse plugin in /usr/lib/scratch/plugins in my installation
>> package, so it must be using the one in /usr/lib/squeak/4.4.7-2357)
>> 2. Click "Sounds" tab, click play icon next to meow. That results in:
>> Segmentation fault
>> 10273532 [] in SoundPlayer class>playLoop
>> 10262332 Semaphore>critical:
>> 10262240 SoundPlayer class>playLoop
>> 10273228 [] in SoundPlayer class>startPlayerProcessBufferSize:rate:stereo:
>> 10273320 [] in BlockContext>newProcess
>> Aborted (core dumped)
>> Note that the same package on 32 bit systems does not produce the error
>> (playback and recording both work).
>> The issue is also described here:
>> https://bugs.launchpad.net/ubuntu/+source/squeak-vm/+bug/1009080
>> If someone can take a look and patch this, we'd very much appreciate it!
>> This is the last major (known) issue we've got with Scratch running on
>> Ubuntu.
>> -Amos
> I have a possible fix for this problem, but need some help to verify.
> The issue is tracked on Mantis http://bugs.squeak.org/view.php?id=7701
> I believe the problem is just some type declaration issues in the support
> code that result in pointers being stored in ints, hence VM crash. A
> potential fix is attached (and also on uploaded to the Mantis issue).
> I need someone to test the 64-bit compiled VM on Scratch with Ubuntu
> and pulse audio and see if the VM crashes are eliminated.
> Bert: Can I send you a compiled VM to test with Scratch/Etoys/Squeak
> and find out if sound still crashes the VM?

Please do.

I compiled my own from svn and that works, but I'd rather use the one compiled by you for Etoys-To-Go.

> Ian: Regardless of whether this fixes the Scratch problem, the type
> declarations in vm-sound-pulse need to be updated, so please consider
> the attached as a patch.
> Thanks,
> Dave
> <platforms-unix-sound-pulse-sqUnixSoundPulse.c.tar>

- Bert -

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