[Vm-dev] Segfaults from #copyStack

[Max Leske]

Thanks Eliot.


On 24 February 2018 at 22:15:21, vm-dev-request at lists.squeakfoundation.org (
vm-dev-request at lists.squeakfoundation.org) wrote:

Hi Max,

On Sat, Feb 24, 2018 at 1:07 PM <http://airmail.calendar/2018-02-24
13:07:00 CET>, Max Leske <maxleske at gmail.com> wrote:

>
> Hi,
>
> I'm seeing many segfaults (around 20 to 30% of the time) when running Fuel
> builds on Linux. Everytime I see it it's caused by #copyStack (e.g.
> https://travis-ci.org/theseion/Fuel/jobs/345741310). AFAICT it happens
> more often (exclusively?) on 32 bit with Pharo 7 (latest VM + latest
image).
>

Try and construct a test case that crashes without user interaction. i.e.
something that starts up with a known image, supplying a script to load via
Fuel. Once this crashes reliably debugging is easy. Otherwise its very
hard. As soon as you have the crashing test case let me know and I'll take
a look. Ideally it would run on Mac OS X.


I've tried for the last two hours to come up with a reliable way of
triggering the segfault but haven't had any luck. I can only reproduce it
on Linux, not macOS and I've only been able to force the segfault with
using smalltalkCI:

git clone https://github.com/hpi-swa/smalltalkCI.git && git clone
https://github.com/theseion/Fuel.git && smalltalkCI/run.sh -s Pharo-alpha
Fuel/.default.ston

I used Ubuntu 17.04 (32-bit), TravisCI uses 14.04.5 (64-bit).

Maybe there's a way I can extract some information you can use? And then
I'll just play mole whacking until I trigger it... :)

Cheers,
Max
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