Bissecting tells that the problem appeared in
https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/1675e3586bbef2ff198e683ea7839ac1b41fa491

That is somewhere between VMMaker.oscog-eem.2079 (excluded) and VMMaker.oscog-eem.2126

Quite a large range, but stack.v3 works and spur works too, so not all changes are relevant...

2017-02-28 2:26 GMT+01:00 Nicolas Cellier <nicolas.cellier.aka.nice@gmail.com>:

Hi,

I can't open an image with recent squeak.cog.v3 builds (at least on macosx).

The VM hangs in a sort of infinite loop with 100% CPU before the window open

If I sample the application I get something like

...snip...

The squeak.stack.v3 still works.

The hang is reproducible in simulator:

| cos |
cos := CogVMSimulator newWithOptions: #(Cogit StackToRegisterMappingCogit ).
cos desiredNumStackPages: 8.
cos openOn: '/some_path_to/Squeak4.6-15102.image'.
cos openAsMorph; run

it hangs around counters 13000/993
and I've got this kind of output:

...snip...

each time I interrupt the VM, it seems to loop in findMethodWithPrimitive:FromFP:UpToContext:

I did not try to bissect when this happened, but the red status of continuous integration may well be related to this.

We can't live forever with this red status, it's like not having CI feedback at all. Either we declare cog.v3 as unsupported or we fix it.