Bug: inject_kernel setup phase crashes in 3D hMG preconditioner about firedrake

[connorjward]

I've just taken a look at this. I think the key error message I found was:

Traceback (most recent call last):
  File "/home/connor/Code/firedrake-dev1/src/tsfc/gem/node.py", line 226, in __call__
    return self.cache[cache_key]

This shows us that the crash is happening inside TSFC and so I think our form compiler is struggling with something to do with your form/discretisation. I tried increasing this line by a factor of 100 (overkill) and it yielded a new error:

ModuleNotFoundError: No module named 'phmg'

I think it's unrelated so I suspect that increasing the stack limit might get your code to work.

Can you try increasing sys.setrecursionlimit and let us know if that stops the crash? It naturally is still an issue that we are doing so much recursion in our code generation, but at least it will verify where the problem is.

[Alexey-Voronin]

Upping the recursion limit fixed the problem. Thanks!

[Alexey-Voronin]

resolved