Diagnosing excessive memory usage / crash when compiling - 9.8.1

[Justin Bailey]

Hi!

I'm trying to upgrade our (large) codebase to use 9.8.1. (I'm on an M2).

When building with -01, memory on the GHC process climbs until it
reaches the limit of my machine (64G) and then crashes with a
segfault.

With -00, that does not happen.

How would I go about diagnosing what's happening? Using RTS flags to
limit the heap to 32G produced the same behavior, just faster.

Strangely, `-v5` does not produce any more output in the console
(passed via cabal's --ghc-options). Maybe I'm doing it wrong?

Pointers to existing issues or documentation welcome! Thank you!

Justin