`nix build` (first-time home-manager build) fails with SIGSEGV

So I recently wiped my laptop to change its filesystem from btrfs to ext4, hoping for a little performance improvement (every bit counts at its age). I was able to re-partition my disk and re-install NixOS smoothly on my laptop. (Here's my NixOS config.)

But I cannot build my home-manager configuration.

I manage my home-manager config with flakes. To build it for the first time on a fresh system, I'm trying to use nix build --no-link ~/.config/nixpkgs/#homeConfigurations.<machine_name>.activationPackage. However, this fails with an address boundary error (SIGSEGV).

I haven't found anything online about this. I've tried running it with env GC_DONT_GC=1, but that didn't fix the issue.

Here's an strace that might help.

Thank you in advance for any help, workarounds, or suggestions :)

Edit: Got some gdb output as well