hydra-eval-jobs crashes with SIGSEGV when evaluating a specific nixos toplevel

[linyinfeng]

Describe the bug

hydra-eval-jobs crashes with SIGSEGV when evaluating my nixos toplevel when I am using niri-flake's config.lib.niri.actions in my configuration.

The same toplevel can be successfully evaluated using nix.

Remove config.lib.niri.actions from my configuration (the commit), the toplevel can be successfully evaluated.

I created a gist holding the coredump information and I host the core file in https://static.li7g.com/hydra-eval-jobs.core.zst.

To Reproduce

Steps to reproduce the behavior: https://gist.github.com/linyinfeng/b94fea3293dabe14bf9246f5a05fc541#file-reproduce-sh

Expected behavior

No coredump.

Hydra Server:

github:nixos/nixpkgs/99dc8785f6a0adac95f5e2ab05cc2e1bf666d172#hydra (current (2024-09-19) nixos-unstable)

Additional context

The crash happens in libnixexpr.so. So the issue seems to be highly related to https://github.com/nixos/nix, but I can not reproduce the same behavior with nix.

[Mic92]

@linyinfeng can you reproduce the same issue with nix-eval-jobs? It could be a stack overflow.

[linyinfeng]

@linyinfeng can you reproduce the same issue with nix-eval-jobs? It could be a stack overflow.

I tried the following command. It outputted nothing (except some warnings/fetching information) and exited with status code 0.

$ nix shell github:nixos/nixpkgs/99dc8785f6a0adac95f5e2ab05cc2e1bf666d172#nix-eval-jobs \
  --command \
  nix-eval-jobs \
  --flake github:linyinfeng/dotfiles/de751ffa5f6d27ef32753bab263f13ca7c47fe1e#hydraJobs
warning: unknown setting 'allowed-users'
warning: unknown setting 'extra-allowed-users'
warning: unknown setting 'trusted-users'
warning: `--gc-roots-dir' not specified

By adding --debug to the command I saw logs like this:

...
instantiated 'libunistring-1.2.tar.gz' -> '/nix/store/kq0mb8gd9zmblcf568vc6k6dlgmp6l09-libunistring-1.2.tar.gz.drv'
performing daemon worker op: 7
instantiated 'libunistring-1.2' -> '/nix/store/yxrg0x043lp0pyijblwbm89vbyqrfbm8-libunistring-1.2.drv'
performing daemon worker op: 7
instantiated 'libidn2-2.3.7.tar.gz' -> '/nix/store/jnfrr555w6xpqvwyvcav4r86yi4dyb10-libidn2-2.3.7.tar.gz.drv'
performing daemon worker op: 7
instantiated 'libidn2-2.3.7' -> '/nix/store/sngcd3gqdqqg8rbszrwh0qjf9mlpmx62-libidn2-2.3.7.drv'
performing daemon worker op: 7
instantiated 'glibc-2.39.tar.xz' -> '/nix/store/gxv8zyycd4g400h51gfzpg0isk3b7qqd-glibc-2.39.tar.xz.drv'
performing daemon worker op: 7
instantiated 'glibc-2.39-52' -> '/nix/store/ca3ks9a7cahwg0rn27pz3hf1h60r16sc-glibc-2.39-52.drv'
performing daemon worker op: 1
performing daemon worker op: 1
evaluating file '/nix/store/5nl0s0d4v9y2bjf80hrb476lys3dci00-source/modules/modules.nix'
killing process 179616