Crash Report

[Randy1Burrell]

Describe the bug

lorri watch produces error

To Reproduce Steps to reproduce the behavior:

1. run lorri watch

Expected behavior

Expected the program to work.

Metadata

name = 'lorri'
operating_system = 'unix:OSX'
crate_version = '1.6.0'
explanation = '''
Panic occurred in file 'src/build_loop.rs' at line 238
'''
cause = '''
Unrecoverable error:
Io {
    msg: "AddRootError { source: Os { code: 13, kind: PermissionDenied, message: \"Permission denied\" }, msg: \"Failed to create missing nix user gc directory: /nix/var/nix/gcroots/per-user/randyburrell\" }",
}'''
method = 'Panic'
backtrace = '''

   0: 0x10e1958c3 - <unresolved>
   1: 0x10dff821e - <unresolved>
   2: 0x10df93077 - <unresolved>
   3: 0x10dfb4643 - <unresolved>
   4: 0x10e14a0e9 - <unresolved>
   5: 0x7ff80279f1d3 - __pthread_start'''

$ lorri info
GC roots exist, shell_gc_root: /Users/randyburrell/Library/Caches/com.github.nix-community.lorri.lorri.lorri/gc_roots/51c71c0c68ac338ce2c335cdd203134c/gc_root/shell_gc_root

$ uname -a
Darwin Randys-MacBook-Pro.local 22.5.0 Darwin Kernel Version 22.5.0: Mon Apr 24 20:51:50 PDT 2023; root:xnu-8796.121.2~5/RELEASE_X86_64 x86_64 i386 Darwin

Additional context

[nyarly]

Thanks for the report

[Randy1Burrell]

@nyarly do you have any idea what could be the possible fix? lorri is not updating my shell or environment whenever I change my nix config file.

I have darwin running and this is the shell output for launchctl list | grep nix

2597    0       org.nixos.lorri

darwin-configuration

{ config, pkgs, ... }:

{
  imports = [ ./lorri.nix ];
  # List packages installed in system profile. To search by name, run:
  # $ nix-env -qaP | grep wget
  environment.systemPackages =
    [ pkgs.vim
    ];

  # Use a custom configuration.nix location.
  # $ darwin-rebuild switch -I darwin-config=$HOME/.config/nixpkgs/darwin/configuration.nix
  # environment.darwinConfig = "$HOME/.config/nixpkgs/darwin/configuration.nix";

  # Auto upgrade nix package and the daemon service.
  services.nix-daemon.enable = true;
  # nix.package = pkgs.nix;

  # Create /etc/zshrc that loads the nix-darwin environment.
  programs.zsh.enable = true;  # default shell on catalina
  # programs.fish.enable = true;

  # Used for backwards compatibility, please read the changelog before changing.
  # $ darwin-rebuild changelog
  system.stateVersion = 4;
}

lorri.nix

{ config, pkgs, ... }:

let
  inherit (pkgs) lorri;

in {
  environment.systemPackages = [ lorri ];
  launchd.user.agents = {
    "lorri" = {
      serviceConfig = {
        WorkingDirectory = (builtins.getEnv "HOME");
        EnvironmentVariables = { };
        KeepAlive = true;
        RunAtLoad = true;
        StandardOutPath = "/var/tmp/lorri.log";
        StandardErrorPath = "/var/tmp/lorri.log";
      };
      script = ''
        source ${config.system.build.setEnvironment}
        exec ${lorri}/bin/lorri daemon
      '';
    };
  };
}

[nyarly]

That's a good question - I'll see how much help I can be. I'm less experienced with the Darwin environment.

Lorri wants to create a GC root for your project, and passes commands to Nix to do so. The error you're getting suggests there's a permissions issue creating the root at /nix/var/nix/gcroots/per-user/randyburrell - that may all be incredibly obvious already, but just establishing the root cause.

I'd check to see that nix-shell works with the project, and see what the permissions are on that directory - if it exists, even.

Lorri ought to have a better approach to handling this issue. We'd need to look into particulars about what it could do, though.

[ashebanow]

I'm seeing this same error every time I do a 'lorri watch', running on Windows/WSL2. I've included the toml file as text since github won't let me attach a TOML file. The original file name was "/tmp/report-2a9e5838-6784-43c0-92f0-e39b7ea898ca.toml".

name = 'lorri'
operating_system = 'unix:Ubuntu'
crate_version = '1.6.0'
explanation = '''
Panic occurred in file 'src/build_loop.rs' at line 238
'''
cause = '''
Unrecoverable error:
Io {
    msg: "AddRootError { source: Os { code: 13, kind: PermissionDenied, message: \"Permission denied\" }, msg: \"Failed to create missing nix user gc directory: /nix/var/nix/gcroots/per-user/ashebanow\" }",
}'''
method = 'Panic'
backtrace = '''

   0: 0x55b51245e2b6 - lorri::build_loop::BuildLoop::forever::h6bd3eba14169990d
   1: 0x55b512420e68 - std::panicking::try::h142838059837ff89
   2: 0x55b5124109f2 - std::sys_common::backtrace::__rust_begin_short_backtrace::h6f298be63434d7f3
   3: 0x55b512483809 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h7d1f44b2c36cceed
   4: 0x55b5125c5703 - std::sys::unix::thread::Thread::new::thread_start::h4514580219a899c5
   5: 0x7f979bd10e64 - start_thread
   6: 0x7f979bd929f0 - __GI___clone3
   7:        0x0 - <unresolved>'''

[ashebanow]

Oh, and I should add that manually creating the directory (as root) changes the error to:

Failed to symlink /home/ashebanow/.cache/lorri/gc_roots/3aada8720869adbdbdd99445d6f72682/gc_root/shell_gc_root to /nix/var/nix/gcroots/per-user/ashebanow/3aada8720869adbdbdd99445d6f72682-shell_gc_root

I then tried changing the owner of /nix/var/nix/gcroots/per-user/ashebanow to be ashebanow, and everything works.

[Randy1Burrell]

I decided to use another solution since lorri doesn't work for me

[ashebanow]

@nyarly Out of curiosity, was the bug actually fixed? If so, can you point me at the commit? I'm always interested in seeing how rust handles such situations.

[nyarly]

No - I closed it prematurely based on Randy's departure. I'll need to be able to characterize the issue better before I could work on it (although a PR would be appreciated.)

Missing per-user GC roots strikes me as something that needs consideration: in a working Nix system (even a per-user install), those directories should already exist. I'm not sure how you'd've installed Lorri in the first place without that?

[frprm]

I am facing the same issue and found some possible explanation here: https://github.com/NixOS/nix/issues/8564#issuecomment-1932315668.

[DianaOlympos]

facing probably the same thing, here is the crash report, I am going to try to see what I can do to fix it locally first

name = 'lorri'
operating_system = 'unix:Unknown'
crate_version = '1.6.0'
explanation = '''
Panic occurred in file 'src/build_loop.rs' at line 238
'''
cause = '''
Unrecoverable error:
Io {
    msg: "AddRootError { source: Os { code: 13, kind: PermissionDenied, message: \"Permission denied\" }, msg: \"Failed to create missing nix user gc directory: /nix/var/nix/gcroots/per-user/dianao\" }",
}'''
method = 'Panic'
backtrace = '''

   0: 0x564b4927f921 - lorri::build_loop::BuildLoop::forever::h94bef58eeed4c3e7
   1: 0x564b492779f7 - std::sys_common::backtrace::__rust_begin_short_backtrace::he06bfefd46870e6b
   2: 0x564b49295622 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h1a6233b6a69fd0c2
   3: 0x564b493e7a45 - std::sys::unix::thread::Thread::new::thread_start::hdf0ce3dbe0807413
   4: 0x7f699622f383 - start_thread
   5: 0x7f69962b200c - __clone3
   6:        0x0 - <unresolved>'''

[DianaOlympos]

For the time being, I created my own directory in per-user with my {user} and chowned it to my user. This seems to solve it for now, but it is definitely not elegant :smile:

[nyarly]

I'm actively working on fixing this issue in particular. It appears to be a change made in the Nix installer at some point, and I'm figuring out how best to approach gcroots now.

[nyarly]

For the time being, @DianaOlympos has the right idea: create the per-user/$user directory manually. We'll have a real fix out soon.

[ashebanow]

For the time being, @DianaOlympos has the right idea: create the per-user/$user directory manually. We'll have a real fix out soon.

Oh sure, give Diana all the credit, even though I said the same thing in this thread four months earlier ;-)

In all seriousness, though, really happy to hear a fix is in the works. Thanks!

[nyarly]

c.f. https://github.com/nix-community/lorri/issues/119#issuecomment-2195297067