Too many open files

[augustocdias]

I've decided to ask first before posting as a bug as I might be doing something wrong.

I'm having this error:

2024-02-08T11:17:06 Error  ERROR Error executing vim.schedule lua callback: ...ovim/HEAD-cc197d0/share/nvim/runtime/lua/vim/_system.lua:241: EMFILE: too many open files
stack traceback:
	[C]: in function 'error'
	...ovim/HEAD-cc197d0/share/nvim/runtime/lua/vim/_system.lua:241: in function 'spawn'
	...ovim/HEAD-cc197d0/share/nvim/runtime/lua/vim/_system.lua:332: in function 'system'
	...al/share/nvim/lazy/rustaceanvim/lua/rustaceanvim/dap.lua:57: in function 'get_rustc_commit_hash'
	...al/share/nvim/lazy/rustaceanvim/lua/rustaceanvim/dap.lua:118: in function 'generate_source_map'
	...al/share/nvim/lazy/rustaceanvim/lua/rustaceanvim/dap.lua:222: in function 'handle_configured_options'
	...al/share/nvim/lazy/rustaceanvim/lua/rustaceanvim/dap.lua:258: in function 'start'
	...y/rustaceanvim/lua/rustaceanvim/commands/debuggables.lua:119: in function 'callback'
	...y/rustaceanvim/lua/rustaceanvim/commands/debuggables.lua:138: in function 'handler'
	...r/neovim/HEAD-cc197d0/share/nvim/runtime/lua/vim/lsp.lua:1192: in function ''
	vim/_editor.lua: in function <vim/_editor.lua:0>
2024-02-08T11:20:37 Error  ERROR Error executing vim.schedule lua callback: ...ovim/HEAD-cc197d0/share/nvim/runtime/lua/vim/_system.lua:241: EMFILE: too many open files
stack traceback:
	[C]: in function 'error'
	...ovim/HEAD-cc197d0/share/nvim/runtime/lua/vim/_system.lua:241: in function 'spawn'
	...ovim/HEAD-cc197d0/share/nvim/runtime/lua/vim/_system.lua:332: in function 'system'
	...al/share/nvim/lazy/rustaceanvim/lua/rustaceanvim/dap.lua:265: in function 'start'
	...y/rustaceanvim/lua/rustaceanvim/commands/debuggables.lua:119: in function 'callback'
	...y/rustaceanvim/lua/rustaceanvim/commands/debuggables.lua:138: in function 'handler'
	...r/neovim/HEAD-cc197d0/share/nvim/runtime/lua/vim/lsp.lua:1192: in function ''
	vim/_editor.lua: in function <vim/_editor.lua:0>

When it happened I had only 3 buffers with rust files and only 2 visible in splits.

Checkhealth reports everything is fine. This is the project I'm opening: https://github.com/wireapp/core-crypto

Here's my config:

{
            tools = {
                reload_workspace_from_cargo_toml = true,
            },
            server = {
                on_attach = function(client, bufnr)
    if client.server_capabilities.documentSymbolProvider then
        require('nvim-navic').attach(client, bufnr)
    end

    require('setup.autocommand').lsp_autocmds(client, bufnr)

    -- enable inlay hints if server supports it
    if client.server_capabilities.inlayHintProvider then
        vim.lsp.inlay_hint.enable(bufnr, true)
    end
end,
                capabilities = function()
    local capabilities = vim.lsp.protocol.make_client_capabilities()
    capabilities.textDocument.completion.completionItem.snippetSupport = true
    capabilities = require('cmp_nvim_lsp').default_capabilities(capabilities)

    -- workaround until neovim supports multiple client encodings
    capabilities = vim.tbl_deep_extend('force', capabilities, {
        offsetEncoding = { 'utf-16' },
        general = {
            positionEncodings = { 'utf-16' },
        },
    })
    return capabilities
end,
                standalone = false,
                settings = {
                    ['rust-analyzer'] = {
                        diagnostics = {
                            enable = true,
                            enableExperimental = true,
                        },
                        completion = {
                            autoself = { enable = true },
                            autoimport = { enable = true },
                            postfix = { enable = true },
                        },
                        imports = {
                            group = { enable = true },
                            merge = { glob = false },
                            prefix = 'self',
                            granularity = {
                                enforce = true,
                                group = 'crate',
                            },
                        },
                        cargo = {
                            loadOutDirsFromCheck = true,
                            autoreload = true,
                            runBuildScripts = true,
                            features = 'all',
                            -- https://github.com/rust-lang/rust-analyzer/issues/13400
                            target = 'aarch64-apple-darwin',
                        },
                        procMacro = {
                            enable = true,
                            attributes = { enable = true },
                        },
                        lens = {
                            enable = true,
                            run = { enable = true },
                            debug = { enable = true },
                            implementations = { enable = true },
                            references = {
                                adt = { enable = true },
                                enumVariant = { enable = true },
                                method = { enable = true },
                                trait = { enable = true },
                            },
                        },
                        hover = {
                            actions = {
                                enable = true,
                                run = { enable = true },
                                debug = { enable = true },
                                gotoTypeDef = { enable = true },
                                implementations = { enable = true },
                                references = { enable = true },
                            },
                            links = { enable = true },
                            documentation = { enable = true },
                        },
                        inlayHints = {
                            enable = true,
                            bindingModeHints = { enable = true },
                            chainingHints = { enable = true },
                            closingBraceHints = {
                                enable = true,
                                minLines = 0,
                            },
                            closureReturnTypeHints = { enable = 'always' },
                            lifetimeElisionHints = { enable = 'skip_trivial' },
                            typeHints = { enable = true },
                            implicitDrops = { enable = true },
                        },
                        checkOnSave = {
                            enable = true,
                            -- https://github.com/rust-analyzer/rust-analyzer/issues/9768
                            command = 'clippy',
                            features = 'all',
                            allTargets = true,
                        },
                    },
                },
            },
        }

My full config: https://github.com/augustocdias/dotfiles/tree/main/.config/nvim

[mrcjkb]

Hey 👋

The stack trace tells me it's happening when rustaceanvim calls rustc --version --verbose, in order to get the rustc commit hash (to generate a source map for rustc).

Not sure why that is throwing EMFILE: too many open files, though. Seems like a MacOS issue?
This proposes to use ulimit in your shell's profile.

Or, you can workaround it by disabling source map genertion with the vim.g.rustaceanvim.dap.auto_generate_source_map option (the source map lets you step into standard library functions while debugging).

[augustocdias]

This will affect only debugging? If so I'm fine disabling it

[mrcjkb]

Yes, it only affects debugging.