Breakpoint is not hit (neotest, neotest-golang, nio, async)

[ruslanSorokin]

I've read the disclaimer about fs paths and double-checked that the filepath is correct and none of the directories in the path are symlinked. I've also confirmed via both tracing and vim.print that the line is being executed.

I've tried to run the code triggering the line require("neotest").run.run() wrapped in require("nio").run(require("neotest").run.run().wait) but it didn't seem to help.

This is the clean log file where I successfully hit the breakpoint:

{
  arguments = {
    adapterID = "nvim-dap",
    clientID = "neovim",
    clientName = "neovim",
    columnsStartAt1 = true,
    linesStartAt1 = true,
    locale = "C.UTF-8",
    pathFormat = "path",
    supportsProgressReporting = true,
    supportsRunInTerminalRequest = true,
    supportsStartDebuggingRequest = true,
    supportsVariableType = true
  },
  command = "initialize",
  seq = 1,
  type = "request"
}
{
  body = {
    supportTerminateDebuggee = true,
    supportsConditionalBreakpoints = true,
    supportsConfigurationDoneRequest = true,
    supportsExceptionInfoRequest = true,
    supportsHitConditionalBreakpoints = true,
    supportsSetVariable = true
  },
  command = "initialize",
  request_seq = 1,
  seq = 1,
  success = true,
  type = "response"
}
{
  event = "initialized",
  seq = 2,
  type = "event"
}
{
  arguments = {
    breakpoints = { {
        line = 8
      } },
    lines = { 8 },
    source = {
      name = "trim_newlines.lua",
      path = "/home/ruslan/.local/share/nvim/lazy/conform.nvim/lua/conform/formatters/trim_newlines.lua"
    },
    sourceModified = false
  },
  command = "setBreakpoints",
  seq = 3,
  type = "request"
}
{
  body = {
    breakpoints = { {
        verified = true
      } }
  },
  command = "setBreakpoints",
  request_seq = 3,
  seq = 1,
  success = true,
  type = "response"
}
{
  command = "configurationDone",
  seq = 4,
  type = "request"
}
{
  arguments = {
    name = "Attach to running Neovim instance (port = 8086)",
    port = 8086,
    request = "attach",
    type = "nlua"
  },
  command = "attach",
  seq = 2,
  type = "request"
}
{
  command = "configurationDone",
  request_seq = 4,
  seq = 2,
  success = true,
  type = "response"
}
{
  command = "attach",
  request_seq = 2,
  seq = 3,
  success = true,
  type = "response"
}
true
breakpoint hit
{
  body = {
    reason = "breakpoint",
    threadId = 1
  },
  event = "stopped",
  seq = 4,
  type = "event"
}
{
  command = "threads",
  seq = 5,
  type = "request"
}
{
  body = {
    threads = { {
        id = 1,
        name = "main"
      } }
  },
  command = "threads",
  request_seq = 5,
  seq = 5,
  success = true,
  type = "response"
}
{
  arguments = {
    startFrame = 0,
    threadId = 1
  },
  command = "stackTrace",
  seq = 6,
  type = "request"
}
{
  body = {
    stackFrames = { {
        column = 0,
        id = 1,
        line = 8,
        name = "Lua",
        source = {
          name = "@/home/ruslan/.local/share/nvim/lazy/conform.nvim/lua/conform/formatters/trim_newlines.lua",
          path = "/home/ruslan/.local/share/nvim/lazy/conform.nvim/lua/conform/formatters/trim_newlines.lua"
        }
      }, {
        column = 0,
        id = 2,
        line = 0,
        name = "pcall"
      }, {
        column = 0,
        id = 3,
        line = 341,
        name = "run_formatter",
        source = {
          name = "@/home/ruslan/.local/share/nvim/lazy/conform.nvim/lua/conform/runner.lua",
          path = "/home/ruslan/.local/share/nvim/lazy/conform.nvim/lua/conform/runner.lua"
        }
      }, {
        column = 0,
        id = 4,
        line = 677,
        name = "format_lines_sync",
        source = {
          name = "@/home/ruslan/.local/share/nvim/lazy/conform.nvim/lua/conform/runner.lua",
          path = "/home/ruslan/.local/share/nvim/lazy/conform.nvim/lua/conform/runner.lua"
        }
      }, {
        column = 0,
        id = 5,
        line = 632,
        name = "format_sync",
        source = {
          name = "@/home/ruslan/.local/share/nvim/lazy/conform.nvim/lua/conform/runner.lua",
          path = "/home/ruslan/.local/share/nvim/lazy/conform.nvim/lua/conform/runner.lua"
        }
      }, {
        column = 0,
        id = 6,
        line = 519,
        name = "run_cli_formatters",
        source = {
          name = "@/home/ruslan/.local/share/nvim/lazy/conform.nvim/lua/conform/init.lua",
          path = "/home/ruslan/.local/share/nvim/lazy/conform.nvim/lua/conform/init.lua"
        }
      }, {
        column = 0,
        id = 7,
        line = 548,
        name = "format",
        source = {
          name = "@/home/ruslan/.local/share/nvim/lazy/conform.nvim/lua/conform/init.lua",
          path = "/home/ruslan/.local/share/nvim/lazy/conform.nvim/lua/conform/init.lua"
        }
      }, {
        column = 0,
        id = 8,
        line = 44,
        name = "Lua",
        source = {
          name = "@/home/ruslan/.local/share/nvim/lazy/LazyVim/lua/lazyvim/plugins/formatting.lua",
          path = "/home/ruslan/.local/share/nvim/lazy/LazyVim/lua/lazyvim/plugins/formatting.lua"
        }
      }, {
        column = 0,
        id = 9,
        line = 0,
        name = "xpcall"
      }, {
        column = 0,
        id = 10,
        line = 135,
        name = "try",
        source = {
          name = "@/home/ruslan/.local/share/nvim/lazy/lazy.nvim/lua/lazy/core/util.lua",
          path = "/home/ruslan/.local/share/nvim/lazy/lazy.nvim/lua/lazy/core/util.lua"
        }
      }, {
        column = 0,
        id = 11,
        line = 130,
        name = "format",
        source = {
          name = "@/home/ruslan/.local/share/nvim/lazy/LazyVim/lua/lazyvim/util/format.lua",
          path = "/home/ruslan/.local/share/nvim/lazy/LazyVim/lua/lazyvim/util/format.lua"
        }
      }, {
        column = 0,
        id = 12,
        line = 118,
        name = "Lua",
        source = {
          name = "@/home/ruslan/.local/share/nvim/lazy/LazyVim/lua/lazyvim/config/keymaps.lua",
          path = "/home/ruslan/.local/share/nvim/lazy/LazyVim/lua/lazyvim/config/keymaps.lua"
        }
      } },
    totalFrames = 12
  },
  command = "stackTrace",
  request_seq = 6,
  seq = 6,
  success = true,
  type = "response"
}
{
  arguments = {
    frameId = 1
  },
  command = "scopes",
  seq = 7,
  type = "request"
}
{
  body = {
    scopes = { {
        expensive = false,
        name = "Locals",
        presentationHint = "locals",
        variablesReference = 1
      } }
  },
  command = "scopes",
  request_seq = 7,
  seq = 7,
  success = true,
  type = "response"
}
{
  arguments = {
    variablesReference = 1
  },
  command = "variables",
  seq = 8,
  type = "request"
}
2
{
  body = {
    variables = { {
        name = "self",
        value = "table: 0x7d509509ab80",
        variablesReference = 2
      }, {
        name = "ctx",
        value = "table: 0x7d5099728138",
        variablesReference = 3
      }, {
        name = "lines",
        value = "table: 0x7d50990569a8",
        variablesReference = 4
      }, {
        name = "callback",
        value = "function: 0x7d509528dc78",
        variablesReference = 0
      } }
  },
  command = "variables",
  request_seq = 8,
  seq = 8,
  success = true,
  type = "response"
}
{
  arguments = {
    variablesReference = 1
  },
  command = "variables",
  seq = 9,
  type = "request"
}
2
{
  body = {
    variables = { {
        name = "self",
        value = "table: 0x7d509509ab80",
        variablesReference = 5
      }, {
        name = "ctx",
        value = "table: 0x7d5099728138",
        variablesReference = 6
      }, {
        name = "lines",
        value = "table: 0x7d50990569a8",
        variablesReference = 7
      }, {
        name = "callback",
        value = "function: 0x7d509528dc78",
        variablesReference = 0
      } }
  },
  command = "variables",
  request_seq = 9,
  seq = 9,
  success = true,
  type = "response"
}
{
  arguments = {
    restart = false,
    terminateDebuggee = true
  },
  command = "disconnect",
  seq = 10,
  type = "request"
}
SERVER TERMINATED
{
  command = "disconnect",
  request_seq = 10,
  seq = 10,
  success = true,
  type = "response"
}

And this is the log where the breakpoint isn’t hit:
(PS: I think I forgot to wait until I had closed Neovim, so there is no ‘SERVER TERMINATED’ log entry. Just in case somebody assumes that Neovim is frozen and I had to kill the process and that is why there is no 'SERVER TERMINATED' - this is not true; code is still being executed like no debugger is attached)

{
  arguments = {
    adapterID = "nvim-dap",
    clientID = "neovim",
    clientName = "neovim",
    columnsStartAt1 = true,
    linesStartAt1 = true,
    locale = "C.UTF-8",
    pathFormat = "path",
    supportsProgressReporting = true,
    supportsRunInTerminalRequest = true,
    supportsStartDebuggingRequest = true,
    supportsVariableType = true
  },
  command = "initialize",
  seq = 1,
  type = "request"
}
{
  body = {
    supportTerminateDebuggee = true,
    supportsConditionalBreakpoints = true,
    supportsConfigurationDoneRequest = true,
    supportsExceptionInfoRequest = true,
    supportsHitConditionalBreakpoints = true,
    supportsSetVariable = true
  },
  command = "initialize",
  request_seq = 1,
  seq = 1,
  success = true,
  type = "response"
}
{
  event = "initialized",
  seq = 2,
  type = "event"
}
{
  arguments = {
    breakpoints = { {
        line = 107
      } },
    lines = { 107 },
    source = {
      name = "diagnostics.lua",
      path = "/home/ruslan/.local/share/nvim/lazy/neotest-golang/lua/neotest-golang/lib/diagnostics.lua"
    },
    sourceModified = false
  },
  command = "setBreakpoints",
  seq = 3,
  type = "request"
}
{
  body = {
    breakpoints = { {
        verified = true
      } }
  },
  command = "setBreakpoints",
  request_seq = 3,
  seq = 1,
  success = true,
  type = "response"
}
{
  command = "configurationDone",
  seq = 4,
  type = "request"
}
{
  arguments = {
    name = "Attach to running Neovim instance (port = 8086)",
    port = 8086,
    request = "attach",
    type = "nlua"
  },
  command = "attach",
  seq = 2,
  type = "request"
}
{
  command = "configurationDone",
  request_seq = 4,
  seq = 2,
  success = true,
  type = "response"
}
{
  command = "attach",
  request_seq = 2,
  seq = 3,
  success = true,
  type = "response"
}

[jbyuki]

Is it possible that the breakpoint is placed in a "fast" event callback :h api-fast ?

This can be checked by calling vim.in_fast_event().

And another question, I see that the breakpoint is placed on different lines ( in the case where it hits and where it doesn't ). Is it a random behaviour or does it depend on the line where you put the breakpoint ?

[jbyuki]

Thanks, for the detailed logs althought to be honest it's a bit tricky to figure out the issues without any reproduction. A repro and an ticket in the issue tracker would help me a lot.

Anyway, i've probably figured out the problem. The main issue being that nio is using debug.traceback explicitly (in tasks.lua according to the log). Why it doesn't hit is probably not really relevant here. I will try to push a fix shortly so you could test it.

[jbyuki]

@ruslanSorokin
Please try the branched version in #85 and let me know if it fixes anything.

[ruslanSorokin]

@ruslanSorokin

Please try the branched version in #85 and let me know if it fixes anything.

Unfortunately, it still doesn't work

[ruslanSorokin]

I guess I’ll transfer this into an issue with some kind of repro.lua

[jbyuki]

Yes please