Error detected while processing function PollSignatureHelp with python-lsp-server and numpy

[amosnier]

@puremourning was able to reproduce, here comes his text:

python3 -m venv .env
source .env/bin/activate
pip install numpy python-lsp-server
cp ~/.vim/bundle/YouCompleteMe/vimrc_ycm_minimal .
vi vimrc_ycm_minimal

" windows default encoding is not supported
set encoding=utf-8

" If you using neovim and python isn't loading, copy your python setup from your
" vimrc here:
"
" let g:python3_host_prog = '/path/to/python3/with/neovim/module'
"
" But remember that neovim is not officially supported, so please reproduce in
" Vim.

" Enable debugging
let g:ycm_keep_logfiles = 1
let g:ycm_log_level = 'debug'

" If the base settings don't repro, paste your existing config for YCM only,
" here:
" let g:ycm_....

let g:ycm_language_server = [
        \   {
        \     'name': 'pylsp',
        \     'cmdline': [ 'pylsp' ],
        \     'filetypes': [ 'python' ],
        \   },
        \ ]

" Load YCM (only)
let &rtp .= ',/Users/ben/.vim/bundle/YouCompleteMe'
filetype plugin indent on
syn on


vim -Nu vimrc_ycm_minimal test.py

write:

import numpy as np
np.isnan(

When doing that, I am myself getting:

Messages maintainer: The Vim Project
"test.py" 3L, 28B
Error detected while processing function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp[5]..function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp:
line    5:
Traceback (most recent call last):
Error detected while processing function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp[5]..function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp:
line    5:
  File "<string>", line 1, in <module>
Error detected while processing function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp[5]..function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp:
line    5:
  File ".vim/plugged/YouCompleteMe/python/ycm/youcompleteme.py", line 425, in UpdateSignatureHelp
Error detected while processing function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp[5]..function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp:
line    5:
    self._signature_help_state = signature_help.UpdateSignatureHelp(
Error detected while processing function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp[5]..function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp:
line    5:
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error detected while processing function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp[5]..function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp:
line    5:
  File ".vim/plugged/YouCompleteMe/python/ycm/signature_help.py", line 190, in UpdateSignatureHelp
Error detected while processing function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp[5]..function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp:
line    5:
    state.popup_win_id = GetIntValue(
Error detected while processing function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp[5]..function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp:
line    5:
                         ^^^^^^^^^^^^
Error detected while processing function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp[5]..function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp:
line    5:
  File ".vim/plugged/YouCompleteMe/python/ycm/vimsupport.py", line 927, in GetIntValue
Error detected while processing function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp[5]..function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp:
line    5:
    return int( vim.eval( variable ) or 0 )
Error detected while processing function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp[5]..function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp:
line    5:
                ^^^^^^^^^^^^^^^^^^^^
Error detected while processing function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp[5]..function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp:
line    5:
vim.error: Vim:E475: Invalid value for argument length
Error detected while processing function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp[5]..function <SNR>87_PollSignatureHelp[19]..<SNR>87_UpdateSignatureHelp:
line    5:
E858: Eval did not return a valid python object

1 change; before #5  15 seconds ago
"messages.txt" [New] 0L, 0B written
45 more lines
"messages.txt" 46L, 3383B written
"messages.txt" 44L, 3381B written
1 more line; before #3  17 seconds ago
1 more line; before #2  19 seconds ago
46 fewer lines; before #1  29 seconds ago
"messages.txt" 0L, 0B written

Printing YouCompleteMe debug information...
-- Resolve completions: Up front
-- Client logfile: /tmp/ycm_jc35oi8_.log
-- Server Python interpreter: /usr/bin/python3
-- Server Python version: 3.12.3
-- Server has Clang support compiled in: True
-- Clang version: clang version 19.1.0 (https://github.com/ycm-core/llvm 6355059428ba8b509409c352f953b0602d29595c)
-- No extra configuration file found
-- GenericLSP completer debug information:
--   pylspCompleter running
--   pylspCompleter process ID: 18403
--   pylspCompleter executable: ['/tmp/test/venv/bin/pylsp']
--   pylspCompleter logfiles:
--     /tmp/pylspcompleter_stderrlt7onuub.log
--   pylspCompleter Server State: Initialized
--   pylspCompleter Project Directory: /tmp/test
--   pylspCompleter Open Workspaces: {'/tmp/test'}
--   pylspCompleter Settings: {}
-- Server running at: http://127.0.0.1:51803
-- Server process ID: 18384
-- Server logfiles:
--   /tmp/ycmd_51803_stdout_d1lyimlr.log
--   /tmp/ycmd_51803_stderr_dtqjxv0h.log
-- Semantic highlighting supported: True
-- Virtual text supported: True
-- Popup windows supported: True
``

[puremourning]

The following message is received from the LSP server:

ben@BenMBP2021 ~ % cat j | jq
{
  "jsonrpc": "2.0",
  "id": 131,
  "result": {
    "signatures": [
      {
        "label": "ufunc()",
        "documentation": {
          "kind": "plaintext",
          "value": "isnan(x, \\/, out=None, *, where=True, casting='same_kind', order='K', dtype=None, subok=True[, signature])\\n\\nTest element-wise for NaN and return result as a boolean array.\\n\\nParameters\\n----------\\nx : array_like\\n\\u00a0\\u00a0\\u00a0\\u00a0Input array.\\nout : ndarray, None, or tuple of ndarray and None, optional\\n\\u00a0\\u00a0\\u00a0\\u00a0A location into which the result is stored. If provided, it must have\\n\\u00a0\\u00a0\\u00a0\\u00a0a shape that the inputs broadcast to. If not provided or None,\\n\\u00a0\\u00a0\\u00a0\\u00a0a freshly-allocated array is returned. A tuple (possible only as a\\n\\u00a0\\u00a0\\u00a0\\u00a0keyword argument) must have length equal to the number of outputs.\\nwhere : array_like, optional\\n\\u00a0\\u00a0\\u00a0\\u00a0This condition is broadcast over the input. At locations where the\\n\\u00a0\\u00a0\\u00a0\\u00a0condition is True, the `out` array will be set to the ufunc result.\\n\\u00a0\\u00a0\\u00a0\\u00a0Elsewhere, the `out` array will retain its original value.\\n\\u00a0\\u00a0\\u00a0\\u00a0Note that if an uninitialized `out` array is created via the default\\n\\u00a0\\u00a0\\u00a0\\u00a0``out=None``, locations within it where the condition is False will\\n\\u00a0\\u00a0\\u00a0\\u00a0remain uninitialized.\\n**kwargs\\n\\u00a0\\u00a0\\u00a0\\u00a0For other keyword-only arguments, see the\\n\\u00a0\\u00a0\\u00a0\\u00a0:ref:`ufunc docs <ufuncs.kwargs>`.\\n\\nReturns\\n-------\\ny : ndarray or bool\\n\\u00a0\\u00a0\\u00a0\\u00a0True where ``x`` is NaN, false otherwise.\\n\\u00a0\\u00a0\\u00a0\\u00a0This is a scalar if `x` is a scalar.\\n\\nSee Also\\n--------\\nisinf, isneginf, isposinf, isfinite, isnat\\n\\nNotes\\n-----\\nNumPy uses the IEEE Standard for Binary Floating-Point for Arithmetic\\n(IEEE 754). This means that Not a Number is not equivalent to infinity.\\n\\nExamples\\n--------\\n>>> import numpy as np\\n>>> np.isnan(np.nan)\\nTrue\\n>>> np.isnan(np.inf)\\nFalse\\n>>> np.isnan([np.log(-1.),1.,np.log(0)])\\narray([ True, False, False])"
        },
        "parameters": [
          {
            "label": "args",
            "documentation": {
              "kind": "plaintext",
              "value": ""
            }
          },
          {
            "label": "kwargs",
            "documentation": {
              "kind": "plaintext",
              "value": ""
            }
          }
        ]
      }
    ],
    "activeSignature": 0,
    "activeParameter": 0
  }
}

this is invalid according to to the specification.

The specification states that the label of each parameter must be substring of the label of the signature.

The signature label of ufunc() is clearly incorrect and thus invalid.

Please raise this with the developer of the language server or use YCM's supported built-in Python support via Jedi. Or disable signature help of course.