internal server error - dmypy daemon crashed

[arthurbrenno]

Bug Report

./src/intellibricks/models/supervised/engines.py: error: INTERNAL ERROR -- Please try using mypy master on GitHub:
https://mypy.readthedocs.io/en/stable/common_issues.html#using-a-development-mypy-build
Please report a bug at https://github.com/python/mypy/issues
version: 1.14.1
Daemon crashed!
Traceback (most recent call last):
File "mypy/dmypy_server.py", line 236, in serve
File "mypy/dmypy_server.py", line 285, in run_command
File "mypy/dmypy_server.py", line 353, in cmd_run
File "mypy/dmypy_server.py", line 432, in check
File "mypy/dmypy_server.py", line 700, in fine_grained_increment_follow_imports
File "mypy/server/update.py", line 285, in update
File "mypy/server/update.py", line 881, in propagate_changes_using_dependencies
File "mypy/server/update.py", line 1010, in reprocess_nodes
File "mypy/semanal_main.py", line 137, in semantic_analysis_for_targets
File "mypy/semanal_main.py", line 220, in process_top_levels
File "mypy/semanal_main.py", line 351, in semantic_analyze_target
File "mypy/semanal.py", line 646, in refresh_partial
File "mypy/semanal.py", line 657, in refresh_top_level
File "mypy/semanal.py", line 7288, in accept
File "mypy/errors.py", line 1288, in report_internal_error
File "mypy/semanal.py", line 7286, in accept
File "mypy/nodes.py", line 471, in accept
File "mypy/semanal.py", line 2958, in visit_import_from
File "mypy/semanal.py", line 3054, in report_missing_module_attribute
File "mypy/semanal.py", line 7267, in fail
File "mypy/errors.py", line 463, in report
File "mypy/errors.py", line 529, in add_error_info
File "mypy/errors.py", line 466, in _add_error_info
AssertionError

[35] Error running mypy in /Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks: the mypy daemon crashed. This is probably a bug in mypy itself, see Output panel for details. The daemon will be restarted automatically.

To Reproduce

uv python install 3.13.1
uv python pin 3.13.1
uv venv
source .venv/bin/activate
uv add mypy --dev
dmypy start

x: str = 2
y: int = "3"
# ERROR

Your Environment

• Mypy version used: 1.14.1
• Mypy command-line flags: uv run dmypy start
• Mypy configuration options from mypy.ini (and other config files):
• Python version used: 3.13.1

[A5rocks]

Are you sure that's the right file? The traceback says that it crashed visiting an import from: File "mypy/semanal.py", line 2958, in visit_import_from.

[hauntsaninja]

Yeah, the traceback suggests ./src/intellibricks/models/supervised/engines.py

[arthurbrenno]

Hi. supervised/engines.py does not exist anymore. I deleted it. Maybe I clear mypy cache?

[arthurbrenno]

Are you sure that's the right file? The traceback says that it crashed visiting an import from: File "mypy/semanal.py", line 2958, in visit_import_from.

I'm sure! Also, I'm using the mypy extension, from Matan Gover. That might not be your problem, right? I should tell the extension author. The error I told you happens automatically. I didn't run any mypy command. The extension is running mypy daemon in the background. I tested now in a file called schema.py.

Just replicated the error again now:
Document saved: /Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/src/intellibricks/llms/schema.py
[62] Check folder: /Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks
[62] Received Python path from Python extension: /Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/bin/python
[62] Running dmypy in folder /Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks
/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/bin/dmypy --status-file '/Users/arthurbrenno/Library/Application Support/Code/User/workspaceStorage/8a9c88162dc1465d3ab80eb67813bccb/matangover.mypy/dmypy-8472a25bb76665ac15378ffb435fc2ea45288337-1975.json' run --log-file '/Users/arthurbrenno/Library/Application Support/Code/User/workspaceStorage/8a9c88162dc1465d3ab80eb67813bccb/matangover.mypy/dmypy-8472a25bb76665ac15378ffb435fc2ea45288337.log' -- --python-executable /Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/bin/python . --show-error-end --no-error-summary --no-pretty --no-color-output
[62] stderr:
Daemon crashed!
Traceback (most recent call last):
File "mypy/dmypy_server.py", line 236, in serve
File "mypy/dmypy_server.py", line 285, in run_command
File "mypy/dmypy_server.py", line 353, in cmd_run
File "mypy/dmypy_server.py", line 432, in check
File "mypy/dmypy_server.py", line 700, in fine_grained_increment_follow_imports
File "mypy/server/update.py", line 285, in update
File "mypy/server/update.py", line 881, in propagate_changes_using_dependencies
File "mypy/server/update.py", line 1025, in reprocess_nodes
File "mypy/checker.py", line 535, in check_second_pass
File "mypy/checker.py", line 540, in check_partial
File "mypy/checker.py", line 555, in check_top_level
File "mypy/nodes.py", line 1364, in accept
File "mypy/checker.py", line 3001, in visit_assignment_stmt
File "mypy/checker.py", line 3179, in check_assignment
File "mypy/checker.py", line 4379, in check_simple_assignment
File "mypy/checker.py", line 7007, in check_subtype
File "mypy/checker.py", line 7350, in fail
File "mypy/messages.py", line 289, in fail
File "mypy/messages.py", line 264, in report
File "mypy/errors.py", line 463, in report
File "mypy/errors.py", line 529, in add_error_info
File "mypy/errors.py", line 466, in _add_error_info
AssertionError

[62] Error running mypy in /Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks: the mypy daemon crashed. This is probably a bug in mypy itself, see Output panel for details. The daemon will be restarted automatically.

Idk where to look honestly

[A5rocks]

The traceback is different now (and is plausible on the repro you gave), so that's good! I'm not sure why it's happening since I'm not familiar with mypyd :/

[miky-rola]

Hi, I wanted to know whether this bug has been fixed.

[A5rocks]

It is unlikely this bug has been fixed. You can always install mypy via pip install git+https://github.com/python/mypy to check.

[arthurbrenno]

Just reproduced the error again, more details below:

Daemon crashed!
Traceback (most recent call last):
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/dmypy_server.py", line 237, in serve
    resp = self.run_command(command, data)
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/dmypy_server.py", line 286, in run_command
    ret = method(self, **data)
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/dmypy_server.py", line 354, in cmd_run
    return self.check(sources, export_types, is_tty, terminal_width)
           ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/dmypy_server.py", line 433, in check
    messages = self.fine_grained_increment_follow_imports(
        sources, explicit_export_types=export_types
    )
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/dmypy_server.py", line 701, in fine_grained_increment_follow_imports
    messages = fine_grained_manager.update([], to_delete)
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/server/update.py", line 286, in update
    changed_modules = propagate_changes_using_dependencies(
        self.manager,
    ...<5 lines>...
        self.processed_targets,
    )
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/server/update.py", line 882, in propagate_changes_using_dependencies
    triggered |= reprocess_nodes(manager, graph, id, nodes, deps, processed_targets)
                 ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/server/update.py", line 1011, in reprocess_nodes
    semantic_analysis_for_targets(graph[module_id], nodes, graph, saved_attrs)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/semanal_main.py", line 137, in semantic_analysis_for_targets
    process_top_levels(graph, [state.id], patches)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/semanal_main.py", line 220, in process_top_levels
    deferred, incomplete, progress = semantic_analyze_target(
                                     ~~~~~~~~~~~~~~~~~~~~~~~^
        next_id, next_id, state, state.tree, None, final_iteration, patches
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/semanal_main.py", line 351, in semantic_analyze_target
    analyzer.refresh_partial(
    ~~~~~~~~~~~~~~~~~~~~~~~~^
        refresh_node,
        ^^^^^^^^^^^^^
    ...<4 lines>...
        active_type=active_type,
        ^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/semanal.py", line 647, in refresh_partial
    self.refresh_top_level(node)
    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/semanal.py", line 658, in refresh_top_level
    self.accept(d)
    ~~~~~~~~~~~^^^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/semanal.py", line 7303, in accept
    report_internal_error(err, self.errors.file, node.line, self.errors, self.options)
    ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/errors.py", line 1289, in report_internal_error
    raise err
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/semanal.py", line 7301, in accept
    node.accept(self)
    ~~~~~~~~~~~^^^^^^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/nodes.py", line 1183, in accept
    return visitor.visit_class_def(self)
           ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/semanal.py", line 1788, in visit_class_def
    self.analyze_class(defn)
    ~~~~~~~~~~~~~~~~~~^^^^^^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/semanal.py", line 1929, in analyze_class
    bases, tvar_defs, is_protocol = self.clean_up_bases_and_infer_type_variables(
                                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        defn, bases, context=defn
        ^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/semanal.py", line 2240, in clean_up_bases_and_infer_type_variables
    self.analyze_type_expr(base_expr)
    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/semanal.py", line 7355, in analyze_type_expr
    expr.accept(self)
    ~~~~~~~~~~~^^^^^^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/nodes.py", line 1895, in accept
    return visitor.visit_member_expr(self)
           ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/semanal.py", line 5906, in visit_member_expr
    base.accept(self)
    ~~~~~~~~~~~^^^^^^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/nodes.py", line 1873, in accept
    return visitor.visit_name_expr(self)
           ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/semanal.py", line 5651, in visit_name_expr
    n = self.lookup(expr.name, expr)
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/semanal.py", line 6345, in lookup
    self.name_not_defined(name, ctx)
    ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/semanal.py", line 7176, in name_not_defined
    self.fail(message, ctx, code=codes.NAME_DEFINED)
    ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/semanal.py", line 7282, in fail
    self.errors.report(ctx.line, ctx.column, msg, blocker=blocker, code=code)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/errors.py", line 464, in report
    self.add_error_info(info)
    ~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/errors.py", line 530, in add_error_info
    self._add_error_info(file, info)
    ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks/.venv/lib/python3.13/site-packages/mypy/errors.py", line 467, in _add_error_info
    assert file not in self.flushed_files
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError


[34] Error running mypy in /Users/arthurbrenno/Documents/Dev/Public/ctx/intellibricks: the mypy daemon crashed. This is probably a bug in mypy itself, see Output panel for details. The daemon will be restarted automatically.