mypy crashes with "Cannot find component" on subsequent runs

Crash Report

Running mypy after the first run sometimes crashes.

rm -rf .mypy_cache fixes the issue, but if I then run mypy a few more times, it crashes again.

Traceback

$ mypy
Traceback (most recent call last):
File "/path/to/mypy/mypy", line 8, in <module> sys.exit(console_entry())
File "/path/to/mypy/_-main_-.py",line 15, in console_entry main(
File "mypy/main.py", line 119, in main
File "mypy/main.py"
File "mypy/build.py"
, line 203, in run_build , line 191, in build
File "mypy/build.py", line 267, in _build File "mypy/build.py", line 2937, in dispatch
File "mypy/build.py" , line 3328, in process-graph
File "mypy/build.py",
File '
"mypy/build.py"
line 3409, in process_fresh-modules , line 2107, in fix_cross_refs
File "mypy/fixup.py" , line 52, in fixup-module
File
"mypy/fixup.py" , line 128, in visit_symbol_table
File "mypy/lookup.py", line 49, in lookup_fully_qualified
AssertionError: Cannot find component 'operators' for 'sqlalchemy.sql.operators'

To Reproduce

This is at work, and it's a rather large repo, so I can't provide easy repro steps. I would be happy to provide additional information that you need.

Your Environment

• Mypy version used: v1.15.0
• Mypy command-line flags:
• Mypy configuration options from mypy.ini (and other config files):

[mypy]
mypy_path = server/python_stubs,server

files = server/,test/

explicit_package_bases = True
enable_incomplete_feature=InlineTypedDict

strict = True
warn_return_any = False
disallow_untyped_calls = False
no_implicit_reexport = False
warn_unreachable = True
plugins = pydantic.mypy

Additionally, we added ignore_missing_imports to most of our libraries.

• Python version used:
• python 3.11.11
• Operating system and version:
• macOS ventura

从经过 mypy/build.py、mypy/fixup.py 和 mypy/lookup.py 的 traceback 路径开始，重点关注重新使用 .mypy_cache 后对新模块的处理。如果可能，在后续运行中重现该故障，然后验证重复运行 mypy 不再引发报告中的 AssertionError。