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python3.14: occasional crashes with mypyc compiled code · Issue #21133 · python/mypy · GitHub

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python3.14: occasional crashes with mypyc compiled code #21133

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#21290
Closed
python3.14: occasional crashes with mypyc compiled code#21133
#21290
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bugmypy got something wrongpriority-0-hightopic-mypycmypyc bugs

Description

mr-c
opened on Apr 1, 2026

Bug Report

mypyc compiled modules sometimes segfault

Here's one log (compiled using mypy 1.20.0) 

  Fatal Python error: Segmentation fault
  
  Thread 0x00007f8e3a5ff6c0 [python] (most recent call first):
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/execnet/gateway_base.py", line 534 in read
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/execnet/gateway_base.py", line 567 in from_io
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/execnet/gateway_base.py", line 1160 in _thread_receiver
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/execnet/gateway_base.py", line 341 in run
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/execnet/gateway_base.py", line 411 in _perform_spawn
  
  Current thread 0x00007f8e3c032b80 [python] (most recent call first):
    Garbage-collecting
    File "<string>", line 2 in __init__
    File "/home/runner/work/schema_salad/schema_salad/schema_salad/tests/test_python_codegen.py", line 68 in python_codegen
    File "/home/runner/work/schema_salad/schema_salad/schema_salad/tests/test_python_codegen.py", line 36 in test_meta_schema_gen
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/_pytest/python.py", line 166 in pytest_pyfunc_call
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/pluggy/_callers.py", line 121 in _multicall
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/pluggy/_manager.py", line 120 in _hookexec
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/pluggy/_hooks.py", line 512 in __call__
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/_pytest/python.py", line 1720 in runtest
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/_pytest/runner.py", line 179 in pytest_runtest_call
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/pluggy/_callers.py", line 121 in _multicall
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/pluggy/_manager.py", line 120 in _hookexec
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/pluggy/_hooks.py", line 512 in __call__
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/_pytest/runner.py", line 245 in <lambda>
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/_pytest/runner.py", line 353 in from_call
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/_pytest/runner.py", line 244 in call_and_report
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/_pytest/runner.py", line 137 in runtestprotocol
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/_pytest/runner.py", line 118 in pytest_runtest_protocol
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/pluggy/_callers.py", line 121 in _multicall
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/pluggy/_manager.py", line 120 in _hookexec
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/pluggy/_hooks.py", line 512 in __call__
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/xdist/remote.py", line 227 in run_one_test
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/xdist/remote.py", line 206 in pytest_runtestloop
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/pluggy/_callers.py", line 121 in _multicall
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/pluggy/_manager.py", line 120 in _hookexec
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/pluggy/_hooks.py", line 512 in __call__
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/_pytest/main.py", line 372 in _main
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/_pytest/main.py", line 318 in wrap_session
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/_pytest/main.py", line 365 in pytest_cmdline_main
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/pluggy/_callers.py", line 121 in _multicall
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/pluggy/_manager.py", line 120 in _hookexec
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/pluggy/_hooks.py", line 512 in __call__
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/xdist/remote.py", line 427 in <module>
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/execnet/gateway_base.py", line 1291 in executetask
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/execnet/gateway_base.py", line 341 in run
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/execnet/gateway_base.py", line 411 in _perform_spawn
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/execnet/gateway_base.py", line 389 in integrate_as_primary_thread
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/execnet/gateway_base.py", line 1273 in serve
    File "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/execnet/gateway_base.py", line 1806 in serve
    File "<string>", line 8 in <module>
    File "<string>", line 1 in <module>
  
  Current thread's C stack trace (most recent call first):
    Binary file "/opt/hostedtoolcache/Python/3.14.3/x64/lib/libpython3.14.so.1.0", at _Py_DumpStack+0x47 [0x7f8e3bb6947e]
    Binary file "/opt/hostedtoolcache/Python/3.14.3/x64/lib/libpython3.14.so.1.0", at +0x1724d4 [0x7f8e3bb724d4]
    Binary file "/lib/x86_64-linux-gnu/libc.so.6", at +0x45330 [0x7f8e3b645330]
    Binary file "/opt/hostedtoolcache/Python/3.14.3/x64/lib/libpython3.14.so.1.0", at +0x2489ab [0x7f8e3bc489ab]
    Binary file "/opt/hostedtoolcache/Python/3.14.3/x64/lib/libpython3.14.so.1.0", at +0x1ecb19 [0x7f8e3bbecb19]
    Binary file "/opt/hostedtoolcache/Python/3.14.3/x64/lib/libpython3.14.so.1.0", at +0x2e847f [0x7f8e3bce847f]
    Binary file "/opt/hostedtoolcache/Python/3.14.3/x64/lib/libpython3.14.so.1.0", at _Py_HandlePending+0x38 [0x7f8e3bcea2f8]
    Binary file "/opt/hostedtoolcache/Python/3.14.3/x64/lib/libpython3.14.so.1.0", at _PyEval_EvalFrameDefault+0xd71b [0x7f8e3bc3785b]
    Binary file "/opt/hostedtoolcache/Python/3.14.3/x64/lib/libpython3.14.so.1.0", at +0x229112 [0x7f8e3bc29112]
    Binary file "/opt/hostedtoolcache/Python/3.14.3/x64/lib/libpython3.14.so.1.0", at +0x1c658a [0x7f8e3bbc658a]
    Binary file "/opt/hostedtoolcache/Python/3.14.3/x64/lib/libpython3.14.so.1.0", at +0x203513 [0x7f8e3bc03513]
    Binary file "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/fd7dcdb10166ebd4db98__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_pytokens___Token+0x3b [0x7f8e336275db]
    Binary file "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/fd7dcdb10166ebd4db98__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_pytokens___TokenIterator___make_token+0x478 [0x7f8e3362a248]
    Binary file "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/fd7dcdb10166ebd4db98__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_pytokens___TokenIterator_____next__+0x38cb [0x7f8e3363b0ab]
    Binary file "/opt/hostedtoolcache/Python/3.14.3/x64/lib/libpython3.14.so.1.0", at PyIter_Next+0x14 [0x7f8e3bbb9924]
    Binary file "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/30fcd23745efe32ce681__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_tokenize___tokenize_gen_____mypyc_generator_helper__+0x119f [0x7f8e334d452f]
    Binary file "/opt/hostedtoolcache/Python/3.14.3/x64/lib/libpython3.14.so.1.0", at +0x227c48 [0x7f8e3bc27c48]
    Binary file "/opt/hostedtoolcache/Python/3.14.3/x64/lib/libpython3.14.so.1.0", at PyObject_Vectorcall+0x53 [0x7f8e3bbc5743]
    Binary file "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/30fcd23745efe32ce681__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_driver___TokenProxy_____next__+0x427 [0x7f8e334954d7]
    Binary file "/opt/hostedtoolcache/Python/3.14.3/x64/lib/libpython3.14.so.1.0", at PyIter_Next+0x14 [0x7f8e3bbb9924]
    Binary file "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/30fcd23745efe32ce681__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_driver___Driver___parse_tokens+0x180b [0x7f8e334974cb]
    Binary file "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/30fcd23745efe32ce681__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_driver___Driver___parse_string+0x4e [0x7f8e333f560e]
    Binary file "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/30fcd23745efe32ce681__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_parsing___lib2to3_parse+0x534 [0x7f8e332ca524]
    Binary file "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/30fcd23745efe32ce681__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_black____format_str_once+0x212 [0x7f8e332c7152]
    Binary file "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/30fcd23745efe32ce681__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_black___format_str+0x9f [0x7f8e332c2d3f]
    Binary file "/home/runner/work/schema_salad/schema_salad/.tox/py314-mypy/lib/python3.14/site-packages/30fcd23745efe32ce681__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyPy_black___format_str+0x72 [0x7f8e332c9f92]
    Binary file "/opt/hostedtoolcache/Python/3.14.3/x64/lib/libpython3.14.so.1.0", at PyObject_Vectorcall+0x53 [0x7f8e3bbc5743]
    Binary file "/home/runner/work/schema_salad/schema_salad/5df31530eea7292b5dae__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_python_codegen___fmt+0x249 [0x7f8e382cb559]
    Binary file "/home/runner/work/schema_salad/schema_salad/5df31530eea7292b5dae__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_python_codegen___PythonCodeGen___end_class+0x443 [0x7f8e382ed253]
    Binary file "/home/runner/work/schema_salad/schema_salad/5df31530eea7292b5dae__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_codegen___codegen+0xc43c [0x7f8e383abd8c]
    Binary file "/home/runner/work/schema_salad/schema_salad/5df31530eea7292b5dae__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyPy_codegen___codegen+0x2aa [0x7f8e383ae95a]
    Binary file "/opt/hostedtoolcache/Python/3.14.3/x64/lib/libpython3.14.so.1.0", at PyObject_Vectorcall+0x53 [0x7f8e3bbc5743]
    <truncated rest of calls>
  
  Extension modules: schema_salad, schema_salad.utils, charset_normalizer.md, charset_normalizer.cd, requests.packages.charset_normalizer.md, requests.packages.chardet.md, requests.packages.charset_normalizer.cd, requests.packages.chardet.cd, schema_salad.jsonld_context, schema_salad.sourceline, schema_salad.ref_resolver, msgpack._cmsgpack, schema_salad.validate, schema_salad.avro, schema_salad.avro.schema, schema_salad.schema, schema_salad.codegen, schema_salad.codegen_base, schema_salad.cpp_codegen, schema_salad.dlang_codegen, schema_salad.dotnet_codegen, schema_salad.java_codegen, schema_salad.python_codegen, black.const, black.mode, black.cache, black._width_table, blib2to3.pgen2.token, blib2to3.pgen2.grammar, blib2to3.pytree, black.strings, pytokens, blib2to3.pgen2.tokenize, blib2to3.pgen2.parse, blib2to3.pgen2.pgen, blib2to3.pgen2.driver, blib2to3.pygram, black.nodes, black.comments, black.handle_ipynb_magics, black.brackets, black.lines, black.numerics, black.rusty, black.trans, black.linegen, black.parsing, black.ranges, black, schema_salad.typescript_codegen, schema_salad.makedoc, schema_salad.main (total: 52)

https://github.com/common-workflow-language/schema_salad/actions/runs/23838170994/job/69486866159#step:6:607

I've also seen it from a mypy 1.19.x compiled package, on Debian's CI 

Fatal Python error: Segmentation fault
116s 
116s Thread 0x00007f428ac5d6c0 [python3.14] (most recent call first):
116s   File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 534 in read
116s   File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 567 in from_io
116s   File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 1160 in _thread_receiver
116s   File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 341 in run
116s   File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 411 in _perform_spawn
116s 
116s Current thread 0x00007f428bc59200 [python3.14] (most recent call first):
116s   Garbage-collecting
116s   File "<string>", line 2 in __init__
116s   File "/usr/lib/python3/dist-packages/schema_salad/tests/test_python_codegen.py", line 68 in python_codegen
116s   File "/usr/lib/python3/dist-packages/schema_salad/tests/test_python_codegen.py", line 81 in test_default_parser_info
116s   File "/usr/lib/python3/dist-packages/_pytest/python.py", line 166 in pytest_pyfunc_call
116s   File "/usr/lib/python3/dist-packages/pluggy/_callers.py", line 121 in _multicall
116s   File "/usr/lib/python3/dist-packages/pluggy/_manager.py", line 120 in _hookexec
116s   File "/usr/lib/python3/dist-packages/pluggy/_hooks.py", line 512 in __call__
116s   File "/usr/lib/python3/dist-packages/_pytest/python.py", line 1720 in runtest
116s   File "/usr/lib/python3/dist-packages/_pytest/runner.py", line 179 in pytest_runtest_call
116s   File "/usr/lib/python3/dist-packages/pluggy/_callers.py", line 121 in _multicall
116s   File "/usr/lib/python3/dist-packages/pluggy/_manager.py", line 120 in _hookexec
116s   File "/usr/lib/python3/dist-packages/pluggy/_hooks.py", line 512 in __call__
116s   File "/usr/lib/python3/dist-packages/_pytest/runner.py", line 245 in <lambda>
116s   File "/usr/lib/python3/dist-packages/_pytest/runner.py", line 353 in from_call
116s   File "/usr/lib/python3/dist-packages/_pytest/runner.py", line 244 in call_and_report
116s   File "/usr/lib/python3/dist-packages/_pytest/runner.py", line 137 in runtestprotocol
116s   File "/usr/lib/python3/dist-packages/_pytest/runner.py", line 118 in pytest_runtest_protocol
116s   File "/usr/lib/python3/dist-packages/pluggy/_callers.py", line 121 in _multicall
116s   File "/usr/lib/python3/dist-packages/pluggy/_manager.py", line 120 in _hookexec
116s   File "/usr/lib/python3/dist-packages/pluggy/_hooks.py", line 512 in __call__
116s   File "/usr/lib/python3/dist-packages/xdist/remote.py", line 227 in run_one_test
116s   File "/usr/lib/python3/dist-packages/xdist/remote.py", line 206 in pytest_runtestloop
116s   File "/usr/lib/python3/dist-packages/pluggy/_callers.py", line 121 in _multicall
116s   File "/usr/lib/python3/dist-packages/pluggy/_manager.py", line 120 in _hookexec
116s   File "/usr/lib/python3/dist-packages/pluggy/_hooks.py", line 512 in __call__
116s   File "/usr/lib/python3/dist-packages/_pytest/main.py", line 372 in _main
116s   File "/usr/lib/python3/dist-packages/_pytest/main.py", line 318 in wrap_session
116s   File "/usr/lib/python3/dist-packages/_pytest/main.py", line 365 in pytest_cmdline_main
116s   File "/usr/lib/python3/dist-packages/pluggy/_callers.py", line 121 in _multicall
116s   File "/usr/lib/python3/dist-packages/pluggy/_manager.py", line 120 in _hookexec
116s   File "/usr/lib/python3/dist-packages/pluggy/_hooks.py", line 512 in __call__
116s   File "/usr/lib/python3/dist-packages/xdist/remote.py", line 427 in <module>
116s   File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 1291 in executetask
116s   File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 341 in run
116s   File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 411 in _perform_spawn
116s   File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 389 in integrate_as_primary_thread
116s   File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 1273 in serve
116s   File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 1806 in serve
116s   File "<string>", line 8 in <module>
116s   File "<string>", line 1 in <module>
116s 
116s Current thread's C stack trace (most recent call first):
116s   Binary file "/usr/bin/python3.14", at _Py_DumpStack+0x4a [0x471b87]
116s   Binary file "/usr/bin/python3.14" [0x4f935c]
116s   Binary file "/usr/lib/x86_64-linux-gnu/libc.so.6", at +0x40a70 [0x7f428bc9aa70]
116s   Binary file "/usr/bin/python3.14" [0x5f881c]
116s   Binary file "/usr/bin/python3.14" [0x613b66]
116s   Binary file "/usr/bin/python3.14" [0x612b6a]
116s   Binary file "/usr/bin/python3.14" [0x557bb0]
116s   Binary file "/usr/bin/python3.14", at _Py_HandlePending+0x3b [0x67baab]
116s   Binary file "/usr/bin/python3.14", at _PyEval_EvalFrameDefault+0xeab2 [0x551732]
116s   Binary file "/usr/bin/python3.14" [0x581384]
116s   Binary file "/usr/bin/python3.14" [0x52cbbe]
116s   Binary file "/usr/bin/python3.14" [0x589d9c]
116s   Binary file "/usr/lib/python3/dist-packages/fd7dcdb10166ebd4db98__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_pytokens___Token+0x3f [0x7f428827b54f]
116s   Binary file "/usr/lib/python3/dist-packages/fd7dcdb10166ebd4db98__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_pytokens___TokenIterator___make_token+0x4ea [0x7f428827e57a]
116s   Binary file "/usr/lib/python3/dist-packages/fd7dcdb10166ebd4db98__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_pytokens___TokenIterator_____next__+0x3467 [0x7f428828f307]
116s   Binary file "/usr/bin/python3.14", at PyIter_Next+0x12 [0x521db2]
116s   Binary file "/usr/lib/python3/dist-packages/fec286f4eda846987175__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_tokenize___tokenize_gen_____mypyc_generator_helper__+0x420 [0x7f4283f082d0]
116s   Binary file "/usr/bin/python3.14" [0x60e1bd]
116s   Binary file "/usr/bin/python3.14", at PyObject_Vectorcall+0x32 [0x52b902]
116s   Binary file "/usr/lib/python3/dist-packages/fec286f4eda846987175__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_driver___TokenProxy_____next__+0x1d2 [0x7f4283d39492]
116s   Binary file "/usr/bin/python3.14", at PyIter_Next+0x12 [0x521db2]
116s   Binary file "/usr/lib/python3/dist-packages/fec286f4eda846987175__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_driver___Driver___parse_tokens+0xb60 [0x7f4283ef3290]
116s   Binary file "/usr/lib/python3/dist-packages/fec286f4eda846987175__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_driver___Driver___parse_string+0x4d [0x7f4283f0e20d]
116s   Binary file "/usr/lib/python3/dist-packages/fec286f4eda846987175__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_parsing___lib2to3_parse+0x1c6 [0x7f4283f0e476]
116s   Binary file "/usr/lib/python3/dist-packages/fec286f4eda846987175__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_black____format_str_once+0xe3 [0x7f4283f10a53]
116s   Binary file "/usr/lib/python3/dist-packages/fec286f4eda846987175__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_black___format_str+0x50 [0x7f4283f12850]
116s   Binary file "/usr/lib/python3/dist-packages/fec286f4eda846987175__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyPy_black___format_str+0x7c [0x7f4283f12cac]
116s   Binary file "/usr/bin/python3.14", at PyObject_Vectorcall+0x32 [0x52b902]
116s   Binary file "/usr/lib/python3/dist-packages/5df31530eea7292b5dae__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_python_codegen___fmt+0x24c [0x7f428912f66c]
116s   Binary file "/usr/lib/python3/dist-packages/5df31530eea7292b5dae__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_python_codegen___PythonCodeGen___begin_class+0x117 [0x7f428914e647]
116s   Binary file "/usr/lib/python3/dist-packages/5df31530eea7292b5dae__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_codegen___codegen+0xdc76 [0x7f428920ece6]
116s   Binary file "/usr/lib/python3/dist-packages/5df31530eea7292b5dae__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyPy_codegen___codegen+0x2ca [0x7f428920f78a]
116s   <truncated rest of calls>
116s 
117s Extension modules: schema_salad, _ruamel_yaml, charset_normalizer.md, schema_salad.utils, schema_salad.sourceline, schema_salad.jsonld_context, msgpack._cmsgpack, schema_salad.ref_resolver, schema_salad.avro., schema_salad.avro.schema, schema_salad.validate, schema_salad.schema, schema_salad.codegen_base, schema_salad.cpp_codegen, schema_salad.dlang_codegen, schema_salad.java_codegen, schema_salad.dotnet_codegen, _black_version, black.const, black.mode, black.cache, black._width_table, blib2to3.pgen2.token, blib2to3.pgen2.grammar, blib2to3.pytree, black.strings, pytokens, blib2to3.pgen2.tokenize, blib2to3.pgen2.parse, blib2to3.pgen2.pgen, blib2to3.pgen2.driver, blib2to3.pygram, black.nodes, black.comments, black.handle_ipynb_magics, black.brackets, black.lines, black.numerics, black.rusty, black.trans, black.linegen, black.parsing, black.ranges, black, schema_salad.python_codegen, schema_salad.typescript_codegen, schema_salad.codegen, schema_salad.makedoc, schema_salad.main (total: 49)

https://ci.debian.net/packages/p/python-schema-salad/unstable/amd64/69657169/

Never an issue with Python 3.13.x

Activity

  1. mr-c
    added
    bugmypy got something wrong
    on Apr 1, 2026
  2. mr-c
    changed the title [-]python3.14: occaisional crashes with mypyc compiled code[/-] [+]python3.14: occasional crashes with mypyc compiled code[/+] on Apr 1, 2026
  3. hauntsaninja
    added
    priority-0-high
    on Apr 1, 2026

  4. bjorndbuilder commented on Apr 3, 2026

    bjorndbuilder
    on Apr 3, 2026

    Just FYI: I had mypy 1.20.0 crashing in my CI with exit code 139 (SIGSERV), which was resolved by passing --cache-dir /dev/null (because the cache dir is not writeable) so that should give a hint where this issue is located in mypy.

  5. mr-c commented on Apr 3, 2026

    mr-c
    on Apr 3, 2026
    ContributorAuthor

    @hauntsaninja Sorry for not posting this sooner, I was hoping that the 1.20 release was going to fix this problem. If you have issues reproducing I can probably whip up a Dockerfile that does it

  6. mr-c commented on Apr 3, 2026

    mr-c
    on Apr 3, 2026
    ContributorAuthor

    @bjorndbuilder Thanks for the report; sounds like that is a separate issue (or is a duplicate of #21136 ); this issue is about code that is first successfully compiled with mypyc that then later crashes, so the mypy --cache-dir /dev/null workaround isn't applicable.

  7. hauntsaninja commented on Apr 3, 2026

    hauntsaninja
    on Apr 3, 2026
    Collaborator

    Yes, if you could share a Dockerfile that would help!

  8. mr-c commented on Apr 4, 2026

    mr-c
    on Apr 4, 2026
    ContributorAuthor

    @hauntsaninja here you go!

    FROM docker.io/debian:unstable-20260316-slim

RUN printf 'Types: deb\nURIs: http://snapshot.debian.org/archive/debian/20260404T202920Z/\nSuites: unstable\nComponents: main\nSigned-By: /usr/share/keyrings/debian-archive-keyring.pgp' > /etc/apt/sources.list.d/debian.sources && apt-get -o Acquire::Check-Valid-Until=false update && apt-get install -y --no-install-recommends python3.14 python3-schema-salad==8.9.20251102115403-1 python3-pytest-xdist
WORKDIR /build
RUN python3.14 -m pytest --pyargs schema_salad -n auto -vvv

    (python3-schema-salad 8.9.20251102115403-1 was compiled with mypy 1.19.1)

    the full segfault + stacktrace from using this Dockerfile 

    [gw7] [ 55%] PASSED tests/test_print_oneline.py::test_for_invalid_yaml1 <- ../usr/lib/python3/dist-packages/schema_salad/tests/test_print_oneline.py 
tests/test_python_codegen.py::test_meta_schema_gen_up_to_date <- ../usr/lib/python3/dist-packages/schema_salad/tests/test_python_codegen.py Fatal Python error: Segmentation fault

Thread 0x00007f4c2e56a6c0 [python3.14] (most recent call first):
  File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 534 in read
  File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 567 in from_io
  File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 1160 in _thread_receiver
  File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 341 in run
  File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 411 in _perform_spawn

Current thread 0x00007f4c2f27a200 [python3.14] (most recent call first):
  Garbage-collecting
  File "/usr/lib/python3/dist-packages/ruamel/yaml/scanner.py", line 148 in reader
  File "/usr/lib/python3/dist-packages/ruamel/yaml/scanner.py", line 1590 in scan_plain_spaces
  File "/usr/lib/python3/dist-packages/ruamel/yaml/scanner.py", line 1552 in scan_plain
  File "/usr/lib/python3/dist-packages/ruamel/yaml/scanner.py", line 715 in fetch_plain
  File "/usr/lib/python3/dist-packages/ruamel/yaml/scanner.py", line 310 in fetch_more_tokens
  File "/usr/lib/python3/dist-packages/ruamel/yaml/scanner.py", line 1775 in _gather_comments
  File "/usr/lib/python3/dist-packages/ruamel/yaml/scanner.py", line 1735 in check_token
  File "/usr/lib/python3/dist-packages/ruamel/yaml/parser.py", line 535 in parse_block_sequence_entry
  File "/usr/lib/python3/dist-packages/ruamel/yaml/parser.py", line 141 in check_event
  File "/usr/lib/python3/dist-packages/ruamel/yaml/composer.py", line 172 in compose_sequence_node
  File "/usr/lib/python3/dist-packages/ruamel/yaml/composer.py", line 128 in compose_node
  File "/usr/lib/python3/dist-packages/ruamel/yaml/composer.py", line 212 in compose_mapping_node
  File "/usr/lib/python3/dist-packages/ruamel/yaml/composer.py", line 130 in compose_node
  File "/usr/lib/python3/dist-packages/ruamel/yaml/composer.py", line 173 in compose_sequence_node
  File "/usr/lib/python3/dist-packages/ruamel/yaml/composer.py", line 128 in compose_node
  File "/usr/lib/python3/dist-packages/ruamel/yaml/composer.py", line 212 in compose_mapping_node
  File "/usr/lib/python3/dist-packages/ruamel/yaml/composer.py", line 130 in compose_node
  File "/usr/lib/python3/dist-packages/ruamel/yaml/composer.py", line 212 in compose_mapping_node
  File "/usr/lib/python3/dist-packages/ruamel/yaml/composer.py", line 130 in compose_node
  File "/usr/lib/python3/dist-packages/ruamel/yaml/composer.py", line 212 in compose_mapping_node
  File "/usr/lib/python3/dist-packages/ruamel/yaml/composer.py", line 130 in compose_node
  File "/usr/lib/python3/dist-packages/ruamel/yaml/composer.py", line 173 in compose_sequence_node
  File "/usr/lib/python3/dist-packages/ruamel/yaml/composer.py", line 128 in compose_node
  File "/usr/lib/python3/dist-packages/ruamel/yaml/composer.py", line 212 in compose_mapping_node
  File "/usr/lib/python3/dist-packages/ruamel/yaml/composer.py", line 130 in compose_node
  File "/usr/lib/python3/dist-packages/ruamel/yaml/composer.py", line 95 in compose_document
  File "/usr/lib/python3/dist-packages/ruamel/yaml/composer.py", line 63 in get_node
  File "/usr/lib/python3/dist-packages/ruamel/yaml/constructor.py", line 113 in get_data
  File "/usr/lib/python3/dist-packages/ruamel/yaml/main.py", line 480 in load_all
  File "/usr/lib/python3/dist-packages/schema_salad/tests/test_print_oneline.py", line 49 in test_print_oneline_for_invalid_yaml
  File "/usr/lib/python3/dist-packages/_pytest/python.py", line 166 in pytest_pyfunc_call
  File "/usr/lib/python3/dist-packages/pluggy/_callers.py", line 121 in _multicall
  File "/usr/lib/python3/dist-packages/pluggy/_manager.py", line 120 in _hookexec
  File "/usr/lib/python3/dist-packages/pluggy/_hooks.py", line 512 in __call__
  File "/usr/lib/python3/dist-packages/_pytest/python.py", line 1720 in runtest
  File "/usr/lib/python3/dist-packages/_pytest/runner.py", line 179 in pytest_runtest_call
  File "/usr/lib/python3/dist-packages/pluggy/_callers.py", line 121 in _multicall
  File "/usr/lib/python3/dist-packages/pluggy/_manager.py", line 120 in _hookexec
  File "/usr/lib/python3/dist-packages/pluggy/_hooks.py", line 512 in __call__
  File "/usr/lib/python3/dist-packages/_pytest/runner.py", line 245 in <lambda>
  File "/usr/lib/python3/dist-packages/_pytest/runner.py", line 353 in from_call
  File "/usr/lib/python3/dist-packages/_pytest/runner.py", line 244 in call_and_report
  File "/usr/lib/python3/dist-packages/_pytest/runner.py", line 137 in runtestprotocol
  File "/usr/lib/python3/dist-packages/_pytest/runner.py", line 118 in pytest_runtest_protocol
  File "/usr/lib/python3/dist-packages/pluggy/_callers.py", line 121 in _multicall
  File "/usr/lib/python3/dist-packages/pluggy/_manager.py", line 120 in _hookexec
  File "/usr/lib/python3/dist-packages/pluggy/_hooks.py", line 512 in __call__
  File "/usr/lib/python3/dist-packages/xdist/remote.py", line 227 in run_one_test
  File "/usr/lib/python3/dist-packages/xdist/remote.py", line 206 in pytest_runtestloop
  File "/usr/lib/python3/dist-packages/pluggy/_callers.py", line 121 in _multicall
  File "/usr/lib/python3/dist-packages/pluggy/_manager.py", line 120 in _hookexec
  File "/usr/lib/python3/dist-packages/pluggy/_hooks.py", line 512 in __call__
  File "/usr/lib/python3/dist-packages/_pytest/main.py", line 372 in _main
  File "/usr/lib/python3/dist-packages/_pytest/main.py", line 318 in wrap_session
  File "/usr/lib/python3/dist-packages/_pytest/main.py", line 365 in pytest_cmdline_main
  File "/usr/lib/python3/dist-packages/pluggy/_callers.py", line 121 in _multicall
  File "/usr/lib/python3/dist-packages/pluggy/_manager.py", line 120 in _hookexec
  File "/usr/lib/python3/dist-packages/pluggy/_hooks.py", line 512 in __call__
  File "/usr/lib/python3/dist-packages/xdist/remote.py", line 427 in <module>
  File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 1291 in executetask
  File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 341 in run
  File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 411 in _perform_spawn
  File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 389 in integrate_as_primary_thread
  File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 1273 in serve
  File "/usr/lib/python3/dist-packages/execnet/gateway_base.py", line 1806 in serve
  File "<string>", line 8 in <module>
  File "<string>", line 1 in <module>

Current thread's C stack trace (most recent call first):
  Binary file "/usr/bin/python3.14", at _Py_DumpStack+0x4a [0x4736bf]
  Binary file "/usr/bin/python3.14" [0x4fcfde]
  Binary file "/usr/lib/x86_64-linux-gnu/libc.so.6", at +0x40a70 [0x7f4c2f2bba70]
  Binary file "/usr/bin/python3.14" [0x5fca3c]
  Binary file "/usr/bin/python3.14" [0x618166]
  Binary file "/usr/bin/python3.14" [0x617b12]
  Binary file "/usr/bin/python3.14" [0x55a497]
  Binary file "/usr/bin/python3.14", at _Py_HandlePending+0x3b [0x682cab]
  Binary file "/usr/bin/python3.14", at _PyEval_EvalFrameDefault+0xf5c5 [0x554865]
  Binary file "/usr/bin/python3.14" [0x6128c7]
  Binary file "/usr/bin/python3.14", at PyObject_Vectorcall+0x32 [0x52de02]
  Binary file "/usr/lib/python3/dist-packages/5df31530eea7292b5dae__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_ref_resolver___Loader___fetch+0x2cd [0x7f4c2cbc8f2d]
  Binary file "/usr/lib/python3/dist-packages/5df31530eea7292b5dae__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_ref_resolver___Loader___resolve_ref+0x3797 [0x7f4c2cb8ad47]
  Binary file "/usr/lib/python3/dist-packages/5df31530eea7292b5dae__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_ref_resolver___Loader___resolve_all+0x395d [0x7f4c2cb93e4d]
  Binary file "/usr/lib/python3/dist-packages/5df31530eea7292b5dae__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_schema_salad___schema___get_metaschema+0x2e3b [0x7f4c2cc1900b]
  Binary file "/usr/lib/python3/dist-packages/5df31530eea7292b5dae__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyDef_schema_salad___schema___load_schema+0x54 [0x7f4c2cc1c484]
  Binary file "/usr/lib/python3/dist-packages/5df31530eea7292b5dae__mypyc.cpython-314-x86_64-linux-gnu.so", at CPyPy_schema_salad___schema___load_schema+0x8d [0x7f4c2cc1d52d]
  Binary file "/usr/bin/python3.14", at PyObject_Vectorcall+0x32 [0x52de02]
  Binary file "/usr/bin/python3.14", at _PyEval_EvalFrameDefault+0x3581 [0x548821]
  Binary file "/usr/bin/python3.14" [0x584764]
  Binary file "/usr/bin/python3.14" [0x52f09e]
  Binary file "/usr/bin/python3.14" [0x629c4b]
  Binary file "/usr/bin/python3.14", at _PyObject_MakeTpCall+0x35c [0x527d2c]
  Binary file "/usr/bin/python3.14", at _PyEval_EvalFrameDefault+0x661c [0x54b8bc]
  Binary file "/usr/bin/python3.14" [0x584764]
  Binary file "/usr/bin/python3.14" [0x52f09e]
  Binary file "/usr/bin/python3.14" [0x629c4b]
  Binary file "/usr/bin/python3.14" [0x59d23d]
  Binary file "/usr/bin/python3.14", at _PyEval_EvalFrameDefault+0x464c [0x5498ec]
  Binary file "/usr/bin/python3.14" [0x584764]
  Binary file "/usr/bin/python3.14" [0x52f09e]
  Binary file "/usr/bin/python3.14" [0x629c4b]
  <truncated rest of calls>

Extension modules: schema_salad, _ruamel_yaml, charset_normalizer.md, schema_salad.utils, schema_salad.sourceline, schema_salad.jsonld_context, msgpack._cmsgpack, schema_salad.ref_resolver, schema_salad.avro, schema_salad.avro.schema, schema_salad.validate, schema_salad.schema, schema_salad.codegen_base, schema_salad.cpp_codegen, schema_salad.dlang_codegen, schema_salad.java_codegen, schema_salad.dotnet_codegen, schema_salad.python_codegen, schema_salad.typescript_codegen, schema_salad.codegen, schema_salad.makedoc, schema_salad.main (total: 22)

[gw2] node down: Not properly terminated

  9. mr-c commented on Apr 6, 2026

    mr-c
    on Apr 6, 2026
    ContributorAuthor

    @hauntsaninja I can make a mypy 1.20 example as well, if that would help

  10. mr-c commented on Apr 14, 2026

    mr-c
    on Apr 14, 2026
    ContributorAuthor

    I'm still seeing these crashes with my 1.20.1

  11. mr-c
    added a commit that references this issue on Apr 16, 2026

    turn off mypyc until python/mypy#21133 is fixed

    586f3d0

  12. mr-c commented on Apr 16, 2026

    mr-c
    on Apr 16, 2026
    ContributorAuthor

    FYI: I've had to disable the use of mypyc for schema-salad as part of the Debian and conda packages. I see that black is also having issue upgrading mypy, but I don't know if that is related: psf/black#5071

  13. p-sawicki
    self-assigned this
    on Apr 16, 2026

  14. hauntsaninja commented on Apr 16, 2026

    hauntsaninja
    on Apr 16, 2026
    Collaborator

    Black's issue is something else. The failure mode is ModuleNotFoundError: No module named 'black.output'; 'black' is not a package. Maybe related to #21101 from @JukkaL

    I haven't had time to look into schema salad issue (and probably won't for a few days, and am not a mypyc guy in general), but I see Piotr has self-assigned this!

  15. ilevkivskyi
    added
    topic-mypycmypyc bugs
    on Apr 20, 2026

  16. p-sawicki commented on Apr 21, 2026

    p-sawicki
    on Apr 21, 2026
    Collaborator

    yeah the import issue is most likely not related.

    @mr-c i couldn't reproduce the crash with the dockerfile or when running tests locally with compiled schema_salad. is there another way to see it?

  17. mr-c commented on Apr 21, 2026

    mr-c
    on Apr 21, 2026
    ContributorAuthor

    @p-sawicki Thanks for testing; I just now updated the Dockerfile in #21133 (comment) to use snapshot.debian.org; since posting the previous version I uploaded a new version of the python3-schema-salad binary package that was built without using mypyc.

    Using the updated Dockerfile, the test error still reproduces for me

  18. hauntsaninja commented on Apr 21, 2026

    hauntsaninja
    on Apr 21, 2026
    Collaborator

    I threw it at Codex and it worked for a long, long time, then produced this repro:

    root@bbox-0:~/tmp/mypy-21133-min-normdict λ ls
README.md  normdict_repro.py  run.sh  setup.py  trigger.py
root@bbox-0:~/tmp/mypy-21133-min-normdict λ cat README.md        
# mypy#21133 minimal NormDict crash

This is a standalone reduction of the schema-salad crash from
https://github.com/python/mypy/issues/21133.

The trigger is a mypyc-compiled class that subclasses `dict` and has an
instance attribute:

.```python
class NormDict(dict[str, str]):
    def __init__(self, normalize_fn: Callable[[str], str] = str) -> None:
        super().__init__()
        self.normalize: Final = normalize_fn
.```

On Debian sid with Python 3.14 and mypy/mypyc 1.19.1:

.```sh
./run.sh
.```

The compiled type exposes a managed `__dict__`. If interpreted Python keeps a
reference to that dictionary, then deletes the owning `NormDict`, the dictionary
object is left with invalid internal storage:

.```python
n = NormDict()
d = n.__dict__
del n
print(d)
.```

With `PYTHONMALLOC=debug`, this segfaults while printing `d`. In the full
schema-salad failure, mypyc's generated pickling support reads/stores
`Loader.idx.__dict__`; `Loader.idx` is a `NormDict`, so later cleanup or GC
traverses the invalid dictionary and crashes in `dict_traverse`.
root@bbox-0:~/tmp/mypy-21133-min-normdict λ cat setup.py 
from setuptools import setup
from mypyc.build import mypycify


setup(
    name="normdict-repro",
    ext_modules=mypycify(["normdict_repro.py"], opt_level="3", debug_level="0"),
)
root@bbox-0:~/tmp/mypy-21133-min-normdict λ cat trigger.py 
from normdict_repro import NormDict


n = NormDict()
d = n.__dict__
print("before", d, flush=True)
del n
print("after", d, flush=True)
root@bbox-0:~/tmp/mypy-21133-min-normdict λ cat normdict_repro.py 
from __future__ import annotations

from typing import Callable, Final


class NormDict(dict[str, str]):
    def __init__(self, normalize_fn: Callable[[str], str] = str) -> None:
        super().__init__()
        self.normalize: Final = normalize_fn


def main() -> None:
    n = NormDict()
    d = n.__dict__
    print("before", d, flush=True)
    del n
    print("after", d, flush=True)


if __name__ == "__main__":
    main()
root@bbox-0:~/tmp/mypy-21133-min-normdict λ cat run.sh 
#!/bin/sh
set -eu

PYTHON_BIN="${PYTHON_BIN:-python3.14}"
VENV="${VENV:-.venv}"

"$PYTHON_BIN" -m venv --system-site-packages "$VENV"
"$VENV/bin/python" -m pip install -U pip setuptools wheel
"$VENV/bin/python" -m pip install "mypy[mypyc]==1.19.1"

rm -rf build *.egg-info *.so
"$VENV/bin/python" setup.py build_ext --inplace
PYTHONMALLOC=debug PYTHONFAULTHANDLER=1 "$VENV/bin/python" trigger.py

    This definitely segfaults, but I didn't check anything else.

  19. mr-c commented on Apr 22, 2026

    mr-c
    on Apr 22, 2026
    ContributorAuthor

    Thank you @hauntsaninja ; I can confirm your minimal reproducer using a stock Python 3.14.2 compiled by pyenv

  20. mr-c commented on Apr 22, 2026

    mr-c
    on Apr 22, 2026
    ContributorAuthor

    repro crash confirmed with mypy 1.16.1 through 1.20.1 on Python 3.14.2; and unable to confirm with Python 3.13.5

  21. p-sawicki commented on Apr 22, 2026

    p-sawicki
    on Apr 22, 2026
    Collaborator

    awesome, thanks for the reproduction. it looks like mypyc doesn't generate the necessary type functions (tp_traverse, tp_clear, tp_dealloc) for types with managed dicts. python 3.14 made it so the values stored in the managed dicts are stored inline with the instance and this doesn't work without the missing type functions. so i think we'll just have to generate these functions.

  22. p-sawicki
    closed this as completedin #21290on Apr 23, 2026
  23. p-sawicki
    added a commit that references this issue on Apr 23, 2026

    [mypyc] Generate more type methods for types with managed dicts (#21290)

    c56ab58

  24. mr-c commented on Apr 23, 2026

    mr-c
    on Apr 23, 2026
    ContributorAuthor

    I can confirm that c56ab58 fixed the schema-salad crashes (and I double-check that the parent commit did still have the crashes). Thank you @p-sawicki !

  25. mr-c
    added 3 commits that reference this issue on Apr 25, 2026

    re-enable mypyc on Python << 3.14 due to python/mypy#21133

    5e48af8

    re-enable mypyc on Python << 3.14 due to python/mypy#21133

    727c059

    re-enable mypyc on Python << 3.14 due to python/mypy#21133

    b0ce83a
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