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Access violations in C extension modules on Python 3.9.3 #87876

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cgohlke mannequin opened this issue Apr 3, 2021 · 5 comments
Closed

Access violations in C extension modules on Python 3.9.3 #87876

cgohlke mannequin opened this issue Apr 3, 2021 · 5 comments
Labels
3.9 only security fixes extension-modules C modules in the Modules dir OS-windows release-blocker type-crash A hard crash of the interpreter, possibly with a core dump

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@cgohlke
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cgohlke mannequin commented Apr 3, 2021

BPO 43710
Nosy @terryjreedy, @gpshead, @pfmoore, @tjguk, @ambv, @markshannon, @zware, @zooba
PRs
  • [3.9] bpo-43710: Change layout of pystate struct to preserve intra-version ABI compatibiliy. #25160
  • [3.9] bpo-43710: Rollback the 3.9 bpo-42500 fix, it broke the ABI in 3.9.3 #25179
  • Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = None
    closed_at = <Date 2021-04-04.11:03:35.837>
    created_at = <Date 2021-04-03.03:09:40.678>
    labels = ['extension-modules', 'release-blocker', 'OS-windows', 'type-crash', '3.9']
    title = 'Access violations in C extension modules on Python 3.9.3'
    updated_at = <Date 2021-05-03.21:42:14.320>
    user = 'https://bugs.python.org/cgohlke'

    bugs.python.org fields:

    activity = <Date 2021-05-03.21:42:14.320>
    actor = 'terry.reedy'
    assignee = 'none'
    closed = True
    closed_date = <Date 2021-04-04.11:03:35.837>
    closer = 'lukasz.langa'
    components = ['Extension Modules', 'Windows']
    creation = <Date 2021-04-03.03:09:40.678>
    creator = 'cgohlke'
    dependencies = []
    files = []
    hgrepos = []
    issue_num = 43710
    keywords = ['patch']
    message_count = 5.0
    messages = ['390116', '390134', '390172', '390181', '390212']
    nosy_count = 9.0
    nosy_names = ['terry.reedy', 'gregory.p.smith', 'paul.moore', 'tim.golden', 'cgohlke', 'lukasz.langa', 'Mark.Shannon', 'zach.ware', 'steve.dower']
    pr_nums = ['25160', '25179']
    priority = 'release blocker'
    resolution = 'fixed'
    stage = 'resolved'
    status = 'closed'
    superseder = None
    type = 'crash'
    url = 'https://bugs.python.org/issue43710'
    versions = ['Python 3.9']

    @cgohlke
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    cgohlke mannequin commented Apr 3, 2021

    First reported at numpy/numpy#18720

    After upgrading to Python 3.9.3, 32-bit on Windows, importing numpy (installed via pip install numpy) crashes:

    Microsoft Windows [Version 10.0.19041.906]
    C:\Python39-32>python -X dev
    Python 3.9.3 (tags/v3.9.3:e723086, Apr  2 2021, 11:01:03) [MSC v.1928 32 bit (Intel)] on win32
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import numpy
    Windows fatal exception: access violation
    
    Current thread 0x0000105c (most recent call first):
      File "<frozen importlib._bootstrap>", line 228 in _call_with_frames_removed
      File "<frozen importlib._bootstrap_external>", line 1116 in exec_module
      File "<frozen importlib._bootstrap>", line 680 in _load_unlocked
      File "<frozen importlib._bootstrap>", line 986 in _find_and_load_unlocked
      File "<frozen importlib._bootstrap>", line 1007 in _find_and_load
      File "<frozen importlib._bootstrap>", line 228 in _call_with_frames_removed
      File "<frozen importlib._bootstrap_external>", line 1116 in exec_module
      File "<frozen importlib._bootstrap>", line 680 in _load_unlocked
      File "<frozen importlib._bootstrap>", line 986 in _find_and_load_unlocked
      File "<frozen importlib._bootstrap>", line 1007 in _find_and_load
      File "<frozen importlib._bootstrap>", line 228 in _call_with_frames_removed
      File "<frozen importlib._bootstrap_external>", line 1116 in exec_module
      File "<frozen importlib._bootstrap>", line 680 in _load_unlocked
      File "<frozen importlib._bootstrap>", line 986 in _find_and_load_unlocked
      File "<frozen importlib._bootstrap>", line 1007 in _find_and_load
      File "C:\Python39-32\lib\site-packages\numpy\random\_pickle.py", line 1 in <module>
      File "<frozen importlib._bootstrap>", line 228 in _call_with_frames_removed
      File "<frozen importlib._bootstrap_external>", line 790 in exec_module
      File "<frozen importlib._bootstrap>", line 680 in _load_unlocked
      File "<frozen importlib._bootstrap>", line 986 in _find_and_load_unlocked
      File "<frozen importlib._bootstrap>", line 1007 in _find_and_load
      File "<frozen importlib._bootstrap>", line 228 in _call_with_frames_removed
      File "<frozen importlib._bootstrap>", line 1058 in _handle_fromlist
      File "C:\Python39-32\lib\site-packages\numpy\random\__init__.py", line 179 in <module>
      File "<frozen importlib._bootstrap>", line 228 in _call_with_frames_removed
      File "<frozen importlib._bootstrap_external>", line 790 in exec_module
      File "<frozen importlib._bootstrap>", line 680 in _load_unlocked
      File "<frozen importlib._bootstrap>", line 986 in _find_and_load_unlocked
      File "<frozen importlib._bootstrap>", line 1007 in _find_and_load
      File "<frozen importlib._bootstrap>", line 228 in _call_with_frames_removed
      File "<frozen importlib._bootstrap>", line 1058 in _handle_fromlist
      File "C:\Python39-32\lib\site-packages\numpy\__init__.py", line 156 in <module>
      File "<frozen importlib._bootstrap>", line 228 in _call_with_frames_removed
      File "<frozen importlib._bootstrap_external>", line 790 in exec_module
      File "<frozen importlib._bootstrap>", line 680 in _load_unlocked
      File "<frozen importlib._bootstrap>", line 986 in _find_and_load_unlocked
      File "<frozen importlib._bootstrap>", line 1007 in _find_and_load
      File "<stdin>", line 1 in <module>
    

    Rebuilding numpy from source against Python 3.9.3 fixes this crash, but many other packages compiled against older versions of Python 3.9.x still crash.

    I think this might be due to <8b795ab#diff-7285576bdacf86fe37274d3d0d399c29b4be2959005f60ac0729615d8fca9186%5C%3E.

    In bpo-42500: Fix recursion in or after except (GH-23568) (bpo-24501), the public PyThreadState struct changed. This breaks ABI compatibility for code that is directly accessing the PyThreadState struct members, which is not uncommon. E.g. in Cython https://github.com/cython/cython/blob/0.29.x/Cython/Utility/Exceptions.c#L93-L115. This code will fail on 32-bit. On 64-bit it passes because of fortunate struct alignment AFAICT.

    @cgohlke cgohlke mannequin added extension-modules C modules in the Modules dir OS-windows 3.9 only security fixes type-crash A hard crash of the interpreter, possibly with a core dump labels Apr 3, 2021
    @ambv
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    ambv commented Apr 3, 2021

    Tomorrow evening CEST (around 30 hours from now) I intend to release a hotfix 3.9.4 with Mark's fix.

    @gpshead
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    gpshead commented Apr 4, 2021

    I really suggest a simple rollback (revert) of the change rather than a redo-fix for 3.9.4. Unless you like the idea of a possible 3.9.5 if the redo-fix itself has issues that haven't been given due thought in the rush to undo the 3.9.3 mistake.

    This leaves more time for a proper fix of bpo-42500 in 3.9 not crafted under duress.

    @ambv
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    ambv commented Apr 4, 2021

    New changeset c7b0fec by Gregory P. Smith in branch '3.9':
    [3.9] bpo-43710: Rollback the 3.9 bpo-42500 fix, it broke the ABI in 3.9.3 (bpo-25179)
    c7b0fec

    @ambv ambv closed this as completed Apr 4, 2021
    @ambv ambv closed this as completed Apr 4, 2021
    @cgohlke
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    cgohlke mannequin commented Apr 4, 2021

    Thank you for fixing this issue so fast! Python 3.9.4 works well.

    @sai sai mannequin added topic-IDLE and removed extension-modules C modules in the Modules dir OS-windows labels May 3, 2021
    @sai sai mannequin assigned terryjreedy May 3, 2021
    @sai sai mannequin added topic-IDLE and removed extension-modules C modules in the Modules dir OS-windows labels May 3, 2021
    @sai sai mannequin assigned terryjreedy May 3, 2021
    @terryjreedy terryjreedy added extension-modules C modules in the Modules dir OS-windows and removed topic-IDLE labels May 3, 2021
    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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