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Crash in substitution of nested TypeVar after TypeVarTuple #93345

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#93346
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Crash in substitution of nested TypeVar after TypeVarTuple#93345
#93346
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3.11only security fixes3.12only security fixestopic-typingtype-crashA hard crash of the interpreter, possibly with a core dump

Description

@serhiy-storchaka
serhiy-storchaka
opened on May 30, 2022

During work on #93330 I have found an error in the C code which causes crash when substitute a TypeVar in nested generic alias after TypeVarTuple.

For example:

>>> from typing import *
>>> T = TypeVar('T')
>>> Ts = TypeVarTuple('Ts')
>>> tuple[*Ts, list[T]][int, str, bool]
Segmentation fault (core dumped)

Activity

  1. serhiy-storchaka
    added
    3.11only security fixes
    type-crashA hard crash of the interpreter, possibly with a core dump
    topic-typing
    3.12only security fixes
    on May 30, 2022
  2. serhiy-storchaka
    added a commit that references this issue on May 30, 2022

    pythongh-93345: Fix a crash in substitution of nested TypeVar after T…

    f8005fc
  3. serhiy-storchaka
    closed this as completedin #93346on May 31, 2022
  4. serhiy-storchaka
    added a commit that references this issue on May 31, 2022

    gh-93345: Fix a crash in substitution of nested TypeVar after TypeVar…

    f545fc9
  5. serhiy-storchaka
    reopened this on May 31, 2022
  6. serhiy-storchaka
    added
    release-blocker
    on May 31, 2022
  7. miss-islington
    added 2 commits that reference this issue on Jun 1, 2022

    pythongh-93345: Fix a crash in substitution of nested TypeVar after T…

    ba4da2a

    gh-93345: Fix a crash in substitution of nested TypeVar after TypeVar…

    3265ff9
  8. serhiy-storchaka
    removed
    release-blocker
    on Jun 1, 2022
  9. serhiy-storchaka
    closed this as completedon Jun 1, 2022
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