Description

mgorny

opened on Jun 1, 2024

Issue body actions

Crash report

What happened?

When CPython 3.12 is built with assertions enabled, the following snippet causes the interpreter to crash:

x = lambda: (yield 3)
next(x())

$ ./python /tmp/LambdasTest.py 
python: Objects/genobject.c:400: gen_close: Assertion `exception_handler_depth > 0' failed.
Aborted (core dumped)

This doesn't happen with 3.11 or with main. From a quick bisect:

• [3.12] gh-100762: Fix optimization in gen_close (GH-111069) #115818 (eb4774d) broke it on 3.12
• gh-111354: simplify detection of RESUME after YIELD_VALUE at except-depth 1  #111459 (52cc4af) fixed it on main

This was triggered in the wild by Nuitka's test suite: Nuitka/Nuitka#2893.

CC @iritkatriel

CPython versions tested on:

3.12

Operating systems tested on:

Linux

Output from running 'python -VV' on the command line:

Python 3.12.3+ (heads/3.12:6d9677d78e, Jun 1 2024, 11:06:51) [GCC 14.1.1 20240516]

Linked PRs

• [3.12] gh-119897: Revert buggy optimization which was removed in 3.13 #120467
• gh-119897: Add test for lambda generator invocation #120658
• [3.13] gh-119897: Add test for lambda generator invocation (GH-120658) #120673

Activity

1. mgorny

   added

   type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

   on Jun 1, 2024
2. Eclips4

   added

   3.12only security fixesonly security fixes

   interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

   on Jun 1, 2024
3. mgorny commented on Jun 10, 2024

   

   mgorny

   on Jun 10, 2024

   ContributorAuthor

   More actions

   Gentle ping.
4. mgorny commented on Jun 12, 2024

   

   mgorny

   on Jun 12, 2024

   ContributorAuthor

   More actions

   Given no reply, I'm going to revert this change in Gentoo. Hope that doesn't cause more issues.
5. gentoo-bot

   added a commit that references this issue on Jun 12, 2024

   dev-lang/python: Bump to 3.12.4_p1

   f7e34ff
6. iritkatriel

   self-assigned this

   on Jun 13, 2024
7. iritkatriel commented on Jun 13, 2024

   

   iritkatriel

   on Jun 13, 2024

   Member

   More actions

   Thanks. I agree, let's revert the bad commit in 3.12.
8. iritkatriel

   added a commit that references this issue on Jun 18, 2024

   gh-119897: Add test for lambda generator invocation (#120658)

   73dc1c6
9. miss-islington

   added a commit that references this issue on Jun 18, 2024

   pythongh-119897: Add test for lambda generator invocation (pythonGH-1…

   88395b5
10. iritkatriel

    added a commit that references this issue on Jun 18, 2024

    [3.12] gh-119897: Revert buggy optimization which was removed in 3.13 (…

    5d997b5
11. iritkatriel commented on Jun 18, 2024

    

    iritkatriel

    on Jun 18, 2024

    Member

    More actions

    Thanks.
12. iritkatriel

    closed this as completedon Jun 18, 2024
13. mgorny commented on Jun 18, 2024

    

    mgorny

    on Jun 18, 2024

    ContributorAuthor

    More actions

    Thank you!
14. iritkatriel

    added a commit that references this issue on Jun 18, 2024

    [3.13] gh-119897: Add test for lambda generator invocation (GH-120658) (

    692874c
15. mrahtz

    added a commit that references this issue on Jun 30, 2024

    pythongh-119897: Add test for lambda generator invocation (python#120658

    bed6d9c
16. estyxx

    added a commit that references this issue on Jul 17, 2024

    pythongh-119897: Add test for lambda generator invocation (python#120658

    c70aa2b

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