Skip to content

Thread sanitizer (free-threading) tests fail: test_signal raises RecursionError #121065

Open
Open
Thread sanitizer (free-threading) tests fail: test_signal raises RecursionError#121065
Labels
testsTests in the Lib/test dirtopic-free-threadingtype-bugAn unexpected behavior, bug, or error

Description

@sobolevn
sobolevn
opened on Jun 26, 2024

Bug report

 0:02:53 load avg: 5.00 [ 9/22/1] test_signal failed (1 error) (1 min 1 sec) -- running (3): test_logging (2 min 13 sec), test_io (2 min 17 sec), test_queue (1 min 52 sec)
test test_signal failed -- Traceback (most recent call last):
  File "/home/runner/work/cpython/cpython/Lib/test/test_signal.py", line 1384, in test_stress_modifying_handlers
    cycle_handlers()
    ~~~~~~~~~~~~~~^^
  File "/home/runner/work/cpython/cpython/Lib/test/test_signal.py", line 1374, in cycle_handlers
    signal.signal(signum, handler)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/home/runner/work/cpython/cpython/Lib/signal.py", line 58, in signal
    handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
                             ~~~~~~~~~~~~^^^^^^^^^^^
  File "/home/runner/work/cpython/cpython/Lib/signal.py", line 41, in _enum_to_int
    return int(value)
  File "/home/runner/work/cpython/cpython/Lib/test/test_signal.py", line 1359, in custom_handler
    def custom_handler(signum, frame):
    
  File "/home/runner/work/cpython/cpython/Lib/test/test_signal.py", line 1359, in custom_handler
    def custom_handler(signum, frame):
    
  File "/home/runner/work/cpython/cpython/Lib/test/test_signal.py", line 1359, in custom_handler
    def custom_handler(signum, frame):
    
  [Previous line repeated 237 more times]
RecursionError: maximum recursion depth exceeded

Link: https://github.com/python/cpython/actions/runs/9686054998/job/26727620578

Linked PRs

Activity

  1. sobolevn
    added
    type-bugAn unexpected behavior, bug, or error
    testsTests in the Lib/test dir
    topic-free-threading
    on Jun 26, 2024

  2. skirpichev commented on Jun 27, 2024

    @skirpichev
    skirpichev
    on Jun 27, 2024
    Member

    I don't see similar failures before this merge: 22b0de2

  3. Fidget-Spinner commented on Jun 27, 2024

    @Fidget-Spinner
    Fidget-Spinner
    on Jun 27, 2024
    Member

    @skirpichev @sobolevn that test is flaky. for example, after 22b0de2, 6f7acaa passed perfectly fine.

  4. Fidget-Spinner commented on Jun 27, 2024

    @Fidget-Spinner
    Fidget-Spinner
    on Jun 27, 2024
    Member

    Another example: #121083 came after that commit, and still passes that test.

  5. vstinner commented on Jun 27, 2024

    @vstinner
    vstinner
    on Jun 27, 2024
    Member

    Maybe we can reduce the number of signals sent, or increase the recursion limit.

  6. colesbury commented on Jun 27, 2024

    @colesbury
    colesbury
    on Jun 27, 2024
    Contributor

    Let's disable the test for now and then investigate the root cause.

  7. colesbury
    added 2 commits that reference this issue on Jun 27, 2024

    pythongh-121065: Temporarily skip flaky test on free-threaded build

    70bbf64

    gh-121065: Temporarily skip flaky test on free-threaded build (#121100)

    4a62a33
  8. mrahtz
    added a commit that references this issue on Jun 30, 2024

    pythongh-121065: Temporarily skip flaky test on free-threaded build (p…

    06fd901
  9. noahbkim
    added a commit that references this issue on Jul 11, 2024

    pythongh-121065: Temporarily skip flaky test on free-threaded build (p…

    b6e2746
  10. estyxx
    added a commit that references this issue on Jul 17, 2024

    pythongh-121065: Temporarily skip flaky test on free-threaded build (p…

    6534d15
  11. kumaraditya303
    marked 3.13.0b1 freethreading-debug build: flaky test_signal.test_stress_modifying_handlers on s390x (RecursionError) #118989 as a duplicate of this issue on May 17, 2025

  12. befeleme commented on Jan 16, 2026

    @befeleme
    befeleme
    on Jan 16, 2026
    Contributor

    We have experienced this issue in Fedora Linux in the past, but haven't seen this happening in Python 3.15.0~a2, a3 or a5.

  13. vstinner commented on Jan 19, 2026

    @vstinner
    vstinner
    on Jan 19, 2026
    Member

    The test is skipped on Free Threaded builds for 1 year 1/2.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Metadata

Metadata

Assignees

No one assigned

    Labels

    testsTests in the Lib/test dirtopic-free-threadingtype-bugAn unexpected behavior, bug, or error

    Projects

    No projects

      Milestone

      No milestone

      Relationships

      None yet

      Development

      No branches or pull requests

      Issue actions