python / python/cpython

"RuntimeError: release unlocked lock" when starting a thread

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Description

BPO 34486
Nosy @pitrou, @vstinner, @serhiy-storchaka, @zhangyangyu, @skonieczny, @hongweipeng, @maggyero, @vladima
Files
  • start_threads.py
  • test.sh
  • cond_race.py
  • 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 = None
    created_at = <Date 2018-08-24.14:02:35.204>
    labels = ['library']
    title = '"RuntimeError: release unlocked lock" when starting a thread'
    updated_at = <Date 2022-02-03.17:42:54.731>
    user = 'https://github.com/skonieczny'
    

    bugs.python.org fields:

    activity = <Date 2022-02-03.17:42:54.731>
    actor = 'maggyero'
    assignee = 'none'
    closed = False
    closed_date = None
    closer = None
    components = ['Library (Lib)']
    creation = <Date 2018-08-24.14:02:35.204>
    creator = 'uosiu'
    dependencies = []
    files = ['47761', '47762', '47765']
    hgrepos = []
    issue_num = 34486
    keywords = []
    message_count = 10.0
    messages = ['323998', '323999', '324170', '324490', '324655', '324785', '324891', '324893', '324896', '336070']
    nosy_count = 9.0
    nosy_names = ['pitrou', 'vstinner', 'serhiy.storchaka', 'xiang.zhang', 'uosiu', 'hongweipeng', 'maggyero', 'v2m', 'radek_kujawa']
    pr_nums = []
    priority = 'normal'
    resolution = None
    stage = None
    status = 'open'
    superseder = None
    type = None
    url = 'https://bugs.python.org/issue34486'
    versions = ['Python 3.6']
    

    Contributor guide

    Open the contributing guide

    First steps

    1. Read the whole issue, then the project's contributing guide.
    2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
    3. Fork the repository and make your change on a branch.
    4. Open a pull request that references the issue number.

    Research direction

    Start by running test.sh with the reproducer in start_threads.py, then compare its behavior with cond_race.py. Trace the reported unlocked-lock failure through Python's threading behavior and define completion as a reliable reproduction followed by a regression test that no longer raises the RuntimeError.

    Written by the indexing model from the issue text.

    Assessment

    Tech stack
    python
    Domain
    operating-systems
    Issue type
    Bug
    Difficulty
    4/5
    Estimated time
    3-5 days
    Activity status
    Stale
    Clarity
    Needs clarification
    Newbie friendliness
    32/100

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