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Parser hanging on stacked { tokens #90863

Description

@tonybaloney
BPO 46707
Nosy @tonybaloney, @lysnikolaou, @pablogsal
PRs
  • bpo-46707: Avoid potential exponential backtracking in some syntax errors #31241
  • [3.10] bpo-46707: Avoid potential exponential backtracking in some syntax errors (GH-31241). #31242
  • 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 2022-02-10.03:54:55.013>
    created_at = <Date 2022-02-10.03:00:43.493>
    labels = ['interpreter-core', '3.10', 'type-crash', '3.11']
    title = 'Parser hanging on stacked { tokens'
    updated_at = <Date 2022-02-10.03:55:09.308>
    user = 'https://github.com/tonybaloney'

    bugs.python.org fields:

    activity = <Date 2022-02-10.03:55:09.308>
    actor = 'pablogsal'
    assignee = 'none'
    closed = True
    closed_date = <Date 2022-02-10.03:54:55.013>
    closer = 'pablogsal'
    components = ['Parser']
    creation = <Date 2022-02-10.03:00:43.493>
    creator = 'anthonypjshaw'
    dependencies = []
    files = []
    hgrepos = []
    issue_num = 46707
    keywords = ['patch', '3.10regression']
    message_count = 4.0
    messages = ['412972', '412974', '412975', '412976']
    nosy_count = 3.0
    nosy_names = ['anthonypjshaw', 'lys.nikolaou', 'pablogsal']
    pr_nums = ['31241', '31242']
    priority = 'normal'
    resolution = 'fixed'
    stage = 'resolved'
    status = 'closed'
    superseder = None
    type = 'crash'
    url = 'https://bugs.python.org/issue46707'
    versions = ['Python 3.10', 'Python 3.11']

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      3.10only security fixes3.11only security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)type-crashA hard crash of the interpreter, possibly with a core dump

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