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Waiting for asyncio.StreamWriter.drain() twice in parallel raises an AssertionError when the transport stopped writing #74116

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@metathink
mannequin
BPO 29930
Nosy @vstinner, @cjerdonek, @socketpair, @1st1, @RemiCardona, @jnwatson, @CallumQuick
Files
  • server.py
  • client.py
  • drain_multiple_waiters.patch
  • 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 2017-03-28.09:45:54.697> labels = ['type-bug', 'expert-asyncio'] title = 'Waiting for asyncio.StreamWriter.drain() twice in parallel raises an AssertionError when the transport stopped writing' updated_at = <Date 2019-11-04.15:20:53.898> user = 'https://bugs.python.org/metathink'

    bugs.python.org fields:

    activity = <Date 2019-11-04.15:20:53.898> actor = 'callumquick' assignee = 'none' closed = False closed_date = None closer = None components = ['asyncio'] creation = <Date 2017-03-28.09:45:54.697> creator = 'metathink' dependencies = [] files = ['46761', '46762', '46763'] hgrepos = [] issue_num = 29930 keywords = ['patch'] message_count = 11.0 messages = ['290690', '290702', '290703', '290704', '290706', '290732', '290760', '290773', '298981', '301767', '355951'] nosy_count = 9.0 nosy_names = ['vstinner', 'chris.jerdonek', 'socketpair', 'aymeric.augustin', 'yselivanov', 'RemiCardona', 'jnwatson', 'metathink', 'callumquick'] pr_nums = [] priority = 'normal' resolution = None stage = None status = 'open' superseder = None type = 'behavior' url = 'https://bugs.python.org/issue29930' versions = ['Python 3.6']

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    3.10only security fixes3.11only security fixes3.12only security fixestopic-asynciotype-bugAn unexpected behavior, bug, or error

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