New submission from STINNER Victor <vstin...@python.org>:

AMD64 FreeBSD Shared 3.8:
https://buildbot.python.org/all/#builders/374/builds/10

This buildbot worker is known to be very slow. It became even slower recently.


ERROR: test_communicate 
(test.test_asyncio.test_subprocess.SubprocessMultiLoopWatcherTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File 
"/usr/home/buildbot/python/3.8.koobs-freebsd-564d/build/Lib/test/test_asyncio/test_subprocess.py",
 line 147, in test_communicate
    exitcode, stdout = self.loop.run_until_complete(task)
  File 
"/usr/home/buildbot/python/3.8.koobs-freebsd-564d/build/Lib/asyncio/base_events.py",
 line 608, in run_until_complete
    return future.result()
  File 
"/usr/home/buildbot/python/3.8.koobs-freebsd-564d/build/Lib/asyncio/tasks.py", 
line 490, in wait_for
    raise exceptions.TimeoutError()
asyncio.exceptions.TimeoutError

Extract of the test:

    def test_communicate(self):
        args = PROGRAM_CAT

        async def run(data):
            proc = await asyncio.create_subprocess_exec(
                *args,
                stdin=subprocess.PIPE,
                stdout=subprocess.PIPE,
            )
            stdout, stderr = await proc.communicate(data)
            return proc.returncode, stdout

        task = run(b'some data')
        task = asyncio.wait_for(task, 60.0)
        exitcode, stdout = self.loop.run_until_complete(task)    # <==== HERE
        self.assertEqual(exitcode, 0)
        self.assertEqual(stdout, b'some data')

It seems like the test has an hardcoded timeout of 1 minute. The first thing 
that we can do is to increase this timeout to 5 minutes.

----------
components: Tests
messages: 355537
nosy: vstinner
priority: normal
severity: normal
status: open
title: test_asyncio: test_communicate() failed on AMD64 FreeBSD Shared 3.8
versions: Python 3.9

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38614>
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