2008653 - mach wpt fails with python 3.14

Status: ASSIGNED

(Testing :: web-platform-tests, defect)

Description

[Emilio Cobos Álvarez [:emilio]]

New python version upgrade, new bustage :)

Running wpt tests locally fails after updating to python 3.14. It works with 3.13 (confirmed by manually downgrading).

$ mach wpt testing/web-platform/tests/css/css-anchor-position/at-position-try-cssom.html
Creating the 'mach' site at /home/emilio/.mozbuild/srcdirs/firefox-4-f84830a4f6ef/_virtualenvs/mach
Creating the 'wpt' site at /home/emilio/.mozbuild/srcdirs/firefox-4-f84830a4f6ef/_virtualenvs/wpt
 0:00.01 INFO Skipping manifest download because existing file is recent
 0:01.51 mozversion INFO application_buildid: 20260106003019
 0:01.51 mozversion INFO application_display_name: Nightly
 0:01.51 mozversion INFO application_id: {ec8030f7-c20a-464f-9b0e-13a3a9e97384}
 0:01.51 mozversion INFO application_name: Firefox
 0:01.51 mozversion INFO application_remotingname: firefox-default
 0:01.51 mozversion INFO application_vendor: Mozilla
 0:01.51 mozversion INFO application_version: 148.0a1
 0:01.51 mozversion INFO platform_buildid: 20260106003019
 0:01.51 mozversion INFO platform_version: 148.0a1
 0:03.00 wptserve INFO Starting http server on http://127.0.0.1:8002
 0:03.00 wptserve INFO Starting http server on http://127.0.0.1:8000
 0:03.00 wptserve INFO Starting http server on http://127.0.0.1:8001
 0:03.00 wptserve INFO Starting http server on http://127.0.0.1:8003
 0:03.01 wptserve INFO Starting https server on https://127.0.0.1:8443
 0:03.01 wptserve INFO Starting https server on https://127.0.0.1:8445
 0:03.01 wptserve INFO Starting https server on https://127.0.0.1:8444
 0:03.01 wptserve INFO Starting https server on https://127.0.0.1:8446
 0:03.01 wptserve INFO Create socket on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 0:03.01 wptserve INFO Bind on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 0:03.01 wptserve INFO Listen on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 0:03.02 wptserve INFO Create socket on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 0:03.02 wptserve INFO Starting http2 server on https://127.0.0.1:9000
 0:03.02 wptserve INFO Bind on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 0:03.02 wptserve INFO Listen on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 0:03.04 wptserve INFO Stopped http server on 127.0.0.1:8000
 0:03.04 wptserve INFO Stopped http server on 127.0.0.1:8001
 0:03.04 wptserve INFO Stopped http server on 127.0.0.1:8003
 0:03.04 wptserve INFO Stopped http server on 127.0.0.1:8002
 0:03.04 wptserve INFO Stopped http server on 127.0.0.1:8443
 0:03.04 wptserve INFO Stopped http server on 127.0.0.1:8444
 0:03.04 wptserve INFO Stopped http server on 127.0.0.1:8445
 0:03.04 wptserve INFO Stopped http server on 127.0.0.1:8446
 0:03.04 wptserve INFO Stopped http server on 127.0.0.1:9000
 0:03.08 wptserve INFO Starting WebTransport over HTTP/3 server on 127.0.0.1:11000
/home/emilio/src/moz/firefox-4/testing/web-platform/tests/tools/webtransport/h3/webtransport_h3_server.py:589: RuntimeWarning: coroutine 'WebTransportH3Server._stop_on_server_thread' was never awaited
  self.loop)
RuntimeWarning: Enable tracemalloc to get the object allocation traceback
Process webtransport-h3 on port 11000:
 0:03.12 wptserve CRITICAL Traceback (most recent call last):
  File "/home/emilio/src/moz/firefox-4/testing/web-platform/tests/tools/serve/serve.py", line 911, in create_daemon
    self.daemon.stop()
    ~~~~~~~~~~~~~~~~^^
  File "/home/emilio/src/moz/firefox-4/testing/web-platform/tests/tools/webtransport/h3/webtransport_h3_server.py", line 589, in stop
    self.loop)
    ^^^^^^^^^
AttributeError: 'WebTransportH3Server' object has no attribute 'loop'

Traceback (most recent call last):
  File "/usr/lib/python3.14/multiprocessing/process.py", line 320, in _bootstrap
    self.run()
    ~~~~~~~~^^
  File "/usr/lib/python3.14/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/emilio/src/moz/firefox-4/testing/web-platform/tests/tools/serve/serve.py", line 911, in create_daemon
    self.daemon.stop()
    ~~~~~~~~~~~~~~~~^^
  File "/home/emilio/src/moz/firefox-4/testing/web-platform/tests/tools/webtransport/h3/webtransport_h3_server.py", line 589, in stop
    self.loop)
    ^^^^^^^^^
AttributeError: 'WebTransportH3Server' object has no attribute 'loop'
 0:03.50 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 0:03.51 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 0:03.59 INFO Closing logging queue
 0:03.59 INFO queue closed
Error running mach:

    mach wpt testing/web-platform/tests/css/css-anchor-position/at-position-try-cssom.html

The error occurred in code that was called by the mach command. This is either
a bug in the called code itself or in the way that mach is calling it.
You can invoke ``./mach busted`` to check if this issue is already on file. If it
isn't, please use ``./mach busted file wpt`` to report it. If ``./mach busted`` is
misbehaving, you can also inspect the dependencies of bug 1543241.

If filing a bug, please include the full output of mach, including this error
message.

The details of the failure are as follows:

Traceback (most recent call last):
  File "/home/emilio/src/moz/firefox-4/python/mach/mach/main.py", line 390, in _run
    return Registrar._run_command_handler(
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        handler,
        ^^^^^^^^
    ...<4 lines>...
        **vars(args.command_args),
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/home/emilio/src/moz/firefox-4/python/mach/mach/registrar.py", line 124, in _run_command_handler
    result = fn(instance, **kwargs)
  File "/home/emilio/src/moz/firefox-4/testing/web-platform/mach_commands.py", line 540, in run_wpt
    return run_web_platform_tests(command_context, **params)
  File "/home/emilio/src/moz/firefox-4/testing/web-platform/mach_commands.py", line 528, in run_web_platform_tests
    return wpt_runner.run(logger, **params)
           ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/home/emilio/src/moz/firefox-4/testing/web-platform/mach_commands_base.py", line 81, in run
    result = wptrunner.start(**kwargs)
  File "/home/emilio/src/moz/firefox-4/testing/web-platform/tests/tools/wptrunner/wptrunner/wptrunner.py", line 591, in start
    rv = int(not run_tests(**kwargs)[0])
                 ~~~~~~~~~^^^^^^^^^^
  File "/home/emilio/src/moz/firefox-4/testing/web-platform/tests/tools/wptrunner/wptrunner/wptrunner.py", line 486, in run_tests
    test_environment.ensure_started()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/home/emilio/src/moz/firefox-4/testing/web-platform/tests/tools/wptrunner/wptrunner/environment.py", line 295, in ensure_started
    failed, pending = self.test_servers()
                      ~~~~~~~~~~~~~~~~~^^
  File "/home/emilio/src/moz/firefox-4/testing/web-platform/tests/tools/wptrunner/wptrunner/environment.py", line 324, in test_servers
    if not webtranport_h3_server_is_running(host, port, timeout=5):
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/emilio/src/moz/firefox-4/testing/web-platform/tests/tools/wptrunner/wptrunner/environment.py", line 58, in webtranport_h3_server_is_running
    return server_is_running(host, port, timeout)
  File "/home/emilio/src/moz/firefox-4/testing/web-platform/tests/tools/webtransport/h3/webtransport_h3_server.py", line 604, in server_is_running
    loop = asyncio.get_event_loop()
  File "/usr/lib/python3.14/asyncio/events.py", line 715, in get_event_loop
    raise RuntimeError('There is no current event loop in thread %r.'
                       % threading.current_thread().name)
RuntimeError: There is no current event loop in thread 'MainThread'.

Comment 1

[Emilio Cobos Álvarez [:emilio]]

It seems python 3.14 throws when there's no event loop even in the main thread.

Comment 2

[Emilio Cobos Álvarez [:emilio]]

Attachment: Bug 2008653 - Ensure TestEnvironment creates an event loop. r=jgraham

This works, but I'm not sure this is the right place to do this.

Comment 4

[James Graham [:jgraham]]

I've made a PR upstream with a slightly different change + updating upstream CI to run with 3.14: https://github.com/web-platform-tests/wpt/pull/57004