test_socket: testStream() fails on Fedora Rawhide

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Example of failure: https://buildbot.python.org/all/#/builders/536/builds/7175

======================================================================
ERROR: testStream (test.test_socket.ThreadedVSOCKSocketStreamTest.testStream)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-aarch64/build/Lib/test/test_socket.py", line 395, in _setUp
    self.__setUp()
    ~~~~~~~~~~~~^^
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-aarch64/build/Lib/test/test_socket.py", line 538, in setUp
    self.conn, self.connaddr = self.serv.accept()
                               ~~~~~~~~~~~~~~~~^^
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-aarch64/build/Lib/socket.py", line 295, in accept
    fd, addr = self._accept()
               ~~~~~~~~~~~~^^
TimeoutError: timed out

======================================================================
ERROR: testStream (test.test_socket.ThreadedVSOCKSocketStreamTest.testStream)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-aarch64/build/Lib/test/test_socket.py", line 383, in raise_queued_exception
    raise self.queue.get()
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-aarch64/build/Lib/test/test_socket.py", line 407, in clientRun
    self.clientSetUp()
    ~~~~~~~~~~~~~~~~^^
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-aarch64/build/Lib/test/test_socket.py", line 546, in clientSetUp
    self.cli.connect((cid, VSOCKPORT))
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
OSError: [Errno 19] No such device

Linked PRs

• gh-119461: Skip ThreadedVSOCKSocketStreamTest if cid is VMADDR_CID_ANY #119463
• gh-119461: Fix ThreadedVSOCKSocketStreamTest #119465
• [3.13] gh-119461: Fix ThreadedVSOCKSocketStreamTest (#119465) #119479
• [3.12] [3.13] gh-119461: Fix ThreadedVSOCKSocketStreamTest (GH-119465) (GH-119479) #119484
• [3.11] gh-119461: Fix ThreadedVSOCKSocketStreamTest #129171
• [3.10] gh-119461: Fix ThreadedVSOCKSocketStreamTest (GH-129171) #129440
• gh-119461: Restore the testSocket VSOCK skipUnless removed by PR #119465 #129561
• [3.13] gh-119461: Restore the testSocket VSOCK skipUnless removed by PR GH-119465 (GH-129561) #129564
• [3.12] gh-119461: Restore the testSocket VSOCK skipUnless removed by PR GH-119465 (GH-129561) #129565
• [3.11] gh-119461: Restore the testSocket VSOCK skipUnless removed by PR GH-119465 (GH-129561) #129566
• [3.9] gh-119461: Fix ThreadedVSOCKSocketStreamTest (GH-129171) (GH-129440) #130075

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It started failing around May 15, 2024.

• First failure on x86-64: https://buildbot.python.org/all/#/builders/339/builds/5314
• Latest success: https://buildbot.python.org/all/#/builders/339/builds/5313

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First failure on x86-64: https://buildbot.python.org/all/#/builders/339/builds/5314
Latest success: https://buildbot.python.org/all/#/builders/339/builds/5313

The kernel was updated between the two builds.

• Before: platform.platform: Linux-6.9.0-0.rc3.20240413git8f2c057754b2.35.fc41.aarch64-aarch64-with-glibc2.39.9000
• After: platform.platform: Linux-6.9.0-64.fc41.aarch64-aarch64-with-glibc2.39.9000

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changes.txt

Package changes the day the build started failing.

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On Fedora Rawhide x86-64 and Linux kernel 6.9.0-64.fc41.x86_64, the device /dev/vsock does exist. get_cid() returns 4294967295 which is VMADDR_CID_ANY (-1).

On Fedora Stable x86-64 and Linux kernel 6.8.10-300.fc40.x86_64, the device /dev/vsock doesn't exist. get_cid() returns None (if fails with OSError).