VSOCK test_socket.testStream() fails on aarch64 Fedora Stable 3.x buildbot

[vstinner]

Example: https://buildbot.python.org/#/builders/125/builds/8159

ERROR: testStream (test.test_socket.ThreadedVSOCKSocketStreamTest.testStream)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/var/lib/buildbot/worker/cstratak-fedora-stable-aarch64/3.x.cstratak-fedora-stable-aarch64/build/Lib/test/test_socket.py", line 438, in _setUp
    self.__setUp()
    ~~~~~~~~~~~~^^
  File "/var/lib/buildbot/worker/cstratak-fedora-stable-aarch64/3.x.cstratak-fedora-stable-aarch64/build/Lib/test/test_socket.py", line 581, in setUp
    self.conn, self.connaddr = self.serv.accept()
                               ~~~~~~~~~~~~~~~~^^
  File "/var/lib/buildbot/worker/cstratak-fedora-stable-aarch64/3.x.cstratak-fedora-stable-aarch64/build/Lib/socket.py", line 299, in accept
    fd, addr = self._accept()
               ~~~~~~~~~~~~^^
TimeoutError: timed out

test.pythoninfo:

test_socket.HAVE_SOCKET_VSOCK: True
os.uname: posix.uname_result(sysname='Linux', nodename='fedora', release='6.18.13-200.fc43.aarch64', version='#1 SMP PREEMPT_DYNAMIC Thu Feb 19 18:50:42 UTC 2026', machine='aarch64')
platform.architecture: 64bit ELF
platform.freedesktop_os_release[ID]: fedora
platform.freedesktop_os_release[NAME]: Fedora Linux
platform.freedesktop_os_release[VARIANT_ID]: server
platform.freedesktop_os_release[VERSION]: 43 (Server Edition)
platform.freedesktop_os_release[VERSION_ID]: 43
platform.libc_ver: glibc 2.42
platform.platform: Linux-6.18.13-200.fc43.aarch64-aarch64-with-glibc2.42

[vstinner]

Other Fedora buildbots are affected, examples:

• aarch64 Fedora Rawhide 3.x: https://buildbot.python.org/#/builders/339/builds/6949
• PPC64LE Fedora Rawhide 3.x: https://buildbot.python.org/#/builders/455/builds/7791