AMD64 Fedora Rawhide 3.x:
https://buildbot.python.org/all/#/builders/285/builds/685

It is likely test_itimer_virtual() of test_signal which failed.

On the buildbot worker:

$ rpm -q glibc
glibc-2.34.9000-5.fc36.x86_64
$ uname -r
5.15.0-0.rc0.20210902git4ac6d90867a4.4.fc36.x86_64

test.pythoninfo:

platform.libc_ver: glibc 2.34.9000
platform.platform: Linux-5.15.0-0.rc0.20210902git4ac6d90867a4.4.fc36.x86_64-x86_64-with-glibc2.34.9000

Logs:

test test_signal crashed -- Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-x86_64/build/Lib/test/libregrtest/runtest.py", line 340, in _runtest_inner
    refleak = _runtest_inner2(ns, test_name)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-x86_64/build/Lib/test/libregrtest/runtest.py", line 297, in _runtest_inner2
    test_runner()
    ^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-x86_64/build/Lib/test/libregrtest/runtest.py", line 261, in _test_module
    support.run_unittest(tests)
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-x86_64/build/Lib/test/support/__init__.py", line 1123, in run_unittest
    _run_suite(suite)
    ^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-x86_64/build/Lib/test/support/__init__.py", line 998, in _run_suite
    result = runner.run(suite)
             ^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-x86_64/build/Lib/unittest/runner.py", line 176, in run
    test(result)
    ^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-x86_64/build/Lib/unittest/suite.py", line 84, in __call__
    return self.run(*args, **kwds)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-x86_64/build/Lib/unittest/suite.py", line 122, in run
    test(result)
    ^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-x86_64/build/Lib/unittest/suite.py", line 84, in __call__
    return self.run(*args, **kwds)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-x86_64/build/Lib/unittest/suite.py", line 122, in run
    test(result)
    ^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-x86_64/build/Lib/unittest/suite.py", line 84, in __call__
    return self.run(*args, **kwds)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-x86_64/build/Lib/unittest/suite.py", line 122, in run
    test(result)
    ^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-x86_64/build/Lib/unittest/case.py", line 652, in __call__
    return self.run(*args, **kwds)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-x86_64/build/Lib/unittest/case.py", line 569, in run
    result.startTest(self)
    ^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-x86_64/build/Lib/test/support/testresult.py", line 41, in startTest
    super().startTest(test)
    ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-x86_64/build/Lib/unittest/runner.py", line 54, in startTest
    self.stream.write(self.getDescription(test))
                      ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-x86_64/build/Lib/unittest/runner.py", line 44, in getDescription
    def getDescription(self, test):
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-rawhide-x86_64/build/Lib/test/test_signal.py", line 739, in sig_vtalrm
    raise signal.ItimerError("setitimer didn't disable ITIMER_VIRTUAL "
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
signal.itimer_error: setitimer didn't disable ITIMER_VIRTUAL timer.


Code of the test:

    def sig_vtalrm(self, *args):
        self.hndl_called = True

        if self.hndl_count > 3:
            # it shouldn't be here, because it should have been disabled.
            raise signal.ItimerError("setitimer didn't disable ITIMER_VIRTUAL "  # <==== HERE
                "timer.")     # <======================================================= HERE
        elif self.hndl_count == 3:
            # disable ITIMER_VIRTUAL, this function shouldn't be called anymore
            signal.setitimer(signal.ITIMER_VIRTUAL, 0)

        self.hndl_count += 1

    # Issue 3864, unknown if this affects earlier versions of freebsd also                
    @unittest.skipIf(sys.platform in ('netbsd5',),                                        
        'itimer not reliable (does not mix well with threading) on some BSDs.')           
    def test_itimer_virtual(self):                                                        
        self.itimer = signal.ITIMER_VIRTUAL
        signal.signal(signal.SIGVTALRM, self.sig_vtalrm)
        signal.setitimer(self.itimer, 0.3, 0.2)

        start_time = time.monotonic()
        while time.monotonic() - start_time < 60.0:
            # use up some virtual time by doing real work
            _ = pow(12345, 67890, 10000019)
            if signal.getitimer(self.itimer) == (0.0, 0.0):
                break # sig_vtalrm handler stopped this itimer
        else: # Issue 8424
            self.skipTest("timeout: likely cause: machine too slow or load too "
                          "high")

        # virtual itimer should be (0.0, 0.0) now
        self.assertEqual(signal.getitimer(self.itimer), (0.0, 0.0))
        # and the handler should have been called
        self.assertEqual(self.hndl_called, True)