Given following log snippets, their explanation, and nothing else, explain what failure, if any, occurred during build of this package.

  Snippets are in a format of [X] : [Y], where [X] is a log snippet, and [Y] is the explanation.

  Snippets are delimited with '================'.

  Drawing on information from all snippets, provide a concise explanation of the issue and recommend a solution.

  Explanation of the issue, and recommended solution, should take a handful of sentences.

  Snippets:

  [=================================== FAILURES ===================================
______________________ TestFuzzIsisTLV.test_exit_cleanly _______________________
self = <test_fuzz_isis_tlv.TestFuzzIsisTLV object at 0x7fca727eb820>
    def testfunction(self):
        self._run_tests()
        result = self.testresults[matchfunction]
        if result is not None:
>           frrsix.reraise(*result)
helpers/python/frrtest.py:108: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
helpers/python/frrsix.py:62: in reraise
    raise value
helpers/python/frrtest.py:82: in _run_tests
    test(self)
helpers/python/frrtest.py:100: in matchfunction
    method(self, *args, **kwargs)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
self = <test_fuzz_isis_tlv.TestFuzzIsisTLV object at 0x7fca727eb820>
    def _exit_cleanly(self):
        if self.exitcode != 0:
>           raise MultiTestFailure("Program did not terminate with exit code 0")
E           frrtest.MultiTestFailure: Program did not terminate with exit code 0
helpers/python/frrtest.py:90: MultiTestFailure
----------------------------- Captured stderr call -----------------------------
isis fuzztest: showing active allocations in memory group logging subsystem
isis fuzztest: showing active allocations in memory group libfrr
isis fuzztest: memstats:  Temporary memory              :      2 * (variably sized)
isis fuzztest: showing active allocations in memory group isisd
----- generated xml file: /builddir/build/BUILD/frr-8.5.3/tests/tests.xml ------
=========================== short test summary info ============================
FAILED isisd/test_fuzz_isis_tlv.py::TestFuzzIsisTLV::test_exit_cleanly - frrt...
================== 1 failed, 439 passed, 5 skipped in 47.16s ===================]: [Indication of the result of running upstream unit test of the package.]

Issue: Unit test fails, which blocks the build.
Resolution: It is not clear why the test failed. After discussion with upstream, the test was waived.