Analyse following RPM build log snippet. Describe contents accurately, without speculation or suggestions for resolution.            
Your analysis must be as concise as possible, while keeping relevant information intact.
Snippet: 
=================================== 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.