T12877 intermittently fails

I recently ran a validate where this failed:

bytes allocated value is too high:
    Expected    T12877(normal) bytes allocated: 135979000 +/-5%
    Lower bound T12877(normal) bytes allocated: 129180050·
    Upper bound T12877(normal) bytes allocated: 142777950·
    Actual      T12877(normal) bytes allocated: 143317872·
    Deviation   T12877(normal) bytes allocated:       5.4 %
*** unexpected stat test failure for T12877(normal)

When I reran the test by itself, it passed.

Trac metadata

Trac field	Value
Version	8.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	low
Resolution	Unresolved
Component	Test Suite
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