Stress test break reading content back from ReFS CoW link

[erikmav]

Sporadic failure. Occurs in either the 32 or 64 bit test suites. One interesting data point is that the test failure seems to occur on a test iteration that is a multiple of 510 (test510, test1020 seen in practice).

Test method Microsoft.CopyOnWrite.Tests.CopyOnWriteTests_Windows.ReFSPositiveDetectionAndCloneFileCorrectBehavior threw exception:
System.AggregateException: One or more errors occurred. (Assert.AreEqual failed. Expected:<1234abcd>. Actual:<\0\0\0\0\0\0\0\0>. B:\Stress1\test510) ---> Microsoft.VisualStudio.TestTools.UnitTesting.AssertFailedException: Assert.AreEqual failed. Expected:<1234abcd>. Actual:<\0\0\0\0\0\0\0\0>. B:\Stress1\test510

Stack Trace: 
<>c__DisplayClass10_1.b__0(Int32 i) line 241
<>c__DisplayClass19_01.<ForWorker>b__1(RangeWorker& currentWorker, Int32 timeout, Boolean& replicationDelegateYieldedBeforeCompletion) --- End of stack trace from previous location --- <>c__DisplayClass19_01.b__1(RangeWorker& currentWorker, Int32 timeout, Boolean& replicationDelegateYieldedBeforeCompletion)
Replica.Execute()
--- End of inner exception stack trace ---
TaskReplicator.Run[TState](ReplicatableUserAction1 action, ParallelOptions options, Boolean stopOnFirstFailure) Parallel.ForWorker[TLocal](Int32 fromInclusive, Int32 toExclusive, ParallelOptions parallelOptions, Action1 body, Action2 bodyWithState, Func4 bodyWithLocal, Func1 localInit, Action1 localFinally)
--- End of stack trace from previous location ---
Parallel.ThrowSingleCancellationExceptionOrOtherException(ICollection exceptions, CancellationToken cancelToken, Exception otherException)
Parallel.ForWorker[TLocal](Int32 fromInclusive, Int32 toExclusive, ParallelOptions parallelOptions, Action1 body, Action2 bodyWithState, Func4 bodyWithLocal, Func1 localInit, Action1 localFinally) Parallel.For(Int32 fromInclusive, Int32 toExclusive, Action1 body)
CopyOnWriteTests_Windows.StressTestCloning(String refsRoot) line 239
CopyOnWriteTests_Windows.ReFSPositiveDetectionAndCloneFileCorrectBehavior() line 157
CopyOnWriteTests_Windows.ReFSPositiveDetectionAndCloneFileCorrectBehavior() line 157
ThreadOperations.ExecuteWithAbortSafety(Action action)

Standard Output: 
Creating file with size 2147484672
Running parallel stress test for 8175 CoW links
Running parallel stress test for 8175 CoW links

[erikmav]

Fixed with #6