The "Lost Lock" Race Condition

W

W

W

1

2

3

4

0

W

W

W

W

1

2

3

4

0

Want to Unlock byte 2

1

2

3

4

0

Given:

Unlock 0-4

W

W

2

3

4

0

W

W

Lock 0-1

Lock 3-4

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