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The thief loop exited on the first steal_front() == 0: If the thief gets a momentary 0 (e.g., between block transitions before the owner has granted a new block), it exits permanently. The owner then spinned forever on a full queue with no thief to drain it.
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The thief loop exited on the first steal_front() == 0:
If the thief gets a momentary 0 (e.g., between block transitions before the owner has granted a new block), it exits permanently. The owner then spinned forever on a full queue with no thief to drain it.