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Russ Cox authored
The case can happen when starttheworld is calling acquirep to get things moving again and acquirep gets preempted. The stack trace is in golang.org/issue/6644. It is difficult to build a short test case for this, but the person who reported issue 6644 confirms that this solves the problem. Fixes #6644. R=golang-dev, r CC=golang-dev https://golang.org/cl/18740044
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