[PATCH][BZ #20973] Robust mutexes: Fix lost wake-up.

[Torvald Riegel]

On Thu, 2016-12-15 at 23:27 +0100, Torvald Riegel wrote:
> See patch for a description.
> 
> Tested on x86_64-linux with our tests and the test case from the
> original bug report: https://bugzilla.redhat.com/show_bug.cgi?id=1401665
> 
> OK?

Now with an attached patch...
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