longstanding bug in sem.c

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Hi Alan and Linus,

We have a longstanding bug in the semaphore handling. This leads to
lost wakeups of sleeping processes and under certain circumstances to
deadlocks.

The appended patches should fix this.

Greetings
                Christoph

• multipart/mixed attachment: patch against 2.2

• multipart/mixed attachment: patch against 2.3

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