The source.squeak.org server got stuck on a Mutex again.  Here's a
picture of the waiting processes on the server, along with an
inspector on the Mutex.

Back when Mutex was pure Smalltalk if this happened I could just
signal its internal Semaphore and off it would go, delayed processes
would eventually run.  But it's all hidden in the VM now, so the only
viable thing I can do is restart the image.
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