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From: Karl Dahlke <eklhad@comcast.net>
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Subject: [PATCH 3.12] Broken terminal due to echo bufferring
Date: Tue, 10 Dec 2013 05:52:32 -0500
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Just a followup to my last post.
You don't need to compile the write("prompt>") program to see the bug.
Just edit a modest text file with /bin/ed, which runs in cooked mode.
As soon as the file comes up, hit ^c.
Lots of old stuff comes spewing out.
Eventually the tty is back and you can edit the file as usual, or quit.

Karl Dahlke