I periodically manage to lock bash with an errant C-S (that’s <ctrl>+<s> in Emacs-speak). The only way to recover seemed to be kill the shell window (if I was fortunate enough to be in a windowing environment, or in screen).
Hannu Nevalainen posted a solution to this problem to the Cygwin mailing list. The problem relates to the use of C-S and C-Q as the ASCII XOFF and XON flow control characters respectively. Having hit C-S, simply hit C-Q to store the bash session.
It seems that my education is lacking some terminal history!
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