Not a bug. User stupidity. Unix gives you the rope to hang yourself.
There are several different strategies to recover from this, among
others:
- start another terminal, kill the yes process
- exit the shell
It's creating a detached background process. *Of course* you won’t be
able to use normal job handling on it.
Additionally, your diagnosis is all wrong: The shell does not become
totally unresponsive. In fact, it’s usable just fine, except your
terminal is too slow to keep up with the I/O flood from yes (naturally).
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https://bugs.launchpad.net/bugs/1213743
Title:
subshell that instantly locks up bash, dash, ksh, tcsh, and zsh
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