With zsh 5.0.7 (Debian package), I did a tab-completion, which
generated endless output (I don't know why, and I don't remember the
command). I typed Ctrl-\ to interrupt it (Ctrl-C had no effect), but
zsh immediately crashed (the terminal disappeared as a consequence).
Unfortunately it didn't leave a core file.

I've attached the file containing my completion settings, which is
sourced by my .zshrc file.

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)