Which OS is this happening on?  Several folks have tried this on lots of 
different flavors of Linux and report no problems.

I would argue that any DoS problems are the purview of the the operating 
system, not the shell (or user-land libraries).

Jeff


> we may have to revisit this given enough feedback
> but the upshot is that the seemingly good idea of "no limits" is not always a 
> good idea
> proof of concept: try this with bash on a system that you can reboot with a 
> physical button:
> 
>        bash -c 'read line < /dev/zero'

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