Control-C fails to kill the process and triggers "convert: Semaphore operation failed (unable to destroy semaphore)". A regular "kill" also fails to terminate it; I have to use kill -9.
I've had this happen in conjunction with a spawning process that took over the whole machine and made it inaccessible, requiring a visit to the server room and force a reset.
Problem on both OS X (Lion) and linux. Similar to bug 3165456, but I don't lose control of the terminal.
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