Runtime caught in an infinite loop

Triggering this bug seems a little fragile; but the program and method I've attached triggers the bug every time for me. It is minimal-ish, I certainly have cut it down a lot, and it perhaps could be made even smaller, but a lot of seemingly irrelevant changes to the file will fail to trigger the bug.

$ cabal configure && cabal build
$ ./dist/build/deadlock/deadlock

And then edit the file and change the 1 to some other value, like 2. Configurator will reload the file within a second, and then I see that the thread that periodically writes something to standard out stops working, and that CPU usage goes to 100%, and that I can no longer type something in and have the program echo it back to me.

GHC-7.0.3 has no problem running this program.

Trac metadata

Trac field	Value
Version	7.4.1-rc1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Runtime System
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