Cannot escape from a black hole in ghci 6.10.1

[Ahn, Ki Yung]

Dear GHC users

I have both GHC 6.8.2 (debian unstable package) and
GHC 6.8.10 (binary distribution from ghc homepage) installed.

I was able to escape from a black hole in ghci 6.8.2 with Ctrl-C.
For example,

GHCi, version 6.8.2: http://www.haskell.org/ghc/  :? for help
Loading package base ... linking ... done.
Prelude> let x = x + x
Prelude> x
^CInterrupted.
Prelude> x
*** Exception: stack overflow
Prelude>

Interestingly, you will get a stack overflow when you try to escape from
the black home for the second time.

In ghci 6.10.1, I am not able to escape from a black hole with Ctrl-C.

GHCi, version 6.10.1: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer ... linking ... done.
Loading package base ... linking ... done.
Prelude> let x = x + x
Prelude> x
^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C ... (doesn't work)

You can't escape from the black hole and ghci will start
eating up your memory unless kill the ghci process.
Now the black hole behaves like a real black hole :-)

Is this a ticketed bug, or should we make a new ticket?

--
  Ahn, Ki Yung