Ahn, Ki Yung wrote:

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?

Yes, this is the same bug as #2783 (fixed yesterday) and probably also #2780 (I still have to test the fix against that program). It'll be fixed in 6.10.2. Cheers, Simon