Fork bomb should throw an exception

When fork bombing (example code below, just run 'f'), a failed forkIO should raise an exception, but on 6.7.20070206 it just brings my system to its knees for a while then sometimes crashes and sometimes I just have to kill it. (printouts included just for the heck of it)

import Control.Concurrent

f = do a <- forkIO g
       b <- forkIO g
       putStrLn $ "f(): Forked a: " ++ (show a) ++ " and b: " ++ (show b)
       return ()

g = do a <- forkIO f
       b <- forkIO f
       putStrLn $ "g(): Forked a: " ++ (show a) ++ " and b: " ++ (show b)
       return ()

Trac metadata

Trac field	Value
Version	6.7
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Runtime System
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture	Unknown