internal error: schedule: invalid what_next field

Test.hs:

import Control.Monad
main = forever $ print $ sum [1 .. 100000]

$ ghc --make Test.hs && ./Test
[1 of 1] Compiling Main             ( Test.hs, Test.o )
Linking Test ...
5000050000
5000050000
5000050000
<snip>
5000050000
5000050000
5000050000
Test: internal error: schedule: invalid what_next field
    (GHC version 6.10.1 for x86_64_unknown_linux)
    Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
Aborted

This only happens when the program is compiled without optimization or -threaded. The number of iterations (~50) before the error changes slightly and seems not to be affected by -H RTS option.

Trac metadata

Trac field	Value
Version	6.10.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Runtime System
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