[Haskell-cafe] strange hangs with -threaded runtime (now with test case)

[Joey Hess]

I've isolated the hang further to hPipeFrom's use of System.Log.Logger.
Commenting out calls to logging functions makes it reliably run ok. See
the "LINE OF DEATH" in the attached updated test case.

... And it turns out that System.Log.Logger uses a MVar to hold the
logger information. So I think this points to a MissingH bug, although I
don't yet understand it.

-- 
see shy jo
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