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

Antoine Latter aslatter at gmail.com
Sun Jul 15 00:23:06 CEST 2012

If the MVar was set up prior to the fork, I can imagine things going crazy
trying to use it on the ther side of the fork - especially if their were
waiting readers or writers while the fork was executing.
On Jul 14, 2012 3:01 PM, "Joey Hess" <joey at kitenet.net> wrote:

> 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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