Internal error: resurrectThreads: thread blocked in a strange way: 10

When running this example program:

https://gist.github.com/nh2/0c68650b78b692e5f827#file-forkprocess-problem-hs

I get the error:

% ghc --make -O forkProcess-problem.hs -threaded && ./forkProcess-problem +RTS -N8
[1 of 1] Compiling Main ( forkProcess-problem.hs, forkProcess-problem.o )
Linking forkProcess-problem ...
forkProcess-problem: internal error: resurrectThreads: thread blocked in a strange way: 10
(GHC version 7.8.3 for x86_64_unknown_linux)
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug

Also happens for GHC 7.6.3. My machines are Ubuntu 12.04 and 14.04.

Trac metadata

Trac field	Value
Version	7.8.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Runtime System
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	edsko, simonmar
Operating system
Architecture