id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,difficulty,testcase,blockedby,blocking,related
4813,Program hangs without -threaded option,mitar,simonmar,"Attached program hangs without `-threaded` option very often (but not always). With `-threaded` it works as it should (exits almost immediately with an exception). As program does not use any FFI and almost none IO I think this is a bug.

I wasn't able to remove use of [http://hackage.haskell.org/package/Etage Etage] but I did simplified it much.

I tried to pin down the problem with debug messages in the library and it seems that although the `SampleVar` (I use to mark that thread has finished) is filled, main thread is still blocked on reading it. I have tested this by printing things before and after writing and reading. So print after writing is seen but reading is still waiting.

I am using 7.1.20101124. Tested both on Mac OS X and Linux amd64.",bug,closed,high,7.0.2,Compiler,7.1,fixed,,mmitar@…,Unknown/Multiple,Unknown/Multiple,None/Unknown,,,,,