[GHC] #3758: Huge regression in concurrent app performance and reliability under threaded runtime

[GHC]

#3758: Huge regression in concurrent app performance and reliability under
threaded runtime
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  Reporter:  bos             |          Owner:  simonmar      
      Type:  bug             |         Status:  new           
  Priority:  high            |      Milestone:  6.12.2        
 Component:  Runtime System  |        Version:  6.12.1        
Resolution:                  |       Keywords:                
Difficulty:                  |             Os:  Linux         
  Testcase:                  |   Architecture:  x86_64 (amd64)
   Failure:  Runtime crash   |  
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Comment (by bos):

 I only see the deadlocks when running server and client on the same
 machine.  Everything seems reliable when they're physically separate.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3758#comment:10>
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