[GHC] #7719: System.Timeout.timeout may leak <<timeout>> exceptions

[GHC]

#7719: System.Timeout.timeout may leak <<timeout>> exceptions
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Reporter:  int-e         |          Owner:                
    Type:  bug           |         Status:  new           
Priority:  normal        |      Component:  libraries/base
 Version:  7.7           |       Keywords:                
      Os:  Linux         |   Architecture:  x86_64 (amd64)
 Failure:  None/Unknown  |      Blockedby:                
Blocking:                |        Related:                
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Comment(by int-e):

 Replying to [comment:1 int-e]:
 > (Examples using multiple capabilities running in parallel are easier to
 construct.)

 On second thought, no. Even with multiple capabilities, everything hinges
 on the fact that the {{{killThread}}} targeting the timer threads may
 block. Other than having exceptions masked I see no such possibility.
 (Blocking on black holes is a worrisome option; that is another reason
 (besides performance) why {{{registerTimeout}}} should '''not''' evaluate
 the new timeout queue.)

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7719#comment:4>
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