[GHC] #13832: No parameter-validation in Control.Concurrent.setNumCapabilities

[GHC]

#13832: No parameter-validation in Control.Concurrent.setNumCapabilities
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           Reporter:  AlistairWard   |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  low            |         Milestone:
          Component:  Core           |           Version:  8.0.1
  Libraries                          |
           Keywords:                 |  Operating System:  Linux
  setNumCapabilities                 |
       Architecture:  x86            |   Type of failure:  Runtime crash
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 > ghci
 GHCi, version 7.6.3: http://www.haskell.org/ghc/  :? for help
 Loading package ghc-prim ... linking ... done.
 Loading package integer-gmp ... linking ... done.
 Loading package base ... linking ... done.
 Prelude> Control.Concurrent.setNumCapabilities $ negate 1
 malloc: failed on request for 18446744073709551104 bytes; message:
 moreCapabilities

 The parameter is forwarded to the underlying C-function without
 validation, the runtime then crashes; no exception is thrown.
 This behaviour also exists in ghc 8.0.2

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13832>
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