[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:  merge
        Priority:  low               |            Milestone:  8.2.1
       Component:  Core Libraries    |              Version:  8.0.1
      Resolution:                    |             Keywords:
                                     |  setNumCapabilities
Operating System:  Linux             |         Architecture:  x86
 Type of failure:  Runtime crash     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Description changed by bgamari:

@@ -0,0 +1,1 @@
+ {{{
@@ -9,0 +10,1 @@
+ }}}

New description:

 {{{
 > 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#comment:3>
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