[GHC] #9306: Crash when shifting Integers too much

13 Jul 2014

      #9306: Crash when shifting Integers too much
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       Reporter:  dfeuer            |             Owner:
           Type:  bug               |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  libraries/base    |           Version:  7.8.3
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  Runtime crash
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 When shifting an Integer by `fromIntegral (maxBound::Int) + 2` or more,
 the RTS crashes. The attached program gives the following output (on
 x86_64, at least):

 [dfeuer@lemur src]$ ./shiftcrash
 Okay 0
 gmp: overflow in mpz type
 Aborted

 I found the bug in 7.6.3, but it's been verified to be present also in
 7.8.3. The crash also occurs when running similar code in GHCi.

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Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9306
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