[GHC] #9555: internal error: ARR_WORDS object entered!

[GHC]

#9555: internal error: ARR_WORDS object entered!
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              Reporter:  walck       |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.8.3
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  x86_64 (amd64)
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by slyfox):

 I've managed to reproduce it!

 I think the problem arises due to '''arithmoi''' being alone package built
 with ghc -fllvm.
 It should not break, but llvm is a bit experimental target (maybe
 upgrading '''llvm''' version will help, dunno).

 To workaround it you can buiild arithmoi w/o llvm flag:
 {{{
     cabal install cyclotomic arithmoi -f-llvm --reinstall
 }}}

 The steps to reproduce:
 {{{
     # get saucy
     mkdir saucy
     debootstrap saucy saucy/ https://mirrors.kernel.org/ubuntu/
     chroot saucy/
     echo 'deb http://archive.ubuntu.com/ubuntu saucy main universe' >
 /etc/apt/sources.list

     apt-get update
     apt-get install ghc cabal-install ncurses-dev build-essential llvm

     # unpack ghc, ./configure && make

     # get latest cabal
     cabal update
     cabal install cabal-install

     # get arithmoi
     ~/.cabal/bin/cabal install --with-compiler=$(pwd)/inplace/bin/ghc-
 stage2 cyclotomic

     # reproduce
     root at sf:~/ghc-7.8.3# inplace/bin/ghc-stage2 -e
 'Data.Complex.Cyclotomic.goldenRatio'
 <interactive>: internal error: ARR_WORDS object entered!
     (GHC version 7.8.3 for x86_64_unknown_linux)
     Please report this as a GHC bug:
 http://www.haskell.org/ghc/reportabug
 Aborted
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9555#comment:6>
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