[GHC] #11978: running a profiled build of shake test suite with rts args +RTS -hb -N10 triggers SIGSEGV

[GHC]

#11978: running a profiled build of shake test suite with rts args  +RTS -hb -N10
triggers SIGSEGV
---------------------------------+----------------------------------------
        Reporter:  carter        |                Owner:
            Type:  bug           |               Status:  new
        Priority:  highest       |            Milestone:
       Component:  Compiler      |              Version:  8.0.1
      Resolution:                |             Keywords:
Operating System:  MacOS X       |         Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:  #4820         |  Differential Rev(s):
       Wiki Page:                |
---------------------------------+----------------------------------------

Comment (by erikd):

 Replying to [comment:3 carter]:
 > found a simple reproducer for the sigsevg
 > {{{
 > echo "main = putStrLn \"hii\"" > main.hs
 > ghc -prof -rtsopts  -threaded main.hs
 > ./main  +RTS -hb -N10
 > hii
 > fish: './main  +RTS -hb -N10' terminated by signal SIGSEGV
 >
 > }}}

 Can confirm that with the the same thing happens on linux with
 `ghc-7.10.3` and `ghc-8.0.0.20160421`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11978#comment:5>
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