[GHC] #8093: Runtime Internal Error with setNumCapabilities 1

[GHC]

#8093: Runtime Internal Error with setNumCapabilities 1
----------------------------------+----------------------------------
       Reporter:  guest           |             Owner:
           Type:  bug             |            Status:  new
       Priority:  normal          |         Milestone:
      Component:  Runtime System  |           Version:  7.6.3
       Keywords:                  |  Operating System:  MacOS X
   Architecture:  x86             |   Type of failure:  Runtime crash
     Difficulty:  Unknown         |         Test Case:
     Blocked By:                  |          Blocking:
Related Tickets:                  |
----------------------------------+----------------------------------
 On the HP 2013.2.0.0 on OS X 10.6, a program running a worker thread
 started with ForkIO and communicating over MVars crashes on exit with this
 error message:

 out: internal error: stg_ap_p_ret
     (GHC version 7.6.3 for i386_apple_darwin)
     Please report this as a GHC bug:
 http://www.haskell.org/ghc/reportabug

 Only with setNumCapabilities 1, though. Works fine with the systems actual
 core count (>1).

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8093>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler