[GHC] #9148: tryReadMVar locks up the process with +RTS -N2 or greater

[GHC]

#9148: tryReadMVar locks up the process with +RTS -N2 or greater
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       Reporter:  simonmar          |             Owner:  simonmar
           Type:  bug               |            Status:  new
       Priority:  highest           |         Milestone:  7.8.3
      Component:  Runtime System    |           Version:  7.8.2
       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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 The new `tryReadMVar` is missing an `unlockClosure` call, which causes the
 whole process to hang when used with +RTS -N2 or greater.  I'll push the
 fix shortly.  We should treat this as a blocker for 7.8.3.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9148>
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