[GHC] #8298: +RTS -hb crash when blocking on empty TChan

[GHC]

#8298: +RTS -hb crash when blocking on empty TChan
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        Reporter:         |            Owner:
  exFalso                 |           Status:  new
            Type:  bug    |        Milestone:
        Priority:         |          Version:  7.6.3
  normal                  |         Keywords:  biographical stm tchan block
       Component:         |     Architecture:  x86_64 (amd64)
  Runtime System          |       Difficulty:  Unknown
      Resolution:         |       Blocked By:  8275
Operating System:  Linux  |  Related Tickets:
 Type of failure:         |
  Runtime crash           |
       Test Case:         |
        Blocking:         |
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Comment (by simonmar):

 I fixed a bug in `-hb` recently:
 83be3d7b8881eca63adf834e425e6799e572bd1f/ghc

 I haven't tested this example though, it might be that there are more bugs
 to find.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8298#comment:4>
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